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Articoli di riviste sul tema "DIELECTRIC NANOANTENNA"

Autore: Grafiati

Pubblicato: 11 settembre 2023

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1

Maksymov, Ivan S., Isabelle Staude, Andrey E. Miroshnichenko e Yuri S. Kivshar. "Optical Yagi-Uda nanoantennas". Nanophotonics 1, n. 1 (1 luglio 2012): 65–81. http://dx.doi.org/10.1515/nanoph-2012-0005.

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AbstractConventional antennas, which are widely employed to transmit radio and TV signals, can be used at optical frequencies as long as they are shrunk to nanometer-size dimensions. Optical nanoantennas made of metallic or high-permittivity dielectric nanoparticles allow for enhancing and manipulating light on the scale much smaller than wavelength of light. Based on this ability, optical nanoantennas offer unique opportunities regarding key applications such as optical communications, photovoltaics, nonclassical light emission, and sensing. From a multitude of suggested nanoantenna concepts the Yagi-Uda nanoantenna, an optical analogue of the well-established radio-frequency Yagi-Uda antenna, stands out by its efficient unidirectional light emission and enhancement. Following a brief introduction to the emerging field of optical nanoantennas, here we review recent theoretical and experimental activities on optical Yagi-Uda nanoantennas, including their design, fabrication, and applications. We also discuss several extensions of the conventional Yagi-Uda antenna design for broadband and tunable operation, for applications in nanophotonic circuits and photovoltaic devices.

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2

Lv, Jingwei, Debao Wang, Chao Liu, Jianxin Wang, Lin Yang, Wei Liu, Qiang Liu, Haiwei Mu e Paul K. Chu. "Theoretical Analysis of Hybrid Metal–Dielectric Nanoantennas with Plasmonic Fano Resonance for Optical Sensing". Coatings 12, n. 9 (26 agosto 2022): 1248. http://dx.doi.org/10.3390/coatings12091248.

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A nanoantenna with Fano response is designed with plasmonic oligomers as a refractive index sensor to enhance surface-enhanced Raman scattering (SERS) in the visible light spectrum. The scattered radiation and field-enhanced interactions of the outer gallium phosphide (GaP) nanoring assembled with an inner heptamer of silver with Fano response are investigated systematically using the finite element method. The characteristics of Fano resonance are found to depend on the size, shape and nature of the materials in the hybrid nanoantenna. The confined electromagnetic field produces a single-point electromagnetic hotspot with up to 159.59 V/m. The sensitivity obtained from the wavelength shift and variation in the scattering cross-section (SCS) shows a maximum value of 550 nm/RIU. The results validate the design concept and demonstrate near-field enhancement, enabling the design of high-performance nanoantennas with enhanced optical sensing and SERS properties.

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Ergul, O., G. Isiklar, I. C. Cetin e M. Algun. "Design and Analysis of Nanoantenna Arrays for Imaging and Sensing Applications at Optical Frequencies". Advanced Electromagnetics 8, n. 2 (25 febbraio 2019): 18–27. http://dx.doi.org/10.7716/aem.v8i2.1010.

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We present computational analysis of nanoantenna arrays for imaging and sensing applications at optical frequencies. Arrays of metallic nanoantennas are considered in an accurate simulation environment based on surface integral equations and the multilevel fast multipole algorithm developed for plasmonic structures. Near-zone responses of the designed arrays to nearby nanoparticles are investigated in detail to demonstrate the feasibility of detection. We show that both metallic and dielectric nanoparticles, even with subwavelength dimensions, can be detected.

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4

Agrahari, Rajan, e Hadi K. Shamkhi. "Highly Directive All-Dielectric Nanoantenna". Journal of Physics: Conference Series 2015, n. 1 (1 novembre 2021): 012003. http://dx.doi.org/10.1088/1742-6596/2015/1/012003.

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Abstract A highly directive dielectric nanoantenna in an integrated chip may enable faster communication as their low losses and small size overcome the limitation of temperature enhancement and low data transfer rate. We optimize nanoantenna consist of Si-nanoblock in the near-infrared region to efficiently transfer a point dipole light to a highly directive light in the far-field region. We engineer the intrinsic electric and magnetic resonances of a Si-block nanoantenna by modifying and reducing its geometrical symmetry. We realize a pronounced enhancement of directivity by systematically inducing perturbation in the Silicon block so that both its reflection and rotational symmetries are broken. Finally, we retain the traditional method to increase resonance’s coupling to outer space by introducing substrate with an increasing refractive index. We find that the directivity has boosted rapidly.

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5

Fujii, Minoru, e Hiroshi Sugimoto. "(Invited, Digital Presentation) Enhancement of Magnetic Dipole Transition of Molecules By Silicon Nanoparticle Nanoantenna". ECS Meeting Abstracts MA2022-01, n. 20 (7 luglio 2022): 1081. http://dx.doi.org/10.1149/ma2022-01201081mtgabs.

