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Journal articles on the topic 'Structural parameter of refractive index'

Author: Grafiati

Published: 28 June 2021

Last updated: 29 July 2025

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1

Lionis, Antonios, Konstantinos Peppas, Hector E. Nistazakis, Andreas Tsigopoulos, Keith Cohn, and Kyle R. Drexler. "Supervised Machine Learning for Refractive Index Structure Parameter Modeling." Quantum Beam Science 7, no. 2 (2023): 18. http://dx.doi.org/10.3390/qubs7020018.

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The Hellenic Naval Academy (HNA) reports the latest results from a medium-range, near-maritime, free-space laser-communications-testing facility, between the lighthouse of Psitalia Island and the academy’s laboratory building. The FSO link is established within the premises of Piraeus port, with a path length of 2958 m and an average altitude of 35 m, mainly above water. Recently, the facility was upgraded through the addition of a BLS450 scintillometer, which is co-located with the MRV TS5000/155 FSO system and a WS-2000 weather station. This paper presents the preliminary optical turbulence

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Prajapati, A. N. "Study of Molecular Interaction in Binary Mixtures (1-Propanol + Acetophenone)." Advanced Materials Research 1141 (August 2016): 125–30. http://dx.doi.org/10.4028/www.scientific.net/amr.1141.125.

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Studies on Physico-chemical properties of binary liquid mixtures provide information on the nature of interactions between the constituent of the binaries. Literature provides extensive data on the static dielectric constant (ε0) and refractive index (n) of liquid compounds, but the combined study of all is quite scarce. In the present work static dielectric constant (ε0) and refractive index (n) have been experimentally determined for binary liquid mixture of 1-Propanol (PrOH) with Acetophenone (ACP) over the entire concentration range of mixture composition (0.0 →1.0) at constant temperature

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3

Yu, Jing, Tingting Lang, and Huateng Chen. "All-Metal Terahertz Metamaterial Absorber and Refractive Index Sensing Performance." Photonics 8, no. 5 (2021): 164. http://dx.doi.org/10.3390/photonics8050164.

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This paper presents a terahertz (THz) metamaterial absorber made of stainless steel. We found that the absorption rate of electromagnetic waves reached 99.95% at 1.563 THz. Later, we analyzed the effect of structural parameter changes on absorption. Finally, we explored the application of the absorber in refractive index sensing. We numerically demonstrated that when the refractive index (n) is changing from 1 to 1.05, our absorber can yield a sensitivity of 74.18 μm/refractive index unit (RIU), and the quality factor (Q-factor) of this sensor is 36.35. Compared with metal–dielectric–metal san

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4

Fouda, I. M., M. A. Kabeel, and F. M. El-Sharkawy. "Opto-Thermal Properties of Fibres. Part 2: Investigation of Optical Parameter Changes in Annealed and Quenched Nylon 6-6." Engineering Plastics 5, no. 6 (1997): 147823919700500. http://dx.doi.org/10.1177/147823919700500604.

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The changes in refractive indices and birefringence of nylon 6-6 fibres with different annealing conditions were” studied by interferometry. The polarizing interference microscope was used to determine the mean refractive indices and mean birefringence of these fibres. Also, an acoustic method has been used to measure densities. The results are used to calculate some structural parameters such as the form birefringence, virtual refractive index, harmonic mean polarisability of the dielectric, and the specific refractivity of the isotropic dielectric. Also, the number of monomer units per unit

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5

Fouda, I. M., M. A. Kabeel, and F. M. El-Sharkawy. "Opto-Thermal Properties of Fibres. Part 2: Investigation of Optical Parameter Changes in Annealed and Quenched Nylon 6-6." Polymers and Polymer Composites 5, no. 6 (1997): 431–41. http://dx.doi.org/10.1177/096739119700500604.

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The changes in refractive indices and birefringence of nylon 6-6 fibres with different annealing conditions were” studied by interferometry. The polarizing interference microscope was used to determine the mean refractive indices and mean birefringence of these fibres. Also, an acoustic method has been used to measure densities. The results are used to calculate some structural parameters such as the form birefringence, virtual refractive index, harmonic mean polarisability of the dielectric, and the specific refractivity of the isotropic dielectric. Also, the number of monomer units per unit

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6

Ciocirlan, Oana, and Olga Iulian. "Density, viscosity and refractive index of the dimethyl sulfoxide + o-xylene system." Journal of the Serbian Chemical Society 74, no. 3 (2009): 317–29. http://dx.doi.org/10.2298/jsc0903317c.

