Journal articles: 'Waveguide resonator'

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Weeber, Jean-Claude, Gérard Colas-des-Francs, Alexandre Bouhelier, Aymeric Leray, Kirill Vasilev, Xiao Yu, Kamal Hammani, et al. "Colloidal quantum dots decorated micro-ring resonators for efficient integrated waveguides excitation." Nanophotonics 9, no. 6 (April 24, 2020): 1411–23. http://dx.doi.org/10.1515/nanoph-2019-0516.

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AbstractMicro-ring resonators made of titanium dioxide were decorated with local light sources comprising CdSe/CdS colloidal quantum dot aggregates. The active micro-resonators are operated to achieve efficient evanescent excitation of nearby co-planar integrated waveguides. Coupled-mode analysis and numerical simulations are used to capture the dynamic of the optical interaction between locally activated resonators and integrated waveguides. In this context, we exemplify the key role of resonator intrinsic loss. Next, we show that locally activated or bus-waveguide excited resonators are in optimum waveguide interaction for the same so-called critical coupling condition, although the physical origin of this property is different for each configuration. More importantly, we found that a locally activated resonator is a fabrication imperfection tolerant configuration for the coupling light of local sources into waveguides. This remarkable property originates from the opposite change of the power cycling into the resonator and the waveguide coupling efficiency as a function of the resonator-waveguide separation gap. By operating an 8-μm-radius ring resonator with loaded quality factors around Q = 2100, we experimentally demonstrate a 5.5-dB enhancement of the power coupled into the output waveguide compared to a direct local source waveguide excitation.

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Kim, Do-Hyun, Su-Jin Jeon, Jae-Sang Lee, Seok-Ho Hong, and Young-Wan Choi. "Novel S-Bend Resonator Based on a Multi-Mode Waveguide with Mode Discrimination for a Refractive Index Sensor." Sensors 19, no. 16 (August 19, 2019): 3600. http://dx.doi.org/10.3390/s19163600.

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In this paper, a multi-mode waveguide-based optical resonator is proposed for an integrated optical refractive index sensor. Conventional optical resonators have been studied for single-mode waveguide-based resonators to enhance the performance, but mass production is limited owing to the high fabrication costs of nano-scale structures. To overcome this problem, we designed an S-bend resonator based on a micro-scale multi-mode waveguide. In general, multi-mode waveguides cannot be utilized as optical resonators, because of a performance degradation resulting from modal dispersion and an output transmission with multi-peaks. Therefore, we exploited the mode discrimination phenomenon using the bending loss, and the resulting S-bend resonator yielded an output transmission without multi-peaks. This phenomenon is utilized to remove higher-order modes efficiently using the difference in the effective refractive index between the higher-order and fundamental modes. As a result, the resonator achieved a Q-factor and sensitivity of 2.3 × 103 and 52 nm/RIU, respectively, using the variational finite-difference time-domain method. These results show that the multi-mode waveguide-based S-bend resonator with a wide line width can be utilized as a refractive index sensor.

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Huang, Yin, Changjun Min, Liu Yang, and Georgios Veronis. "Nanoscale Plasmonic Devices Based on Metal-Dielectric-Metal Stub Resonators." International Journal of Optics 2012 (2012): 1–13. http://dx.doi.org/10.1155/2012/372048.

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We review some of the recent research activities on plasmonic devices based on metal-dielectric-metal (MDM) stub resonators for manipulating light at the nanoscale. We first introduce slow-light subwavelength plasmonic waveguides based on plasmonic analogues of periodically loaded transmission lines and electromagnetically induced transparency. In both cases, the structures consist of a MDM waveguide side-coupled to periodic arrays of MDM stub resonators. We then introduce absorption switches consisting of a MDM plasmonic waveguide side-coupled to a MDM stub resonator filled with an active material.

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Voronin, Kirill V., Yury V. Stebunov, Artem A. Voronov, Aleksey V. Arsenin, and Valentyn S. Volkov. "Vertically Coupled Plasmonic Racetrack Ring Resonator for Biosensor Applications." Sensors 20, no. 1 (December 30, 2019): 203. http://dx.doi.org/10.3390/s20010203.

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Plasmonic chemical and biological sensors offer significant advantages such as really compact sizes and extremely high sensitivity. Biosensors based on plasmonic waveguides and resonators are some of the most attractive candidates for mobile and wearable devices. However, high losses in the metal and complicated schemes for practical implementation make it challenging to find the optimal configuration of a compact plasmon biosensor. Here, we propose a novel plasmonic refractive index sensor based on a metal strip waveguide placed under a waveguide-based racetrack ring resonator made of the same metal. This scheme guarantees effective coupling between the waveguide and resonator and low loss light transmittance through the long-range waveguide. The proposed device can be easily fabricated (e.g., using optical lithography) and integrated with materials like graphene oxide for providing adsorption of the biomolecules on the sensitive part of the optical elements. To analyze the properties of the designed sensing system, we performed numerical simulations along with some analytical estimations. There is one other interesting general feature of this sensing scheme that is worth pointing out before looking at its details. The sensitivity of the considered device can be significantly increased by surrounding the resonator with media of slightly different refractive indices, which allows sensitivity to reach a value of more than 1 μm per refractive index unit.

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Hamidkhani, Mehdi, Rasool Sadeghi, and Mohamadreza Karimi. "Dual-Band High Q-Factor Complementary Split-Ring Resonators Using Substrate Integrated Waveguide Method and Their Applications." Journal of Electrical and Computer Engineering 2019 (September 9, 2019): 1–11. http://dx.doi.org/10.1155/2019/6287970.

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In modern microwave telecommunication systems, especially in low phase noise oscillators, there is a need for resonators with low insertion losses and high Q-factor. More specifically, it is of high interest to design resonators with high group delay. In this paper, three novel dual-band complementary split-ring resonators (CSRRs) featuring high group delay etched on the waveguide surface by using substrate integrated waveguides are investigated and proposed. They are designed for a frequency range of 4.5–5.5 GHz. Group delay rates for the first, second, and third resonators were approximated as much as 23 ns, 293 ns, and 90 ns, respectively. We also proposed a new practical method to develop a wide tuning range SIW CSRR cavity resonator with a small tuning voltage in the second resonator, which leads to about 19% and 1% of tuning frequency band in the first and second bands, respectively. Finally, some of their applications in the design of filter, diplexer, and low phase noise oscillator will be investigated.

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Stefanovski-Pajovic, Snezana, Milka Potrebic, Dejan Tosic, and Zoran Stamenkovic. "E-plane waveguide bandstop filter with double-sided printed-circuit insert." Facta universitatis - series: Electronics and Energetics 30, no. 2 (2017): 223–34. http://dx.doi.org/10.2298/fuee1702223s.