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A nanoantenna is a nanodevice that manipulates light propagation and enhances light-matter interaction at the nanoscale. Integration of an emitter into a nanoantenna capable of increasing local density of photonic states at the emission wavelength results in the enhanced spontaneous emission rate (Purcell effect). The most widely studied nanoantennas for the Purcell enhancement are plasmonic nanoantennas made from gold or silver nanostructures supporting surface plasmon resonances. In most cases, nanoantennas have been used for the enhancement of electric dipole-allowed transition of a molecule. In addition, recently, nanoantennas capable of enhancing magnetic dipole transition of a molecule are attracting attention. For the magnetic Purcell enhancement, nanoantennas have to have magnetic resonances at the optical frequency. Although it is possible to achieve magnetic resonances at the optical frequency by plasmonic nanostructures, the inherent absorption loss of noble metals limits the magnetic Purcell enhancement. On the other hand, nanoparticles of high refractive index dielectrics inherently have low-loss magnetic-type Mie resonances at the optical frequency, and thus are potentially more attractive as a material to realize large magnetic Purcell enhancement. We have developed spherical nanoparticles of crystalline silicon (Si) having the magnetic dipole (MD) and quadrupole (MQ) Mie resonances at the optical frequency [1]. In this work, to demonstrate the potential of a Si nanoparticle as a nanoantenna for the magnetic Purcell enhancement, we develop a composite nanoparticle, that is, a Si nanosphere decorated with europium ion (Eu3+) complexes, in which magnetic dipole emission of Eu3+ is efficiently coupled to the magnetic Mie modes of the nanosphere [2]. We systematically investigate the light scattering and photoluminescence spectra of the coupled system by means of single particle spectroscopy. The results are shown in Figure 1. By tuning the MQ Mie resonance of a Si nanosphere to the 5D0-7F1 magnetic dipole transition of Eu3+, the branching ratio between the magnetic and electric dipole (5D0-7F2) transitions is enhanced up to 7 times. The observed large magnetic Purcell enhancement offers an opportunity to develop novel fluorophores with enhanced magnetic dipole emission. Furthermore, the enhanced magnetic field of dielectric Mie resonators enhances otherwise very weak absorption due to magnetic dipole transition, and makes direct excitation of triplet states of a molecule possible [3]. Direct excitation of triplet states reduces photon energy necessary for energy conversion and chemical reactions utilizing a triplet state compared to a conventional process involving singlet-singlet excitation and singlet-triplet intersystem crossing. [1] H. Sugimoto, et. al., "Mie Resonator Color Inks of Monodispersed and Perfectly Spherical Crystalline Silicon Nanoparticles" Advanced Optical Materials, 8 (2020) 2000033. [2] H. Sugimoto, and Minoru Fujii, "Magnetic Purcell Enhancement by Magnetic Quadrupole Resonance of Dielectric Nanosphere Antenna", ACS Photonics, 8 (2021) 1794. [3] H. Sugimoto, et. al., "Direct Excitation of Triplet State of Molecule by Enhanced Magnetic Field of Dielectric Metasurfaces", Small, 2021, DOI: 10.1002/smll.202104458. Figure 1: Photoluminescence (red curves) and scattering (black curves) spectra of single Si naosphere-Eu3+ complex composite nanoparticles with different Si nanosphere diameters. The diameters are shown at the right end of the figure. Figure 1

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6

Yang, Guoce, Yijie Niu, Hong Wei, Benfeng Bai e Hong-Bo Sun. "Greatly amplified spontaneous emission of colloidal quantum dots mediated by a dielectric-plasmonic hybrid nanoantenna". Nanophotonics 8, n. 12 (13 novembre 2019): 2313–19. http://dx.doi.org/10.1515/nanoph-2019-0332.

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AbstractOptical nanoantennas can efficiently harvest electromagnetic energy from nanoscale space and boost the local radiation to the far field. The dielectric-metal nanogap is a novel design that can help to overcome the core issue of optical loss in all-metal nanostructures while enabling photon density of states larger than that in all-dielectric counterparts. This article reports that a crystalline spherical silicon nanoparticle on metal film (SiNPoM) nanoantenna can largely enhance the spontaneous emission intensity of quantum dots by an area-normalized factor of 69 and the decay rate by 42-fold compared with quantum dots on glass. A high total quantum efficiency of over 80%, including ~20% for far-field radiation and ~60% for surface plasmon polaritons, is obtained in simulation. Thanks to not only the low optical loss in dielectric nanoparticles but also the appropriate gap thickness which weakens the non-radiative decay due to the quenching from metal. Mie resonant modes additionally provide the flexible control of far-field emission patterns. Such a simple optical nanoantenna can be combined with various nanoscale optical emitters and easily extended to form large area metasurfaces functioning as active regions in light-emitting devices in applications such as advanced display, wireless optical communication, and quantum technology.

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7

Ullah, Kaleem, Braulio Garcia-Camara, Muhammad Habib, Xuefeng Liu, Alex Krasnok, Sergey Lepeshov, Jingjing Hao, Juan Liu e N. P. Yadav. "Chiral all-dielectric trimer nanoantenna". Journal of Quantitative Spectroscopy and Radiative Transfer 208 (marzo 2018): 71–77. http://dx.doi.org/10.1016/j.jqsrt.2018.01.015.

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8

Mu, Haiwei, Yu Wang, Jingwei Lv, Zao Yi, Lin Yang, Paul K. Chu e Chao Liu. "Electric field enhancement by a hybrid dielectric-metal nanoantenna with a toroidal dipole contribution". Applied Optics 61, n. 24 (15 agosto 2022): 7125. http://dx.doi.org/10.1364/ao.466124.

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Plasmonic nanocavities enable extreme light–matter interactions by pushing light down to the nanoscale. The numerical simulation is carried out systematically on the slotted Φ -shaped Si disk system with the super-dipole mode based on the analysis of the scattering strength of electric and toroidal dipoles. New blocks are introduced to the zero-field strength region of a slotted Si disk system as a function of the field enhancement factors. The far-field scattering characteristics and near-field electromagnetic field distributions are investigated by a multipole decomposition analysis to elucidate the intrinsic causes of the field enhancement. In the hybrid metal-dielectric nanoantenna, the Φ -shaped Si structure is prepared by superimposing Au nanoantennas for further field enhancement. In addition, the effects of the placement of an electric dipole emitter on the Purcell factor are derived. The geometric volume of the system is increased, and the electric field strength is improved, leading to an electric field increase of ∼ 30 . Coupling between the super-dipole mode of the dielectric nanostructure and plasmonic modes of the metallic nanoantenna produces an enhancement as large as 16 times. Our results reveal a greatly enhanced super-dipole mode by electromagnetic coupling in composite structures, which will play a significant role in enhanced nonlinear photonics, near-field enhancement spectroscopy, and strong photon–exciton coupling.