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This work reports the experimental results of the densities, viscosities and refractive indices between 298.15 and 323.15 K of the dimethyl sulfoxide + o-xylene system over the entire composition range of the mixtures. The excess molar volumes (VE), viscosity deviations (?v), excess Gibbs energy of activation of viscous flow (G*E) and deviations in the refraction (?R) were calculated from the experimental data; all the computed quantities were fitted to the Redlich-Kister equation. The system exhibits moderate negative values for the investigated excess properties. The resulting excess functio

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Hussein, Ahang M., Elham M. A. Dannoun, Shujahadeen B. Aziz, et al. "Steps Toward the Band Gap Identification in Polystyrene Based Solid Polymer Nanocomposites Integrated with Tin Titanate Nanoparticles." Polymers 12, no. 10 (2020): 2320. http://dx.doi.org/10.3390/polym12102320.

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In the current study, the film fabrication of polystyrene (PS) based polymer nanocomposites (NCs) with tuned refractive index and absorption edge was carried out using the solution cast method. X-ray diffraction (XRD) and ultraviolet-visible (UV-Vis) light characterization techniques were performed. The structural and optical properties of the prepared films were specified. The hump of PS decreased significantly when SnTiO3 nanoparticles (NPs) were introduced. Sharp and high intense peaks of SnTiO3 NPs at a high filler ratio were observed. The crystalline size was determined for SnTiO3 NPs fro

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Liu, Yan Jun, and Tong Dai. "Investigation on Dispersion Property of a Novel Photonic Crystal Fiber with Square Array Air Holes." Advanced Materials Research 571 (September 2012): 278–82. http://dx.doi.org/10.4028/www.scientific.net/amr.571.278.

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The dispersion property of a novel photonic crystal fiber with square array air holes was simulated with the vectorial beam propagation method. The impacts of the pitch and hole diameter on the effective area of fundamental mode and the dispersion parameter were evaluated. The results indicate that the effective refractive index decreases and the dispersion parameter increases with air hole diameter increasing and the pitch decreasing, the structure parameters of inner three rings air hole influences the dispersion characteristics greatly. Thus the dispersion property of the photonic crystal f

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9

Shruti, Geete *1 Vikas Sahu 2. "ANALYSIS OF EFFECTIVE AREA OF FM-MCF WHEN DOPED WITH DIFFERENT LIQUIDS." INTERNATIONAL JOURNAL OF ENGINEERING SCIENCES & RESEARCH TECHNOLOGY 8, no. 7 (2019): 105–10. https://doi.org/10.5281/zenodo.3339319.

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This paper is the analysis of effective area of the Multicore fiber when the structural parameter like wavelength is varied between 1.32µm to 1.54µm. Different structures of the MCF are used for this analysis viz., hexagonal, octagonal and decagonal structure. The analysis is done by doping few inner ring holes of the MCF with different liquids having refractive index lower than that of the actual core. The software used for this process is COMSOL Multiphysics and the graphs are plotted using MATLAB. It has been noted that by varying structural parameters change in effective area i

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10

Odegov, Nikolay Anatoliyovich, Iryna Oleksandrivna Hlushchenko, and Vitaliy Olehovich Duridivka. "Phenomenological models of the main characteristics of a step optical fiber." Problemi telekomunìkacìj, no. 1(26) (December 11, 2020): 33–47. http://dx.doi.org/10.30837/pt.2020.1.03.

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The paper considers a group of polynomial models of various characteristics of an optical fiber (OF) depending on the wavelength and chemical composition of the fiber. A method for structural identification of such models is proposed. The following characteristics are considered: the refractive index of the fiber core and cladding, group refractive index, group velocity, dispersion coefficients, numerical aperture, cutoff wavelength of the fundamental mode, etc. An analysis of the well-known Cauchy, Lorentz-Lorenz equations, Sellmeier’s formulas, etc. is given in relation to the problem being

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11

Fouda, I. M. "Changes in Opto-Thermal Properties of PET Fibres during Annealing." Engineering Plastics 6, no. 8 (1998): 147823919800600. http://dx.doi.org/10.1177/147823919800600803.

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The changes in refractive indices and the birefringence of polyester (Egyptian PET) fibres with different annealing conditions were studied by interferometry. The polarizing interference microscope was used to determine the mean refractive indices and mean birefringence of these fibres. An acoustic method has been used to measure densities. The results are used to calculate structural parameters such as the form birefringence, virtual refractive index, harmonic mean polarizability of the dielectric, the number of molecules per unit volume, and the specific refractivity of the isotropic dielect

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12

Fouda, I. M. "Changes in Opto-Thermal Properties of PET Fibres during Annealing." Polymers and Polymer Composites 6, no. 8 (1998): 513–22. http://dx.doi.org/10.1177/096739119800600803.