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In this paper a novel design of an E-plane bandstop waveguide filter with a double-sided printed-circuit insert is presented. Split-ring resonators are used as the resonating elements to obtain the bandstop response. The amplitude response of the waveguide resonator with a single resonating element on the insert is analyzed for various dimensions and positions of the split-ring resonator. The coupling between two resonators on the insert, in terms of their mutual distance, is considered as a next step to the filter design. Various positions of the resonators are considered, including the case with the resonators on the different sides of the insert, which is of interest for the proposed filter design. Finally, a third-order bandstop filter with a double-sided printed-circuit insert, operating in the X-frequency band, is introduced. The filter response is analyzed for various distances between the resonators and for various positions of the resonator printed on the other side of the insert. Proposed filter design is simple, providing for the accurate fabrication, miniaturization and possibility to relatively easy obtain multi-band response, using resonators with different resonant frequencies on the different sides of the insert.

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7

Butt, Muhammad Ali ALI, and Nikolay Kazanskiy. "Enhancing the sensitivity of a standard plasmonic MIM square ring resonator by incorporating the Nano-dots in the cavity." Photonics Letters of Poland 12, no. 1 (March 31, 2020): 1. http://dx.doi.org/10.4302/plp.v12i1.902.

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We studied the metal-insulator-metal square ring resonator design incorporated with nano-dots that serve to squeeze the surface plasmon wave in the cavity of the ring. The E-field enhances at the boundaries of the nano-dots providing a strong interaction of light with the surrounding medium. As a result, the sensitivity of the resonator is highly enhanced compared to the standard ring resonator design. The best sensitivity of 907 nm/RIU is obtained by placing seven nano-dots of radius 4 nm in all four sides of the ring with a period (ᴧ)= 3r. The proposed design will find applications in biomedical science as highly refractive index sensors. Full Text: PDF References:Z. Han, S. I. Bozhevolnyi. "Radiation guiding with surface plasmon polaritons", Rep. Prog. Phys. 76, 016402 (2013). [CrossRef]N.L. Kazanskiy, S.N. Khonina, M.A. Butt. "Plasmonic sensors based on Metal-insulator-metal waveguides for refractive index sensing applications: A brief review", Physica E 117, 113798 (2020). [CrossRef]D.K. Gramotnev, S.I. Bozhevolnyi. "Plasmonics beyond the diffraction limit", Nat. Photonics 4, 83 (2010). [CrossRef]A.N.Taheri, H. Kaatuzian. "Design and simulation of a nanoscale electro-plasmonic 1 × 2 switch based on asymmetric metal–insulator–metal stub filters", Applied Optics 53, 28 (2014). [CrossRef]P. Neutens, L. Lagae, G. Borghs, P. V. Dorpe. "Plasmon filters and resonators in metal-insulator-metal waveguides", Optics Express 20, 4 (2012). [CrossRef]M.A. Butt, S.N. Khonina, N. L. Kazanskiy. "Metal-insulator-metal nano square ring resonator for gas sensing applications", Waves in Random and complex media [CrossRef]M.A.Butt, S.N.Khonina, N.L.Kazanskiy. "Hybrid plasmonic waveguide-assisted Metal–Insulator–Metal ring resonator for refractive index sensing", Journal of Modern Optics 65, 1135 (2018). [CrossRef]M.A.Butt, S.N. Khonina, N.L. Kazanskiy, "Highly sensitive refractive index sensor based on hybrid plasmonic waveguide microring resonator", Waves in Random and complex media [CrossRef]Y. Fang, M. Sun. "Nanoplasmonic waveguides: towards applications in integrated nanophotonic circuits", Light:Science & Applications 4, e294 (2015). [CrossRef]H. Lu, G.X. Wang, X.M. Liu. "Manipulation of light in MIM plasmonic waveguide systems", Chin Sci Bull [CrossRef]J.N. Anker et al. "Biosensing with plasmonic nanosensors", Nature Materials 7, 442 (2008). [CrossRef]M.A.Butt, S.N. Khonina, N.L. Kazanskiy. Journal of Modern Optics 66, 1038 (2019).[CrossRef]Z.-D. Zhang, H.-Y. Wang, Z.-Y. Zhang. "Fano Resonance in a Gear-Shaped Nanocavity of the Metal–Insulator–Metal Waveguide", Plasmonics 8,797 (2013) [CrossRef]Y. Yu, J. Si, Y. Ning, M. Sun, X. Deng. Opt. Lett. 42, 187 (2017) [CrossRef]B.H.Zhang, L-L. Wang, H-J. Li et al. "Two kinds of double Fano resonances induced by an asymmetric MIM waveguide structure", J. Opt. 18,065001 (2016) [CrossRef]X. Zhao, Z. Zhang, S. Yan. "Tunable Fano Resonance in Asymmetric MIM Waveguide Structure", Sensors 17, 1494 (2017) [CrossRef]J. Zhou et al. "Transmission and refractive index sensing based on Fano resonance in MIM waveguide-coupled trapezoid cavity", AIP Advances 7, 015020 (2017) [CrossRef]V. Perumal, U. Hashim. "Advances in biosensors: Principle, architecture and applications", J. Appl. Biomed. 12, 1 (2014)[CrossRef]H.Gai, J. Wang , Q. Tian, "Modified Debye model parameters of metals applicable for broadband calculations", Appl. Opt. 46 (12), 2229 (2007) [CrossRef]

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Zhao, Na, Jian She Liu, Hu Zhao, Hao Li, Tie Fu Li, and Wei Chen. "Crosstalk between Nb Superconducting Coplanar Waveguide Resonators." Advanced Materials Research 542-543 (June 2012): 653–58. http://dx.doi.org/10.4028/www.scientific.net/amr.542-543.653.

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Nb based superconducting coplanar waveguide resonators on oxidized silicon wafer were fabricated and characterized at different temperatures. Crosstalk between two single resonators fabricated on the same chip was observed. When microwave signal is sent to the input of either resonator, output from both resonators show almost the same resonant frequency and similar quality factors.

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Skuratovskiy, I., O. Khazov, and A. Shakhova. "A resonant short-circuit plunger as part of tunable waveguide-dielectric and waveguide-coaxial resonators built around cylindrical evanescent waveguides." RADIOFIZIKA I ELEKTRONIKA 26, no. 2 (2021): 46–53. http://dx.doi.org/10.15407/rej2021.02.046.

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Subject and Purpose. Tunable resonant structures make numerous microwave devices, among which are waveguide-dielectric and waveguide-coaxial resonators (WDR and WCR) built around cylindrical evanescent waveguides and involving a resonant short-circuit (RSC) plunger for tuning purposes. The present paper seeks to study specific features of the RSC-plunger operation in the evanescent waveguide and estimate the RSC-plunger efficiency. Method and Methodology. The RSC-plunger efficiency is approximately estimated in terms of the transmission line theory. Comparative experimental verification of the Q-factor increase is provided by an example of a 3 cm WDR resonator equipped with a RSC-plunger. Results. It has been shown that relevant formulae of the transmission line theory can be extended for the RSC-plunger efficiency estimation on the TEM and H11 oscillations. A possibility has been studied of the TEM type transformation to the H11 oscillation and back when the spurious resonance of the RSC-plunger falls within the WDR (WCR) tuning range. Conclusion. Insignificance of the effect that small deviations from the numerically predicted dimensions of the RSC-plunger exert on the RSC-plunger operation efficiency has been demonstrated. The RSC-plunger efficiency and a possibility to remove the spurious resonances from the resonator tuning range have been experimentally confirmed.