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9

Marques Lameirinhas, Ricardo A., João Paulo N. Torres e António Baptista. "A Sensor Based on Nanoantennas". Applied Sciences 10, n. 19 (29 settembre 2020): 6837. http://dx.doi.org/10.3390/app10196837.

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At the end of the XX century, a new phenomenon was discovered by Ebbesen, the extraordinary optical transmission. He reported that metallic arrays composed of nano holes, also called nanoantennas, can support resonant optical transmissions responsible by the amplification and concentration of electromagnetic radiation. Classical diffraction theories do not predict this extraordinary phenomenon. This article shows the timeline of theories that try to model the interaction between light and metal planes with slits, holes, grooves or apertures. The comparison between theories is done. Furthermore, as the optical response of these nanoantennas is dependent on the complex dielectric function, there is a high probability of successfully using these structures as sensors. This article aimed to verify how the structure parameters (periodicity, hole diameter, nanoantenna thickness and substrate thickness) can influence the optical response in order to tune the spectrum. Using a Finite Element Tool, several 3D simulations aim to conclude about the parameters influence on air–gold–quartz and air–aluminum–quartz structures, being the nanoantenna made with gold and aluminum. Moreover, all the simulations allow us to verify a resonant spectral response and the existence of great values of amplification near the metal surface. This is a clear evidence of a energy exchange due to the generation and propagation of surface plasmon polaritons. Based on the spectra taken from the parameter analysis, a specific structure was chosen to test two different sensors. A temperature sensor and a tissue detection sensor were tested and the simulations are presented. It is concluded that a nanostructure based on a nanoantenna can be used as a sensor for several applications.

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10

Zhang, Tianyue, Jian Xu, Zi-Lan Deng, Dejiao Hu, Fei Qin e Xiangping Li. "Unidirectional Enhanced Dipolar Emission with an Individual Dielectric Nanoantenna". Nanomaterials 9, n. 4 (18 aprile 2019): 629. http://dx.doi.org/10.3390/nano9040629.

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Light manipulation at the nanoscale is the vanguard of plasmonics. Controlling light radiation into a desired direction in parallel with high optical signal enhancement is still a challenge for designing ultracompact nanoantennas far below subwavelength dimensions. Here, we theoretically demonstrate the unidirectional emissions from a local nanoemitter coupled to a hybrid nanoantenna consisting of a plasmonic dipole antenna and an individual silicon nanorod. The emitter near-field was coupled to the dipolar antenna plasmon resonance to achieve a strong radiative decay rate modification, and the emitting plasmon pumped the multipoles within the silicon nanorod for efficient emission redirection. The hybrid antenna sustained a high forward directivity (i.e., a front-to-back ratio of 30 dB) with broadband operating wavelengths in the visible range (i.e., a spectral bandwidth of 240 nm). This facilitated a large library of plasmonic nanostructures to be incorporated, from single element dipole antennas to gap antennas. The proposed hybrid optical nanorouter with ultracompact structural dimensions of 0.08 λ2 was capable of spectrally sorting the emission from the local point source into distinct far-field directions, as well as possessing large emission gains introduced by the nanogap. The distinct features of antenna designs hold potential in the areas of novel nanoscale light sources, biosensing, and optical routing.

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11

Pellegrini, Giovanni, Giovanni Mattei e Paolo Mazzoldi. "Light Extraction with Dielectric Nanoantenna Arrays". ACS Nano 3, n. 9 (3 agosto 2009): 2715–21. http://dx.doi.org/10.1021/nn900481v.

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12

Gurbatov, Stanislav O., Oleg B. Vitrik e Aleksandr Kuchmizhak. "Mapping the Refractive Index of Dielectric Surfaces with Spherical Plasmonic Nanoantenna". Defect and Diffusion Forum 386 (settembre 2018): 214–18. http://dx.doi.org/10.4028/www.scientific.net/ddf.386.214.

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Here we demonstrate successful mapping the variations of the refractive index of a smooth dielectric surface by detecting spectral response of a single spherical-shape Ag nanoparticle optically aligned with a supporting optical fiber axicon microlens. We propose and examine various excitation schemes of the plasmonic nanoantenna to provide efficient interaction of its dipolar and quadrupolar modes with the underlying sample surface and to optimize the mapping resolution and sensitivity. Supporting finite-difference time-domain calculations are undertaken to tailor the interaction of the plasmonic nanoantenna and the underlying dielectric substrate upon various excitation conditions demonstrating good agreement with our experimental findings and explaining the obtained results.

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13

Feng, Tianhua, Wei Zhang, Zixian Liang e Yi Xu. "Unidirectional emission in an all-dielectric nanoantenna". Journal of Physics: Condensed Matter 30, n. 12 (27 febbraio 2018): 124002. http://dx.doi.org/10.1088/1361-648x/aaab28.

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14

Shankhwar, Nishant, Yogita Kalra, Qiang Li e Ravindra Kumar Sinha. "Zero-index metamaterial based all-dielectric nanoantenna". AIP Advances 9, n. 3 (marzo 2019): 035115. http://dx.doi.org/10.1063/1.5086234.

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15

Demirtas, Hayriye, Mustafa Turkmen, Ekin Aslan e Erdem Aslan. "Analysis of Dual-Band Plasmonic Nanoantenna with Ultra-Thin Circular Gold Layers in Visible Region". European Journal of Research and Development 2, n. 2 (7 giugno 2022): 329–37. http://dx.doi.org/10.56038/ejrnd.v2i2.73.

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Aperture-based plasmonic nanoantenna design with dual-band resonance obtained in the region very close to the green wavelength in the spectrum between 400 nm and 700 nm, which can be used in non-invasive biological sensing applications in the future, is presented. In this circular aperture-based nanoantenna design, the effect of changing the material thickness and dielectric medium parameters on the antenna response is investigated. In the nanoantenna design using a double-layer conductive gold layer, both of thickness values are reduced to 5 nm. It is observed that this thickness value exhibits a very strong transmittance response compared to the thicker gold layer values used in the visible region. In this nanoantenna, which exhibits dual band properties at 508 and 551 nm wavelengths, the strongest transmittance peaks are obtained for 5 nm thickness of gold, 100 nm thickness of magnesium fluoride and the 100 nm radius of the circular aperture. In order to contribute to spectroscopic sensing applications, hot spots locations and near field enhancement distribution maps are also examined.

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Gili, Valerio F., Lavinia Ghirardini, Davide Rocco, Giuseppe Marino, Ivan Favero, Iännis Roland, Giovanni Pellegrini et al. "Metal–dielectric hybrid nanoantennas for efficient frequency conversion at the anapole mode". Beilstein Journal of Nanotechnology 9 (27 agosto 2018): 2306–14. http://dx.doi.org/10.3762/bjnano.9.215.

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Background: Dielectric nanoantennas have recently emerged as an alternative solution to plasmonics for nonlinear light manipulation at the nanoscale, thanks to the magnetic and electric resonances, the strong nonlinearities, and the low ohmic losses characterizing high refractive-index materials in the visible/near-infrared (NIR) region of the spectrum. In this frame, AlGaAs nanoantennas demonstrated to be extremely efficient sources of second harmonic radiation. In particular, the nonlinear polarization of an optical system pumped at the anapole mode can be potentially boosted, due to both the strong dip in the scattering spectrum and the near-field enhancement, which are characteristic of this mode. Plasmonic nanostructures, on the other hand, remain the most promising solution to achieve strong local field confinement, especially in the NIR, where metals such as gold display relatively low losses. Results: We present a nonlinear hybrid antenna based on an AlGaAs nanopillar surrounded by a gold ring, which merges in a single platform the strong field confinement typically produced by plasmonic antennas with the high nonlinearity and low loss characteristics of dielectric nanoantennas. This platform allows enhancing the coupling of light to the nanopillar at coincidence with the anapole mode, hence boosting both second- and third-harmonic generation conversion efficiencies. More than one order of magnitude enhancement factors are measured for both processes with respect to the isolated structure. Conclusion: The present results reveal the possibility to achieve tuneable metamixers and higher resolution in nonlinear sensing and spectroscopy, by means of improved both pump coupling and emission efficiency due to the excitation of the anapole mode enhanced by the plasmonic nanoantenna.

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Lv, Jingwei, Xiaoming Zhang, Xuntao Yu, Haiwei Mu, Qiang Liu, Chao Liu, Tao Sun e Paul K. Chu. "Forward and Backward Unidirectional Scattering by the Core-Shell Nanocube Dimer with Balanced Gain and Loss". Nanomaterials 10, n. 8 (23 luglio 2020): 1440. http://dx.doi.org/10.3390/nano10081440.

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An optical nanoantenna consisting of a Au-dielectric core-shell nanocube dimer with switchable directionality was designed and described. Our theoretical model and numerical simulation showed that switching between forward and backward directions can be achieved with balanced gain and loss, using a single element by changing the coefficient κ in the core, which can be defined by the relative phase of the polarizability. The optical response indicated a remarkable dependence on the coefficient κ in the core as well as frequency. The location of the electric field enhancement was specified by the different coefficient κ and, furthermore, the chained optical nanoantenna and coupled electric dipole emitted to the optical nanoantenna played significant roles in unidirectional scattering. This simple method to calculate the feasibility of unidirectional and switchable scattering provides an effective strategy to explore the functionalities of nanophotonic devices.

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Xu Yue, 徐月, 董涛 Dong Tao, 贺敬文 He Jingwen e 万骞 Wan Qian. "A Miniaturized and Highly Efficient Dielectric Optical Nanoantenna". Laser & Optoelectronics Progress 55, n. 8 (2018): 080601. http://dx.doi.org/10.3788/lop55.080601.

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Malheiros-Silveira, Gilliard N., e Hugo E. Hernandez-Figueroa. "Dielectric Resonator Nanoantenna Coupled to Metallic Coplanar Waveguide". IEEE Photonics Journal 7, n. 1 (febbraio 2015): 1–7. http://dx.doi.org/10.1109/jphot.2015.2399353.

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Marino, Giuseppe, Alexander S. Solntsev, Lei Xu, Valerio F. Gili, Luca Carletti, Alexander N. Poddubny, Mohsen Rahmani et al. "Spontaneous photon-pair generation from a dielectric nanoantenna". Optica 6, n. 11 (4 novembre 2019): 1416. http://dx.doi.org/10.1364/optica.6.001416.

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Zhang, Tianyue, Xuewei Li, Jian Xu, Xiaoming Zhang, Zi-Lan Deng e Xiangping Li. "Subwavelength Silicon Nanoblocks for Directional Emission Manipulation". Nanomaterials 10, n. 6 (26 giugno 2020): 1242. http://dx.doi.org/10.3390/nano10061242.