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Liu, Chao, Chen Yang Xue, Dan Feng Cui, Jun Bin Zang, Yong Hua Wang, and Jing Xue Wang. "High-Q Silicon-on-Insulator Micro-Ring Resonator with Silica Covering." Advanced Materials Research 684 (April 2013): 443–46. http://dx.doi.org/10.4028/www.scientific.net/amr.684.443.

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We designed High-Q micro-ring resonators based on SOI material. A new method of using a top SiO2 layer to cover the waveguide is applied and the tested Q factor is as high as 1.0135×104. Micro-ring resonator has been fabricated using Electron-Beam Lithography and Inductive Coupled Plasma. OptiFDTD was used to simulate the micro-ring resonator and we compared the transmission spectrum of this resonator with the resonator without SiO2 covering.

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Han, Huangpu, Bingxi Xiang, and Jiali Zhang. "Simulation and Analysis of Single-Mode Microring Resonators in Lithium Niobate Thin Films." Crystals 8, no. 9 (August 24, 2018): 342. http://dx.doi.org/10.3390/cryst8090342.

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The single-mode microring resonators on lithium niobate thin films were designed and simulated using 2.5-D variational finite difference time domain mode simulations from Lumerical mode Solutions. The single-mode conditions and the propagation losses of lithium niobate planar waveguide with different SiO2 cladding layer thicknesses were studied and compared systematically. The optimization of design parameters such as radii of microrings and gap sizes between channel and ring waveguides were determined. The key issues affecting the resonator design such as free spectral range and Quality Factor were discussed. The microring resonators had radius R = 20 μm, and their transmission spectrum had been tuned using the electro-optical effect.

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Mittapalli, Vishwanath, and Habibulla Khan. "Excitation Schemes of Plasmonic Angular Ring Resonator-Based Band-Pass Filters Using a MIM Waveguide." Photonics 6, no. 2 (April 11, 2019): 41. http://dx.doi.org/10.3390/photonics6020041.

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This article describes the analysis and design of the excitation schemes of the plasmonic angular ring resonator-based band-pass filters using a metal-insulator-metal (MIM) waveguide. The excitation schemes of the plasmonic angular ring resonator-based band-pass filters have been analyzed in terms of their physical length by using commercially available electromagnetic full-wave simulation software (CST microwave studio). The excitation schemes of the plasmonic angular ring resonator-based band-pass filter using a MIM waveguide have been realized at the optical O (1260–1360 nm) and U (1625–1675 nm) bands, respectively, as it has dual-band characteristics. The excitation schemes of the plasmonic angular ring resonators have been designed and simulated to determine the variation in transmission and reflection coefficients. The magnetic field distribution of the proposed filters was observed. The ring resonators require low power and had a compact size, which was further used for the development of photonic integrated circuits (PICs). The applications of these resonators are further extended and they are used in the development of antennas, branch line couplers, directional couplers and diplexers.

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Zang, Jun Bin, Chen Yang Xue, Li Ping Wei, Yong Hua Wang, Dan Feng Cui, and Wen Dong Zhang. "Characteristic Research of SOI Rib Waveguide Resonators with SiO₂ Deposited." Key Engineering Materials 562-565 (July 2013): 727–30. http://dx.doi.org/10.4028/www.scientific.net/kem.562-565.727.

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With the extensive research and application of SOI nano-optical ring resonators, the problem of high integration becomes the bottleneck restricting its development. To research the effect of deposited SiO2 insulating layer on the resonance characteristic of SOI nano-waveguid ring cavity while integrating, a rib waveguide ring resonator with 500nm SiO2 insulating layer deposited was designed and fabricated in this paper. By testing the resonance transmission spectrum power of this structure, it is found that SiO2 insulating layer deposited has no effect on the grating vertical coupling efficiency while improves the quality factor to 14.000±1.000.

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Denisenko, D. V., and V. V. Radchenko. "Quasistasic modeling of edge fields in planar resonators." Issues of radio electronics 49, no. 5 (July 5, 2020): 64–70. http://dx.doi.org/10.21778/2218-5453-2020-5-64-70.

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This paper discusses quasistatic waveguide model for planar resonator placed in multilayer dielectic media, which do not use effective parameters such as effective width of resonator and effective dielectric constant. It allows to use waveguide model in new approach. Edge field is modeled by inclusion of LC-lumped element circuit where values of inductances and capacitances we determined from the solving of electrostatic Laplace equation by the method of moment using the three-dimensional Green function for multilayer dielectric media. A computational experiment showed that the proposed model is effective in modeling planar resonators of complex shape and requires low computational resources.

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Zhai, Xiang, Shuangchun Wen, Dong Xiang, Ling-Ling Wang, Wujiaihemaiti Rexidaiguli, Liu Wang, and Dianyun Fan. "A Subwavelength Plasmonic Waveguide Filter with a Ring Resonator." Journal of Nanomaterials 2013 (2013): 1–6. http://dx.doi.org/10.1155/2013/484207.

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The transmission characteristics of the electromagnetic wave are numerically investigated in two-dimensional compound plasmonic structures composed of two straight subwavelength metal-insulator-metal (MIM) waveguides and a ring resonator. The two straight MIM waveguides situate on both sides of the ring resonator, and the MIM waveguide of the outgoing side has a positional angular deviationθrelative to the MIM waveguide of the incoming side. The results show that the filtering performances of the asymmetric structures(θ≠0∘)are greatly improved in comparison with the symmetric structure(θ=0∘). For most of the asymmetric structures, there is a transmission minimum at the slightly bigger wavelength than one at which the transmission peak appears for the symmetric structures, and there is still a transmission peak at the wavelength of the transmission peak of the symmetric structures. Moreover, the difference between the transmission peak and valley is increased, and the breadth of the transmission peak becomes narrow.

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Wang, W., L. Zhang, K. Fang, and Y. W. Zhang. "Experimental study of EIT-Like phenomenon in a metamaterial plasma waveguide." Advanced Electromagnetics 1, no. 3 (November 17, 2012): 61. http://dx.doi.org/10.7716/aem.v1i3.93.

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This paper demonstrates the realization of the electromagnetically induced transparency (EIT)-like transmission in a metamaterial plasma waveguide with double side defects based on transmission lines. The waveguide with a single side defect works as a plasma resonator and the resonance wavelength is determined by the Fabry-Perot resonance of surface plasma. While in a waveguide with double side defects, a transmission peak appears between the two resonators frequencies because of the destructive interference between the resonance modes of the two resonators, which indicates a pronounced EIT phenomenon. The experiment results agree well with simulations in microwave frequencies.