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Manipulating the light emission direction and boosting its directivity have essential importance in integrated nanophotonic devices. Here, we theoretically propose a single dielectric silicon nanoblock as an efficient, multifunctional and ultracompact all-dielectric nanoantenna to direct light into a preferential direction. Unidirectional scattering of a plane wave as well as switchable directive emission fed by a localized emitter are demonstrated within the nanoantenna. The high directionalities are revealed to originate from a variety of mechanisms that can coexist within a single nanoblock, which contribute to the far-field radiation patterns of the outcoming light, thanks to the wealth of multipolar electric and magnetic resonances. The efficient beam redirections are also observed, which are sensitive to the local configurations of the emitter antenna coupled system. The designed antenna, with extreme geometry simplicity, ultracompact and low-loss features, could be favorable for highly sensitive sensing as well as applications in optical nanocircuits.

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Agrahari, Rajan, e Hadi K. Shamkhi. "Investigation of directivity of the nanoantenna by its inherent resonant states". Journal of Physics: Conference Series 2015, n. 1 (1 novembre 2021): 012002. http://dx.doi.org/10.1088/1742-6596/2015/1/012002.

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Abstract We present a quasinormal mode (QNM) approach for modeling the nanoantenna and describe the response of localized dielectric cylinder resonators. The inherent resonant states of the dielectric cylinder nanocavity are investigated for modified and reduced geometrical symmetry. We find some modes contributing mainly to the directivity and have a high-quality factor. The variation of the eigenmodes with cylinder height and substrate refractive index has also been investigated.

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Adl, Hamid Pashaei, Setatira Gorji, Andrés F. Gualdrón-Reyes, Iván Mora-Seró, Isaac Suárez e Juan P. Martínez-Pastor. "Enhanced Spontaneous Emission of CsPbI3 Perovskite Nanocrystals Using a Hyperbolic Metamaterial Modified by Dielectric Nanoantenna". Nanomaterials 13, n. 1 (20 dicembre 2022): 11. http://dx.doi.org/10.3390/nano13010011.

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In this work, we demonstrate, theoretically and experimentally, a hybrid dielectric-plasmonic multifunctional structure able to provide full control of the emission properties of CsPbI3 perovskite nanocrystals (PNCs). The device consists of a hyperbolic metamaterial (HMM) composed of alternating thin metal (Ag) and dielectric (LiF) layers, covered by TiO2 spherical MIE nanoresonators (i.e., the nanoantenna). An optimum HMM leads to a certain Purcell effect, i.e., an increase in the exciton radiative rate, but the emission intensity is reduced due to the presence of metal in the HMM. The incorporation of TiO2 nanoresonators deposited on the top of the HMM is able to counteract such an undesirable intensity reduction by the coupling between the exciton and the MIE modes of the dielectric nanoantenna. More importantly, MIE nanoresonators result in a preferential light emission towards the normal direction to the HMM plane, increasing the collected signal by more than one order of magnitude together with a further increase in the Purcell factor. These results will be useful in quantum information applications involving single emitters based on PNCs together with a high exciton emission rate and intensity.

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Huang, Dengchao, Shilin Liu e Kang Yang. "Highly Unidirectional Radiation Enhancement Based on a Hybrid Multilayer Dimer". Nanomaterials 12, n. 4 (21 febbraio 2022): 710. http://dx.doi.org/10.3390/nano12040710.

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Dimers made of plasmonic particles support strong field enhancements but suffer from large absorption losses, while low-loss dielectric dimers are limited by relatively weak optical confinement. Hybrid dimers could utilize the advantages of both worlds. Here, we propose a hybrid nanoantenna that contains a dimer of core-dual shell nanoparticles known as the metal–dielectric–metal (MDM) structure. We discovered that the hybrid dimer sustained unidirectional forward scattering, which resulted in a nearly ideal Kerker condition in the frequency close to the resonance peak of the dimer due to enhancing the amplitude of the induced high-order electric multiples in the gap and effectively superimposing them with magnetic ones, which respond to the excitation of the plane wave in the dielectric layer of the dimer. Furthermore, when an electric quantum emitter is coupled to the dimer, our study shows that the optimal hybrid dimer simultaneously possesses high radiation directivity and low-loss features, which illustrates a back-to-front ratio of radiation 53 times higher than that of the pure dielectric dimer and an average radiation efficiency 80% higher than that of the pure metallic dimer. In addition, the unique structures of the hybrid hexamer direct almost decrease 75% of the radiation beamwidth, hence heightening the directivity of the nanoantenna based on a hybrid dimer.

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Zalogina, Anastasiia, Javid Javadzade, Roman Savelev, Filipp Komissarenko, Alexander Uvarov, Ivan Mukhin, Ilya Shadrivov, Alexey Akimov e Dmitry Zuev. "Control of photoluminescence of nitrogen-vacancy centers embedded in diamond nanoparticles coupled to silicon nanoantennas". Applied Physics Letters 122, n. 10 (6 marzo 2023): 101101. http://dx.doi.org/10.1063/5.0133866.

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The development of nanophotonics systems for the manipulation of luminescent properties of single quantum emitters is essential for quantum communication and computing. Dielectric nanosystems enable various opportunities for light control through inherent electric and magnetic resonances; however, their full potential has not yet been discovered. Here, emission properties of nitrogen-vacancy (NV) centers in nanodiamonds placed in the near-field zone of silicon nanoresonators are investigated. It is demonstrated experimentally that the spontaneous emission rate of single NV centers in 50 nm nanodiamonds can be modified by their coupling to spherical nanoantennas, reducing the mode of the lifetime distribution by [Formula: see text] times from 16 to 9 ns. It is also shown that the collected intensity of photoluminescence emission from multiple NV centers in a 150 nm nanodiamond coupled to a cylindrical nanoantenna is increased by more than 50% compared to the intensity from the same nanodiamond on a bare substrate.

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Mohan, Anand. "DIELECTRIC OPTICAL ANTENNA: A NEW CONCEPT FOR MICROWAVE FREQUENCIES". Information Management and Computer Science 3, n. 2 (7 dicembre 2020): 27–29. http://dx.doi.org/10.26480/imcs.02.2020.27.29.

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The dielectric optical antenna operating band is used to enhance bandwidth of operation band. The dielectric resonator antenna has high permittivity. The capabilities of antenna depend on made-up materials. Antenna range plays very important role for transmission of radio-signals. The properties of antenna play very important role in any technical or communicational devices. Current communication system requires high level portable communicational devices. Nanoantenna has high level configurable conductor power to help to change specific feature. Optical antenna has great capability to connect one network another network . The specific feature of optical antenna moving around development of our life to give convenient life. Only advanced generation technology has power to change our simple life to advanced technological life. In this research paper we have introduced new technical idea to develop our brain to gain high level efficiency to controlled our system with helps of antenna full usability for human being .The antenna characteristics depends on permittivity , dimension, properties limiting factors, geometrical properties, shape, model, wavelength scale and intensity of antenna aperture wavelength, which incident radiation relates to its design . In this paper we apply maxwell equations for free space propagation, as well as solve its amplitude of phase future plasmonic integrated circuits will be capable to extremely high range data processing at optical domain, the optical frequencies will be controlled by efficient optical emission of plasmonic antenna. In this project the new concept of microwave range arrays is applied to convert plasmonic optical antenna array, with nano-coupled plasmonic wave guide, as a spatial filter to absorb a specific wave length at particular specified incident angle. Nanoantenna transmits optical signals on nanometre scale. Optical nanoantenna are expected to radiate in THZ or GHZ frequency range. Optical DRA antenna has very unique and key application for such types of device based configuration .The optical DRA –antenna has unique spectral ability to optimize as well as design in nanometre scale.

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27

Yan, Jiahao, Churong Ma, Pu Liu, Chengxin Wang e Guowei Yang. "Electrically Controlled Scattering in a Hybrid Dielectric-Plasmonic Nanoantenna". Nano Letters 17, n. 8 (11 luglio 2017): 4793–800. http://dx.doi.org/10.1021/acs.nanolett.7b01566.

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28

Malheiros-Silveira, Gilliard N., e Hugo E. Hernández-Figueroa. "Wireless optical coupling evaluation in a dielectric resonator nanoantenna". OSA Continuum 1, n. 3 (16 ottobre 2018): 805. http://dx.doi.org/10.1364/osac.1.000805.

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29

Tapar, Jinal, Saurabh Kishen e Naresh Kumar Emani. "Generalized Kerker effect in PT-symmetric nanoantenna array". Journal of Optics 24, n. 3 (28 gennaio 2022): 034003. http://dx.doi.org/10.1088/2040-8986/ac486f.

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Abstract All-dielectric nanophotonics is a rapidly developing and practical alternative to plasmonics for nanoscale optics. The electric and magnetic Mie resonances in high-index low-loss dielectric nanoresonators can be engineered to exhibit unique scattering responses. Recently, nanophotonic structures satisfying parity-time (PT) symmetry have been shown to exhibit novel scattering responses beyond what can be achieved from the conventional nanoresonators. The complex interference of the magnetic and electric Mie resonances and lattice modes excited in PT-symmetric nanoantenna arrays give rise to a scattering anomaly called lasing spectral singularity (SS), where the scattering coefficients tend to infinity. In our previous work (Tapar, Kishen and Emani 2020 Opt. Lett. 45 5185), we demonstrated the existence of lasing SSs in vertically stacked two-dimensional (2D) GaInP PT-symmetric metasurface. In this paper, we analyse the direction-sensitive scattering response of the PT-symmetric GaInP metasurface by decomposing the total scattered field into the electric and magnetic multipoles. The far-field scattering response at the singularity is highly asymmetric for incidence from either the gain or loss side and can be tuned by changing the geometry. By analysing the phase of even- and odd-parity higher-order multipoles, we explain the observed scattering response over a broad parameter space in terms of the generalized Kerker effect. The interference between the direction-dependent excitation of different order multipoles and the overall 2D-lattice resonance opens a route towards designing a special class of tunable sources exhibiting direction-sensitive emission properties.

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30

Terekhov, P. D., H. K. Shamkhi, E. A. Gurvitz, K. V. Baryshnikova, A. B. Evlyukhin, A. S. Shalin e A. Karabchevsky. "Broadband forward scattering from dielectric cubic nanoantenna in lossless media". Optics Express 27, n. 8 (4 aprile 2019): 10924. http://dx.doi.org/10.1364/oe.27.010924.

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31

Qin, Feifei, Dasen Zhang, Zhenzhen Liu, Qiang Zhang e Junjun Xiao. "Designing metal-dielectric nanoantenna for unidirectional scattering via Bayesian optimization". Optics Express 27, n. 21 (11 ottobre 2019): 31075. http://dx.doi.org/10.1364/oe.27.031075.