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Wang, Yiquan, Tianzhe Wang, and Juan Liu. "Waveguide modes in coupled-resonator optical waveguides." Physics Letters A 353, no. 1 (April 2006): 101–4. http://dx.doi.org/10.1016/j.physleta.2005.12.099.

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Maulana, Yudi Yuliyus, and Dadin Mahmudin. "Design of 3-stages Parallel Cascade Micro-ring Resonator Type of Interleave Filter for Optical Communication Application." Jurnal Elektronika dan Telekomunikasi 15, no. 2 (June 29, 2016): 66. http://dx.doi.org/10.14203/jet.v15.66-70.

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Filter will be one of the most important components of the next generation of optical communications. Micro-ring resonators have been widely studied as a potential device for dense wavelength filter due to its advantages. In this paper, a waveguide-based microring-resonator type of interleave filter is investigated. The cascade structure is applied to obtain better characteristics of filter spectra. Our calculation shows that, compared with 2-stage or 4-stage cascade, 3-stage cascaded microring resonator has better performance with pass-band width of 22 GHz, ripple ratio < 1 dB, crosstalk of -33 dB for 1×2 interleaver and -24 dB for 1×4 interleaver. Numerical calculation also clearly shows that general optical waveguide types is reasonable as microring resonator with insertion loss < 2 dB

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Li, Chi, Meng Zhu, Peng Ji, Cong Xiong, and Changrui Liao. "In-Fiber BaTiO3 Microsphere Resonator for High-Sensitivity Temperature Measurement." Micromachines 12, no. 3 (March 18, 2021): 318. http://dx.doi.org/10.3390/mi12030318.

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A fiber optic whispering gallery mode (WGM) resonator was proposed and realized by integrating an inline polymer waveguide with a microsphere mounted on it. The polymer waveguide with a diameter of 1 μm was printed with femtosecond laser-assisted multiphoton polymerization in a section of a grooved hollow-core fiber, which was sandwiched between two single-mode fibers. Two WGW resonators assembled with microspheres of different sizes were prepared. The transmission spectra of those stimulated WGMs were investigated both in simulation and experimentally. The temperature response of the resonators was particularly studied, and a linear sensitivity of −593 pm/°C was achieved from 20 °C to 100 °C.

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Ye, Qihui, Chen Wang, Kai Guo, and Wenzhi Chen. "High-resolution demultiplexers based on coupled-resonator effect in cross plasmonic-waveguide structure." Modern Physics Letters B 28, no. 30 (December 10, 2014): 1450236. http://dx.doi.org/10.1142/s0217984914502364.

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An ultracompact wavelength demultiplexing structure based on the resonator-coupled effect is proposed and demonstrated numerically. The structure consists of a cross plasmonic-waveguide structure with baffles in the output channels, each of which functions as resonator. Due to the strong couplings of different resonators in the structure, a series of continuous sharp transmission spectra occur. This considerably increases the wavelength resolution of wavelength demultiplexing, which is obviously narrower than the full width of the isolated resonator. The proposed structure could be utilized to design of ultracompact wavelength-division multiplexing (WDM) systems for large-scale photonic integration.

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Rahiminejad, Sofia, Elena Pucci, Sjoerd Haasl, and Peter Enoksson. "SU8 ridge-gap waveguide resonator." International Journal of Microwave and Wireless Technologies 6, no. 5 (May 12, 2014): 459–65. http://dx.doi.org/10.1017/s1759078714000609.

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In this paper, we present the first ridge-gap waveguide resonator made with a polymer base. It is designed for the frequency range 220–325 GHz, and is fabricated solely using a Au coated two-layer SU8-based process. The design is based on previous work done with Si. The new process has advantages such as fewer and cheaper process steps. The SU8 ridge-gap waveguide resonator is made in order to obtain attenuation characteristics via the measured Q-factor of the resonator. The ridge-gap waveguide resonator has the same dimensions as the previous one fabricated in Si, and the same thickness of the Au coating. The SU8-based resonator shows an attenuation loss of 0.41 dB/mm at 282.2 GHz compared to the Si-based resonator with an attenuation loss of 0.043 dB/mm at 283.5 GHz. This makes the SU8 process a more cost-effective alternative to the Si process

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Du, Yang, and Ying Dong. "The Structure Design and Simulation of the Ring Resonator Based on SOI Planar Optical Waveguide for the Micro Biochemical Sensor." Key Engineering Materials 609-610 (April 2014): 914–20. http://dx.doi.org/10.4028/www.scientific.net/kem.609-610.914.

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A ring resonator based on Silicon-on-Insulator (SOI) planar optical waveguide for micro biochemical sensor application is designed and simulated in this paper. The SOI optical waveguide is made with a ridge structure. According to the optical waveguide mode theory and the performance of the ring resonator, the size of the single mode ridge waveguide and the structure of the ring resonator are obtained. Based on the structure principle and the transmission mechanism of electric field of the ring resonator, the power transfer function and the parametric equation of sensitivity are derived. As a result, the value of Q of the ring resonator can reach 103 magnitudes. At last, the structure and the transmission mechanism of electric field in the ring resonator are simulated in MATLAB software.

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Trubin, Alexander. "MUTUAL COUPLING COEFFICIENTS OF ROTATING RECTANGULAR DIELECTRIC RESONATORS IN CUT-OFF RECTANGULAR WAVEGUIDE." Information and Telecommunication Sciences, no. 1 (June 29, 2021): 48–54. http://dx.doi.org/10.20535/2411-2976.12021.48-54.

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Background. A further increase in the speed of information transfer is determined by more stringent requirements for the elements of communication devices. One of the most important components of such devices is various filters, which are often made on the basis of dielectric resonators. Calculation of the parameters of multi-section filters is impossible without further development of the theory of their design. The development of filter theory is based on electrodynamic modelling, which involves calculating the coupling coefficients of dielectric resonators in various transmission lines. Objective. The aim of the research is to calculate and study the coupling coefficients of rectangular dielectric resonators with a rectangular metal waveguide when their axes rotate. Investigation of new effects to improve the performance of filters and other devices based on them. Methods. Methods of technical electrodynamics are used to calculate and analyse the coupling coefficients. The end result is to obtain new analytical formulas for new structures with rectangular dielectric resonators, which make it possible to analyse and calculate their coupling coefficients. Results. New analytical expressions are found for the coupling coefficients of dielectric resonators with the rotation of their axes in a rectangular waveguide. Conclusions. The theory of designing filters based on new structures of dielectric resonators with rotation of their axes in metal waveguides has been expanded. New analytical relationships and new patterns of change in the coupling coefficients are found. Keywords: dielectric filter; rectangular dielectric resonator; rotation; coupling coefficients.