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32

Sugimoto, Hiroshi, e Minoru Fujii. "Broadband Dielectric–Metal Hybrid Nanoantenna: Silicon Nanoparticle on a Mirror". ACS Photonics 5, n. 5 (23 marzo 2018): 1986–93. http://dx.doi.org/10.1021/acsphotonics.7b01461.

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33

Zhang, Xiaoming, Jun-Jun Xiao, Qiang Zhang, Feifei Qin, Xingmin Cai e Fan Ye. "Dual-Band Unidirectional Emission in a Multilayered Metal–Dielectric Nanoantenna". ACS Omega 2, n. 3 (3 marzo 2017): 774–83. http://dx.doi.org/10.1021/acsomega.7b00121.

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34

ZHANG, TAIPING, ALI BELAROUCI, SÉGOLÈNE CALLARD, PEDRO ROJO ROMEO, XAVIER LETARTRE e PIERRE VIKTOROVITCH. "PLASMONIC-PHOTONIC HYBRID NANODEVICE". International Journal of Nanoscience 11, n. 04 (agosto 2012): 1240019. http://dx.doi.org/10.1142/s0219581x12400194.

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Abstract (sommario):

We propose and demonstrate a hybrid cavity system in which an optical nanoantenna (NA) is evanescently coupled to a dielectric photonic crystal (PC) cavity. While the plasmonic component leads to strongly localized fields, photon storage mechanism is provided by the surrounding photonic crystal structure. The combined effect of plasmonic field enhancement and high quality factor opens new routes for the control of light-matter interaction at the nanoscale.

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35

Xu, Lei, Mohsen Rahmani, Daria Smirnova, Khosro Zangeneh Kamali, Guoquan Zhang, Dragomir Neshev e Andrey Miroshnichenko. "Highly-Efficient Longitudinal Second-Harmonic Generation from Doubly-Resonant AlGaAs Nanoantennas". Photonics 5, n. 3 (17 settembre 2018): 29. http://dx.doi.org/10.3390/photonics5030029.

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Abstract (sommario):

We design an asymmetric nonlinear optical nanoantenna composed of a dielectric nanodisc and an adjacent nanobar. The proposed composite structure made of AlGaAs exhibits resonant response at both the fundamental and doubled frequencies. Being driven by the strong magnetic dipole resonance at the pump wavelength and a high-quality mode at the harmonic wavelength, the efficient second-harmonic radiation is generated predominantly along the vertical directions under the normally incident plane-wave excitation.

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36

Sun, Song, Mo Li, Qingguo Du, Ching Eng Png e Ping Bai. "Metal–Dielectric Hybrid Dimer Nanoantenna: Coupling between Surface Plasmons and Dielectric Resonances for Fluorescence Enhancement". Journal of Physical Chemistry C 121, n. 23 (7 giugno 2017): 12871–84. http://dx.doi.org/10.1021/acs.jpcc.7b02593.

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37

Kandasamy, Senthil Kumar, S. Maheswaran, S. Anbu Karuppusamy, J. Indra, R. Anand, P. Rega, A. Kavitha, K. Immanuvel Arokia James, Kasthuri Nehru e K. Kathiresan. "Design and Fabrication of Flexible Nanoantenna-Based Sensor Using Graphene-Coated Carbon Cloth". Advances in Materials Science and Engineering 2022 (8 settembre 2022): 1–7. http://dx.doi.org/10.1155/2022/2265904.

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Carbon nanomaterials have attracted significant consideration and concern due to the unique chemical and physical properties. Recently, nanodiamonds, graphene, and carbon nanotubes are served as electrodes, hydrogen storage elements, and composite materials. In this work, a 5 GHz graphene nanoantenna that falls inside the very-small-aperture terminal (VSAT) C-band range has been fabricated. A graphene substrate with a thickness of h = 0.5 cm is formed which is then used for fabricating a graphene nanoantenna working at 5 GHz. To design and simulate the antenna, Analysis System (ANSYS) electromagnetic desktop software was used. Using the designed graphene antenna, the parameters such as voltage standing wave ratio, three-dimensional radiation pattern, and directivity were obtained. After designing of the antenna using ANSYS software, it was physically fabricated. The graphene was used as a dielectric, copper sheet acted as a patch over as well as ground. Finally, the design was testedusing Vector Network Analyzer (Model: N9925A) and the transmission range was found as 5 GHz.

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38

Liu, Pengbo, Zhenghe Zhang, Man Lang, Wanli Lu, Ping Bai, Zefeng Chen, Shaojun Wang e Xiaofeng Li. "Manipulating the directional emission of monolayer semiconductors by dielectric nanoantenna arrays". Journal of Optics 24, n. 2 (4 gennaio 2022): 024005. http://dx.doi.org/10.1088/2040-8986/ac431a.

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Abstract Collective Mie resonances in silicon (Si) nanoparticle arrays (NPAs) feature low absorption losses and strong field enhancement extending to a large area. They provide a high-efficient scheme to manipulate the emission properties of monolayer semiconductors. However, the poor quality factor of the current reported Si NPA limits the performance of light-emitting devices. It is mainly due to the constituent materials of nanoparticles being amorphous or polycrystalline Si, which have higher absorption coefficients in comparison with monocrystalline silicon (c-Si) among the visible band. This invited paper demonstrates a versatile technique to integrate the atomic layers onto the c-Si NPA. We show that our method can fully preserve the monolayer sample. We further investigate the directional emission tailored by the NPA with different diameters by combining back-focal-plane imaging and reciprocity simulations. The flexible tune of the geometry parameters of NPAs can offer many possibilities to control and manipulate the emission from monolayer semiconductors by engineering their photonic environments.