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Tan, F. S., D. J. W. Klunder, G. Sengo, H. Kelderman, A. Hollink, H. J. W. M. Hoekstra, and A. Driessen. "Characterization of Vertically Waveguide Coupled Microring Resonators by Means of Quantitative Image Analysis." Journal of Nonlinear Optical Physics & Materials 12, no. 02 (June 2003): 205–12. http://dx.doi.org/10.1142/s021886350300133x.

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The standard method of measuring the response of a micro resonator with in- and output waveguides consists of detecting the output power as a function of wavelength. In this paper a complementary method by means of quantitative image analysis is proposed. A vertically coupled waveguide microring resonator has been characterized with this method by projecting the scattered power of the device to an IR camera and analyzing the image as a function of wavelength. The reliability of this method has been confirmed by comparison with the standard measurement.

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Hakoda, Christopher, Cliff Lissenden, and Parisa Shokouhi. "Clamping Resonators for Low-Frequency S0 Lamb Wave Reflection." Applied Sciences 9, no. 2 (January 12, 2019): 257. http://dx.doi.org/10.3390/app9020257.

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A recent elastic metamaterial study found that resonators that “clamp” a plate waveguide can be used to create a frequency stop-band gap. The result was that the resonator array can prohibit the propagation of an A0 Lamb wave mode. This study investigates whether the concept can be extended to S0 Lamb wave modes by designing resonators that can prohibit the propagation of S0 Lamb wave modes in a 1-mm aluminum plate waveguide at 50 kHz. The frequency-matched resonators did not reduce the transmitted signal, leading to the conclusion that the design concept of frequency-matched resonators is not always effective. On the other hand, the resonators designed to clamp the upper surface of the plate were very effective and reduced the transmitted signal by approximately 75%.

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Zhang, Jianhao, Rongbo Wu, Min Wang, Youting Liang, Junxia Zhou, Miao Wu, Zhiwei Fang, Wei Chu, and Ya Cheng. "An Ultra-High-Q Lithium Niobate Microresonator Integrated with a Silicon Nitride Waveguide in the Vertical Configuration for Evanescent Light Coupling." Micromachines 12, no. 3 (February 25, 2021): 235. http://dx.doi.org/10.3390/mi12030235.

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We demonstrate the hybrid integration of a lithium niobate microring resonator with a silicon nitride waveguide in the vertical configuration to achieve efficient light coupling. The microring resonator is fabricated on a lithium niobate on insulator (LNOI) substrate using photolithography assisted chemo-mechanical etching (PLACE). A fused silica cladding layer is deposited on the LNOI ring resonator. The silicon nitride waveguide is further produced on the fused silica cladding layer by first fabricating a trench in the fused silica while using focused ion beam (FIB) etching for facilitating the evanescent coupling, followed by the formation of the silicon nitride waveguide on the bottom of the trench. The FIB etching ensures the required high positioning accuracy between the waveguide and ring resonator. We achieve Q-factors as high as 1.4 × 107 with the vertically integrated device.

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Song, Kaijun, Mou Luo, Cuilin Zhong, and Yuxuan Chen. "High-isolation diplexer based on dual-mode substrate integrated waveguide resonator." International Journal of Microwave and Wireless Technologies 12, no. 4 (October 24, 2019): 288–92. http://dx.doi.org/10.1017/s1759078719001387.

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AbstractA high-isolation diplexer based on a dual-mode substrate integrated waveguide (SIW) resonator is proposed in this paper. Based on the theory of the dual-mode resonator, the miniaturized diplexers are designed by using the SIW dual-mode resonators. The superior isolation of the diplexers is obtained because the two operating modes of the dual-mode SIW resonators are not directly coupled and there is no interference with each other. In order to further improve the isolation of the circuit, the number of the order of the diplexer is added. Equivalent circuits are given to analyze and design the dual-mode high-isolation diplexers. Detailed analyses are given according to the equivalent circuits. The dual-mode third-order and fourth-order diplexers are designed and fabricated. The measured results agree well with the simulated ones. The total sizes of the fabricated third-order and fourth-order diplexers are 1.78λg × 2.64λg and 1.79λg × 3.63λg, respectively.

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Sacher, W. D., and J. K. S. Poon. "Characteristics of Microring Resonators With Waveguide-Resonator Coupling Modulation." Journal of Lightwave Technology 27, no. 17 (September 2009): 3800–3811. http://dx.doi.org/10.1109/jlt.2009.2016852.

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Zeyde, K. M. "A case study of a loaded rectangular resonator with circular holes under the cavity perturbation theory." Ural Radio Engineering Journal 4, no. 3 (2020): 261–76. http://dx.doi.org/10.15826/urej.2020.4.3.001.

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In this paper, a detailed description of a case study carried out for a specific electrodynamic system is given: a rectangular resonator made on a section of the WR90 waveguide, excited by a diaphragm and loaded onto round holes cut in its narrow wall. Considered structure has a certain practical significance, especially within the limits of restoring the electrophysical parameters of the samples placed in the cavity of the resonator by through holes. Thus, this case study, among other things, touches upon the main provisions of the resonator’s cavity perturbation method. The considered device was studied both in the natural experiment installation and in the process of model studies, which were carried out in various eigenfrequencies and eigenmodes numerical solvers for an electrodynamic system. The article provides a full description of the structure under consideration, its practical significance; the study of the waveguide inner surface roughness influence on the main parameters of the resonator is given; describes the technique for the experimental determination of the resonator Q-factor from the circuit haracteristics. An algorithm for the loaded resonator Q-factor calculating is proposed and experimentally verified. Additionally, the specific situation of inserting a cylindrical perturbation into the cavity of the resonator is considered. We provide the value of the sample shape factor, and outline the applicability boundaries of the perturbation method in this case study.

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Mospan, Lyudmila P., and Sergiy O. Steshenko. "A multi-function resonator based on an asymmetric tri-post rectangular waveguide section." International Journal of Microwave and Wireless Technologies 12, no. 10 (July 22, 2020): 1005–11. http://dx.doi.org/10.1017/s1759078720000951.

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AbstractA novel waveguide resonator is proposed in the paper. The resonator is composed of three rectangular partial-height posts inserted along a rectangular waveguide cross-section. A pair of lateral posts is mounted symmetrically whereas the third antipodal post is centered. The resonator enables bandreject, singlet-type, and pseudoelliptic responses. The operating regimes are achieved by a manipulation with the pair of lateral posts, namely by changing their heights or their locations in a waveguide cross-section. A filtering function is realized as the third mode is exploited as the resonant one. Measurement data are presented for WR90 waveguide. An explanation of the resonant phenomena in post-based sections in terms of eigen regimes and interacting oscillations is proposed.

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Sun, Jiayi, Kenichi Maeno, Shoma Aki, Kenji Sueyoshi, Hideaki Hisamoto, and Tatsuro Endo. "Design and Fabrication of a Visible-Light-Compatible, Polymer-Based Photonic Crystal Resonator and Waveguide for Sensing Applications." Micromachines 9, no. 8 (August 17, 2018): 410. http://dx.doi.org/10.3390/mi9080410.

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In this paper, we have proposed a polymer-based photonic crystal (PhC) resonator, with multiple sizes of cavities, and a waveguide to be used as highly sensitive optical sensor components. Properties of the proposed PhC were simulated by the finite-difference time-domain method, and the polymer-based PhC resonator and waveguide were fabricated on a photoresist (polymer) by electron beam lithography, which was prepared on an Au-layer-deposited Si substrate. We detected the resonant light that penetrated through the waveguide and was trapped in the PhC resonator. Optical characteristics of the fabricated PhC were evaluated by detecting the polymer layer deposition process by using the layer-by-layer (LbL) method to deposit polymer layers. As a result, by using an optimized design of a polymer-based PhC resonator with a long cavity (equivalent to a defect of three holes), the PhC structure changes caused by LbL deposition lead to changes in resonant light wavelength (peak shift: 5.26 nm/layer). Therefore, we suggest that a PhC resonator and a waveguide is applicable as an optical sensor.

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Rajni, Rajni, Gurwinder Singh, and Anupma Marwaha. "Modeling of Split Ring Resonators loaded microstrip line with different orientations." International Journal of Electrical and Computer Engineering (IJECE) 5, no. 6 (November 1, 2015): 1363. http://dx.doi.org/10.11591/ijece.v5i6.pp1363-1371.

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This paper presents the different circuit approaches of the electric and magnetic interaction of Single Split Ring Resonator (SRR) loaded microstrip line. We loaded the microstrip line with planar square split ring resonator in different configurations and orientations. The modeling behavior of metamaterials-based microstrip lines loaded with single and two-mirrored split ring resonators is analyzed numerically in two orientations (with gap of SRR parallel and perpendicular to the line). The full wave simulations are performed for the single and two-mirrored split ring resonators loaded microstrip inside a waveguide with ‘High Frequency Structure Simulator’ software. The equivalent circuit parameters are obtained for the single split ring resonator loaded with microstrip line with the gap parallel and near to the line from transmission line theory that make use of just the resonance frequency and minimum of the reflection coefficient. The simulation of different orientations of split ring resonator gives better reflection coefficient and wider frequency.

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Ho, Victor W. L., Yao Chang, Yang Liu, Chi Zhang, Yuhua Li, Roy R. Davidson, Brent E. Little, Guanghui Wang, and Sai T. Chu. "Optical Trapping and Manipulating with a Silica Microring Resonator in a Self-Locked Scheme." Micromachines 11, no. 2 (February 15, 2020): 202. http://dx.doi.org/10.3390/mi11020202.

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Based on the gradient force of evanescent waves in silica waveguides and add-drop micro-ring resonators, the optical trapping and manipulation of micro size particles is demonstrated in a self-locked scheme that maintains the on-resonance system even if there is a change in the ambient temperature or environment. The proposed configuration allows the trapping of particles in the high Q resonator without the need for a precise wavelength adjustment of the input signal. On the one hand, a silicon dioxide waveguide having a lower refractive index and relatively larger dimensions facilitates the coupling of the laser with a single-mode fiber. Furthermore, the experimental design of the self-locked scheme reduces the sensitivity of the ring to the environment. This combination can trap the micro size particles with a high stability while manipulating them with high accuracy.

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Qian, Guang, Jie Tang, Xiao-Yang Zhang, Ruo-Zhou Li, Yu Lu, and Tong Zhang. "Low-Loss Polymer-Based Ring Resonator for Resonant Integrated Optical Gyroscopes." Journal of Nanomaterials 2014 (2014): 1–6. http://dx.doi.org/10.1155/2014/146510.

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Waveguide ring resonator is the sensing element of resonant integrated optical gyroscope (RIOG). This paper reports a polymer-based ring resonator with a low propagation loss of about 0.476 dB/cm for RIOG. The geometrical parameters of the waveguide and the coupler of the resonator were optimally designed. We also discussed the optical properties and gyroscope performance of the polymer resonator which shows a high quality factor of about 105. The polymer-based RIOG exhibits a limited sensitivity of less than 20 deg/h for the low and medium resolution navigation systems.

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Feng, Zuo, Yuming He, Wei Yan, Fuhua Yang, Weihua Han, and Zhaofeng Li. "Progress of Waveguide Ring Resonators Used in Micro-Optical Gyroscopes." Photonics 7, no. 4 (October 26, 2020): 96. http://dx.doi.org/10.3390/photonics7040096.

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Micro-optical gyroscopes (MOGs) are a type of high-accuracy gyroscope, which have the advantages of miniaturization, low cost, and satisfactory operating power. The quality factor (Q) of the waveguide ring resonators (WRRs) is very important to the performance of MOGs. This paper reviews various MOGs using WRRs made from different materials, including silica, indium phosphide, calcium fluoride, and polymer WRRs. The different architectures of the MOGs are reviewed, such as double-ring resonator MOGs and multiple-ring resonator MOGs. Candidate high-Q WRRs for MOGs, including silicon nitride, lithium niobite, calcium fluoride, and magnesium fluoride WRRs, are also reviewed. The manufacturing process, Q, and integration density values are compared. Summarizing the advanced WRRs and calculating the shot-noise-limited sensitivity are helpful processes in selecting suitable materials to fabricate MOGs.

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Kolosov, S. V., and I. E. Zaitseva. "GYROTRONES WITH CONE-SHAPED RESONATORS." Doklady BGUIR 18, no. 2 (March 31, 2020): 14–22. http://dx.doi.org/10.35596/1729-7648-2020-18-2-14-22.

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In this paper we compared the efficiency of the cylindrical, conical, and biconical types of gyrotron resonators. Based on the results of comparing the three studied variants of gyrotron profile, it was concluded that the regular-type profile is the least efficient. This type of a resonator made it possible to achieve the level of efficiency of only 23 %, which can be increased in the regular-waveguide gyrothrons only through several modes or by recovering the electrons on the collector. The medium efficiency option is the biconical profile of the resonator. Its efficiency accounted for 42 %. Through a scientific study we revealed an increase in the efficiency for gyrotrons with conical resonators from 23 to 50 % in the TE01 wave. It is worth mentioning that obtaining such efficiency requires phase grouping of the electrons in an increasing high-frequency field by means of an electromagnetic field with further selection of energy from the electron beam in a strong decaying electromagnetic field. The efficiency of 50 % exceeds significantly that of a gyrotron with a regular cavity profile of ~30 %. The gyrotron efficiency for a waveguide profile with a conical resonator and with recovery on the collector can reach 80 %. To carry out the calculations, the KEDR software package was used, and the optimization of the gyrotron parameters, in particular, was carried out using the GYRO-K software. This software has several advantages over other similar options based on the “PIC” code. GYRO-K makes it possible to obtain a high convergence rate when solving boundary value problems, as well as to solve the problem of optimizing the waveguide profile of gyroresonance devices with an acceptable computational burden. Conical cavity gyrotrons can be widely used in industry to create effective gyrotrons for spectroscopy, diagnostics of various media, and for technological needs.