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39

Sun, Yali, Vitaly Yaroshenko, Alexander Chebykin, Eduard Ageev, Sergey Makarov e Dmitry Zuev. "Metal-dielectric nanoantenna for radiation control of a single-photon emitter". Optical Materials Express 10, n. 1 (2 dicembre 2019): 29. http://dx.doi.org/10.1364/ome.10.000029.

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40

Wu, Jing, e Hossein Mosallaei. "Engineered Dielectric Pattern Nanoantenna: A Quantum Cascade Laser (QCL) Device Application". IEEE Transactions on Antennas and Propagation 59, n. 1 (gennaio 2011): 32–39. http://dx.doi.org/10.1109/tap.2010.2090480.

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41

Thoreson, Mark D., Alexander V. Kildishev e Vladimir M. Shalaev. "Translation of nanoantenna hot spots by a metal-dielectric composite superlens". Applied Physics Letters 95, n. 3 (20 luglio 2009): 033114. http://dx.doi.org/10.1063/1.3176975.

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42

Deng, Yan-Hui, Zhong-Jian Yang e Jun He. "Plasmonic nanoantenna-dielectric nanocavity hybrids for ultrahigh local electric field enhancement". Optics Express 26, n. 24 (12 novembre 2018): 31116. http://dx.doi.org/10.1364/oe.26.031116.

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43

Dyshlyuk, A. V., A. A. Bogdanov e O. B. Vitirk. "Excitation of surface plasmon waves with a nanoantenna: simple analytical solution and its numerical verification". Computer Optics 44, n. 6 (dicembre 2020): 893–900. http://dx.doi.org/10.18287/2412-6179-co-755.

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Abstract (sommario):

In this work, we demonstrate a simple analytical approach to the problem of surface plasmon polaritons excitation with a metallic nanoantenna placed above a metal surface. The method uses the reciprocity theorem and is similar to the calculation of amplitudes of dielectric waveguide modes excited by a current distribution. To maximize clarity of the demonstration, we formulate the problem in a simple two-dimensional geometry. The analytical results are shown to agree well with the numerical solution obtained by finite elements in frequency domain and finite difference in time domain methods.

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44

Wang Han, 王晗, 臧昊峰 Zang Haofeng, 鲁拥华 Lu Yonghua e 王沛 Wang Pei. "Mode Properties and Fluorescence Emission Mediation of Metal-Dielectric-Metal Nanoantenna Array". Acta Optica Sinica 40, n. 4 (2020): 0426001. http://dx.doi.org/10.3788/aos202040.0426001.

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45

Yao, Kan, e Yuebing Zheng. "Controlling the polarization of chiral dipolar emission with a spherical dielectric nanoantenna". Journal of Chemical Physics 155, n. 22 (14 dicembre 2021): 224110. http://dx.doi.org/10.1063/5.0072210.

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46

Davies, D. G., D. M. Whittaker e L. R. Wilson. "Hybrid gold nanoantenna array—Dielectric thin film anti-reflection coatings on GaAs". Solid State Communications 152, n. 24 (dicembre 2012): 2156–59. http://dx.doi.org/10.1016/j.ssc.2012.09.016.

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47

Cambiasso, Javier, Matthias König, Emiliano Cortés, Sebastian Schlücker e Stefan A. Maier. "Surface-Enhanced Spectroscopies of a Molecular Monolayer in an All-Dielectric Nanoantenna". ACS Photonics 5, n. 4 (20 febbraio 2018): 1546–57. http://dx.doi.org/10.1021/acsphotonics.7b01604.

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48

Ngo, Quang Minh, Ying-Lung D. Ho, Jon R. Pugh, Andrei Sarua e Martin J. Cryan. "Enhanced UV/blue fluorescent sensing using metal-dielectric-metal aperture nanoantenna arrays". Current Applied Physics 18, n. 7 (luglio 2018): 793–98. http://dx.doi.org/10.1016/j.cap.2018.04.007.

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49

Decker, M., T. Pertsch e I. Staude. "Strong coupling in hybrid metal–dielectric nanoresonators". Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 375, n. 2090 (28 marzo 2017): 20160312. http://dx.doi.org/10.1098/rsta.2016.0312.

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Abstract (sommario):

We study resonant photonic–plasmonic coupling between a gold dipole nanoantenna and a silicon nanodisc supporting electric and magnetic dipolar Mie-type resonances. Specifically, we consider two different cases for the mode structure of the silicon nanodisc, namely spectrally separate and spectrally matching electric and magnetic dipolar Mie-type resonances. In the latter case, the dielectric nanoparticle scatters the far fields of a unidirectional Huygens’ source. Our results reveal an anticrossing of the plasmonic dipole resonance and the magnetic Mie-type dipole resonance of the silicon nanodisc, accompanied by a clear signature of photonic–plasmonic mode hybridization in the corresponding mode profiles. These characteristics show that strong coupling is established between the two different resonant systems in the hybrid nanostructure. Furthermore, our results demonstrate that in comparison with purely metallic or dielectric nanostructures, hybrid metal–dielectric nanoresonators offer higher flexibility in tailoring the fractions of light which are transmitted, absorbed and reflected by the nanostructure over a broad range of parameters without changing its material composition. As a special case, highly asymmetric reflection and absorption properties can be achieved. This article is part of the themed issue ‘New horizons for nanophotonics’.

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Buhara, Ebru, Amir Ghobadi, Bahram Khalichi, Hasan Kocer e Ekmel Ozbay. "Mid-infrared adaptive thermal camouflage using a phase-change material coupled dielectric nanoantenna". Journal of Physics D: Applied Physics 54, n. 26 (23 aprile 2021): 265105. http://dx.doi.org/10.1088/1361-6463/abf53d.

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