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Morozov, V. M., and V. I. Magro. "The features of the use of the waveguide radiators in smart antenna systems." Journal of Physics and Electronics 26, no. 1 (December 3, 2018): 89–92. http://dx.doi.org/10.15421/331815.

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The features of the use of finite waveguide antenna arrays in the structure of modern smart antenna systems are considered. The paper deals with the problem of diffraction of an electromagnetic wave on a finite waveguide antenna array scanning in the E-plane. Antenna array consists of five radiating elements. The open ends of the waveguides are surrounded by a metal screen. The resonator coupling region was chosen as matching elements. The solution of the problem is carried out by the integral equation method on the basis of the selection of overlapping regions. The problem reduces to solving the Fredholm integral equation of the second kind. An array of infinitely thin plates and that of waveguides with a finite wall thickness are considered. The main regularities for choosing the optimal geometric dimensions of the antenna array are established. Studies were carried out for arrays with a number of elements from five to fifteen. The analysis of edge effects in the final antenna array is carried out. It is shown that the introduction of a resonator region into a five-element lattice makes it possible to expand the sector of the radiation angles and avoid the effect of blinding. It is shown that this statement is valid not only for five-element lattices, but also for arrays with a large number of radiating elements. The radiation patterns are calculated. The coefficients of mutual coupling in an array with five elements are investigated. General recommendations for choosing optimal sizes of the resonator coupling region of radiators are considered.

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Sripakdee, Chatchawal, and Napatasakon Sarapat. "Designing of Universal WGM Biosensor from Micro Ring Resonator." Applied Mechanics and Materials 879 (March 2018): 173–77. http://dx.doi.org/10.4028/www.scientific.net/amm.879.173.

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The WGM biosensor using a nonlinear silica micro ring resonator coating by nano gold layer is designed and examined. The simulation results of Gaussian laser pulses propagating in the symmetry waveguide shows good behavior of the existence of whispering gallery mode outside the surface of the ring resonators coating by a very thin nano gold layer to trap biomolecules with the plasmonic interaction. The output shifted signals from the designed sensor have an accuracy to characterize types of the specific biomolecules as well.

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39

Chen, Fang, Huafeng Zhang, Lihui Sun, Jijun Li, and Chunchao Yu. "Tunable plasmonic-induced transparency based on stub-coupled cascade ring resonator with electro-optical material." Modern Physics Letters B 33, no. 18 (June 26, 2019): 1950206. http://dx.doi.org/10.1142/s0217984919502063.

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The electrical control of plasmonic-induced transparency (PIT) via a resonator waveguide system is presented. The proposed structure is composed of a stub and cascade ring resonator. The ring and the stub resonator are filled with electro-optical material which can control the resonance frequency by the external voltage. Two-dimensional finite difference time domain (2D FDTD) method is used to calculate the transmission and field distribution. Single PIT is investigated both by FDTD and Coupled Mode Theory (CMT). The proposed PIT can be tuned by changing the external voltage or the geometric parameters. Double and triple PIT can be obtained by introducing more ring resonators and can be tuned by external voltage. The proposed plasmonic structure may have application in slow light device, nanoscale filter, all-optical switch and refractive index sensor.

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40

Fathnan, A. A., Taufiqqurrachman ., Y. N. Wijayanto, D. Mahmudin, and P. Daud. "Efek Kopling pada Filter Metamaterial Coplanar Waveguide Menggunakan SRRs Persegi Panjang Horizontal." Jurnal Elektronika dan Telekomunikasi 15, no. 1 (June 29, 2016): 18. http://dx.doi.org/10.14203/jet.v15.18-22.

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Dalam penelitian ini telah dilakukan pembuatan filter gelombang mikro menggunakan teknologi coplanar waveguide (CPW) yang dibebani dengan struktur metamaterial. Struktur metamaterial tersebut terdiri dari sepasang resonator cincin terbelah (split ring resonators/SRRs) berbentuk persegi panjang yang dicetak di belakang substrat dielektrik. Sementara itu, CPW dicetak dengan tambahan konektor kecil tepat di atas SRRs tersebut. Variasi panjang dan lebar dari SRRs persegi panjang (horizontal dan vertikal) telah dilakukan untuk melihat efek dari kopling antara saluran transmisi CPW ke SRRs. Variasi jarak antara sel-sel resonator (SRRs) juga telah disimulasikan untuk melihat efek dari kopling antara sel-sel yang berdekatan. Analisis dengan simulasi elektromagnetik dan data dari eksperimen telah menunjukkan bahwa kinerja bandwidth filter yang berbeda telah ditemukan dengan merubah struktur SRRs maupun dengan merubah jarak antara sel-sel resonator (SRRs). Telah ditemukan pula bahwa kontribusi yang signifikan dari kopling antara CPW ke SRRs menunjukkan bahwa SRRs persegi panjang horizontal dapat dimanfaatkan untuk meningkatkan performa filter. Hasil penelitian ini dapat digunakan untuk menganalisis konfigurasi geometris SRRs yang memberikan optimalisasi praktis paling baik untuk pembuatan filter metamaterial CPW.

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Xie, Yong Chao, Jin Yan Shi, and Xue Yong Ding. "Comparatively Study of Coaxial Waveguide and Open Coaxial Cavity." Advanced Materials Research 694-697 (May 2013): 1417–20. http://dx.doi.org/10.4028/www.scientific.net/amr.694-697.1417.

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In this paper, the computational formula of field distribution in a coaxial waveguide and the field distribution, resonant frequency and Q factors of open coaxial resonator are introduced. The S21 and the field profile of the TEM mode in a coaxial waveguide, and the field profile and E-field of the mode in a coaxial resonator is gained by the software CST microware studio. The truth that an open coaxial cavity is virtually a slow-varied section coaxial waveguide is gained.

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Bera, Arijit, Markku Kuittinen, Seppo Honkanen, and Matthieu Roussey. "Silicon slot waveguide Fano resonator." Optics Letters 43, no. 15 (July 17, 2018): 3489. http://dx.doi.org/10.1364/ol.43.003489.

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43

Chremmos, Ioannis, and Otto Schwelb. "Diatomic coupled-resonator optical waveguide." Journal of the Optical Society of America B 27, no. 6 (May 19, 2010): 1242. http://dx.doi.org/10.1364/josab.27.001242.

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44

Hameed, Musab, Gaobiao Xiao, Lina Qiu, Can Xiong, and Tayyab Hameed. "Multiple-Mode Wideband Bandpass Filter Using Split Ring Resonators in a Rectangular Waveguide Cavity." Electronics 7, no. 12 (November 26, 2018): 356. http://dx.doi.org/10.3390/electronics7120356.

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This paper presents a simple split ring resonator excitation to realize a multi-mode wideband bandpass filter in a rectangular waveguide cavity. The proposed resonator employs two rectangular split rings attached with two coaxial probes extended into the cavity to excite two resonant modes, unlike the conventional cavity resonators which employ conductive cylinders in the cavities to achieve the same results. A hybrid magnetic (HM) mode and a hybrid electric (HE) mode are the two hybrid modes excited to realize the wideband bandpass filter. The filter operates at 2.5 GHz center frequency with 53% fractional bandwidth. Finally, the prototypes of a second and a fourth order filter are fabricated for results validation. Measured results are in good agreement with the simulated ones.

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45

Eremenko, Z. E., A. I. Shubnyi, A. Y. Kogut, and R. S. Dolia. "High loss liquid dielectric characterization: Comparison of microwave waveguide and resonator measurement techniques." International Journal of Microwave and Wireless Technologies 12, no. 9 (May 29, 2020): 892–99. http://dx.doi.org/10.1017/s1759078720000628.

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AbstractThe microwave waveguide and resonator methods are compared as applied to the experimental determination of the dielectric properties of high loss liquids. A differential microwave waveguide cavity for measuring high loss liquids complex permittivity in a small volume has been designed and studied. This cavity consists of two circular waveguide cells with central rods made of quartz and surrounded by high loss liquid tested. The cells have different lengths to eliminate complex propagation coefficient measurement errors due to the diffraction effect on the ends of the layered waveguide cells. We have measured the wave amplitude and phase coefficients for the waveguide cavity to estimate physical properties of a high loss liquid under test. The resonant frequencies and the Q-factor of a semi-disk dielectric resonator with high loss liquid filling a capillary have been measured. We have selected water-ethanol solutions as a high loss liquid under test for both techniques. We have determined the measurement sensitivity for these two techniques. The measuring results are discussed. Both the waveguide and resonator methods provide comparable sensitivity and can be successfully used for the complex permittivity characterization of high loss liquids in small volumes.

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Kogut, A. E., M. T. Islam, E. A. Kogut, Z. E. Eremenko, and R. S. Dolia. "Increasing the Q-factor of thin planar dielectric resonator with whispering gallery modes." International Journal of Microwave and Wireless Technologies 12, no. 10 (May 13, 2020): 960–68. http://dx.doi.org/10.1017/s1759078720000525.

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AbstractThe spectral and energy characteristics of the tunable thin planar dielectric resonator with the movable metal mirror are researched. It is found that the high-Q HE-polarized whispering gallery modes (WGMs) are effectively excited in such a resonator by the dielectric waveguide. A mode set of the tunable thin planar dielectric resonator depends on the presence of an air gap in its design. Changing the height of the air gap affects the energy characteristics of the tunable thin planar dielectric resonators (DR). Shifting the resonant fields of WGMs from the dielectric disk to the air gap is the reason for this effect. It is shown that at certain heights of the air gap, increasing the unloaded Q-factor of the tunable thin planar DR and improving the excitation efficiency of WGMs in it is achieved.

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HAMIDI, S. M., and Z. ESLAMIAT. "OPTICAL BISTABILITY IN ONE-DIMENSIONAL COUPLED RESONATOR NONLINEAR OPTICAL WAVEGUIDE." Journal of Nonlinear Optical Physics & Materials 22, no. 01 (March 2013): 1350003. http://dx.doi.org/10.1142/s0218863513500033.

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In this paper, the optical bistability in finite size one-dimensional coupled resonator nonlinear optical waveguide has been investigated. To calculate the bistable switching manner in five proposed structures, we use the linear and nonlinear transfer matrices with fixed point iteration method. Our results show that the threshold and domain of bistable switching answer depend on the defect region in one-dimensional coupled resonator nonlinear optical waveguides. Also, the best answer of switch takes place at the left and right edges of the photonic band gap of the structures depending on the defect regions. In fact, due to the presence of the photonic band gap in the slow wave system, the density of states of the electromagnetic fields is large at the photonic band edge and photonic defect modes and thus the group velocity is small, and the local field is enhanced. All these factors contribute to a significant decrease in the threshold of optical bistable switching devices.

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GUO, HAO, QINGHUA LIAO, TIANBAO YU, SHUWEN CHEN, and YONGZHEN HUANG. "DESIGN OF HIGH EFFICIENCY AND LARGE SEPARATING ANGLE BEAM SPLITTER BASED ON PHOTONIC CRYSTAL CAVITY RESONATOR." Modern Physics Letters B 25, no. 24 (September 20, 2011): 1963–69. http://dx.doi.org/10.1142/s0217984911027212.

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We present the design and simulation of an ultracompact high efficiency beam splitter based on propagation properties of the light waves in waveguide and cavity resonator. The splitting properties of the beam splitter have been numerically simulated and analyzed using the plane wave expansion (PWE) method and finite difference time domain (FDTD) method. Then in order to minimize backward reflections and to obtain equal distribution of power, we placed a cavity resonator waveguides to optimize the devices. It is shown that a beam splitter with high efficiency and large separating angle for TM mode can be achieved. There is no doubt that these excellent features will provide the structure a promising applying prospect for photonic integrated circuit.

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Bornemann, Jens, and Seng Yong Yu. "Novel designs of polarization-preserving circular waveguide filters." International Journal of Microwave and Wireless Technologies 2, no. 6 (December 2010): 531–36. http://dx.doi.org/10.1017/s1759078710000760.

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Novel designs of circular waveguide components for lowpass, highpass, bandpass, and bandstop applications are presented. The filters are formed by cascaded TM11-mode resonator sections which share a common axis, thus preserving the polarizations of input signals due to rotational symmetry. Moreover, the filters are smaller than standard TE11-mode bandpass filters. Basic design considerations are discussed with respect to the connection of TM11-mode resonators through circular irises. Design principles for all four filter types are presented and their performances computed by the coupled-integral equation technique (CIET). All filter performances are verified by the commercially available software package μWave Wizard, and structural dimensions are provided.

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Shen, Kai, Tao Li, and Jing Jing Wang. "A Novel Planar Extended Doublet Filter with Substrate Integrated Waveguide Cavity Resonators." Advanced Materials Research 631-632 (January 2013): 962–66. http://dx.doi.org/10.4028/www.scientific.net/amr.631-632.962.

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A novel planar extended doublet filter based on substrate Integrated waveguide cavity resonators was proposed for the first time. This filter consists of a main doublet with an additional resonator grown in one of the branches. The source and load are coupled to both branches of the doublet in order to generate two transmission zeros. By employing the combinational structure of the TE101-mode and TE102-mode of the SIW cavity resonators, the negative coupling coefficient required for the design of a single-layer cross-coupled SIW bandpass filter is implemented. The measurement results show the return loss of the implemented filter is above 13dB, the insertion loss is below 4.238dB with only 0.56% of the bandwidth.

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Journal articles on the topic 'Waveguide resonator'

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