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The changes in refractive indices and the birefringence of polyester (Egyptian PET) fibres with different annealing conditions were studied by interferometry. The polarizing interference microscope was used to determine the mean refractive indices and mean birefringence of these fibres. An acoustic method has been used to measure densities. The results are used to calculate structural parameters such as the form birefringence, virtual refractive index, harmonic mean polarizability of the dielectric, the number of molecules per unit volume, and the specific refractivity of the isotropic dielect

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13

Sakiroglu, S. "Linear and nonlinear optical absorption coefficients and refractive index changes in Morse quantum wells under electric field." International Journal of Modern Physics B 30, no. 30 (2016): 1650209. http://dx.doi.org/10.1142/s021797921650209x.

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In this paper, we investigate theoretically the effects of electric field on the linear and nonlinear optical properties of Morse quantum wells considering a two-level system. The effective mass approximation and the envelope function approach are used to calculate the energy levels and wave functions. The analytical expressions of the optical properties are obtained by using the compact density-matrix approach. The linear and third-order nonlinear optical absorption coefficients and the refractive index changes are investigated as a function of the incident photon energy for several configura

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14

Michihata, Masaki, Deqing Kong, Kiyoshi Takamasu, and Satoru Takahashi. "A Simulation Study of Plasmonic Substrate for In-Process Measurement of Refractive Index in Nano-Stereolithography." International Journal of Automation Technology 11, no. 5 (2017): 772–80. http://dx.doi.org/10.20965/ijat.2017.p0772.

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Functional surfaces are in demand for recent value-added products. Stereolithography based on evanescent light has been proposed as a technique to fabricate surface nanostructures, but some fabrication error sources must be addressed. In-process measurement is an essential solution to improve the fabrication performance. For in-process measurement in stereolithography, the refractive index of resin is an inherent parameter for product and condition monitoring. This study proposes the in-process measurement of the refractive index of resin based on surface plasmon resonance (SPR). The optical p

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15

Zhang, Ji Yan, Wen Li Liu, Lei Yang, and Ming Liang Gao. "Analysis on Refractive Property of Complex Optometry System." Applied Mechanics and Materials 668-669 (October 2014): 1565–68. http://dx.doi.org/10.4028/www.scientific.net/amm.668-669.1565.

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In optometry, simplified models are usually used to analyze refractive property of optometry system on the assumption that lenses are thin and close enough to each other. However, in fact those lenses do have stated center thickness and lens space between them. The simplified models are not suitable for accurate analysis and system design. In this paper, first, accurate mathematic model for refractive property of single spherical and cylindrical lens is established. Next, accurate model is established for complex optometry system with different kinds of lenses combination. Then, influence fact

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Mekhnache, Mounira, Hayet Benzarouk, and Abdelaziz Drici. "Structural, linear and non-linear optical properties of Cr-doped ZnO thin film for optoelectronics applications." International Journal of Materials Research 112, no. 2 (2021): 150–57. http://dx.doi.org/10.1515/ijmr-2020-7977.

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Abstract In this work, optical properties of undoped zinc oxide (ZnO) and chromium (Cr) doped ZnO prepared at different concentrations of Cr (2, 3, and 5 wt.%) on glass substrates by a spray pyrolysis method are reported. The structural properties investigated by X-ray diffraction revealed the hexagonal wurtzite structure, noting that the crystallite size of the films decreases with increasing Cr content. The optical characterization of the samples was carried out using spectral transmittance. The refractive index, energy gap, and extinction coefficient of pure and Cr-doped ZnO thin films have

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17

Dhanya, I., and C. S. Menon. "Effect of Thickness on Structural and Optical Properties of Tetra-tert- butyl-2, 3-naphthalocyanine Thin Films." E-Journal of Chemistry 8, no. 4 (2011): 1686–95. http://dx.doi.org/10.1155/2011/752982.

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Amorphous tetra-tert-butyl-2, 3-naphthalocyanine thin films have been deposited using physical vapor deposition technique under a varied thickness by adjusting the coating time. By analyzing the x-ray diffraction, the structure of as deposited films is found to be non-crystalline. Different optical properties of these thin films have been investigated by means of optical absorption and reflection spectra. Various optical constants like band gap energy, Egthe width of band tails of localized states into the gap, EUand steepness parameter, β gets calculated and the variation of different optical

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18

Chen, Ying, Xinbei Gao, Pei Luo, Yangmei Xu, Jinggang Cao, and Jinchao Xie. "Sensing mechanism analysis on one-dimensional photonic crystal with air slot-porous silicon-air slot F–P cavity." Modern Physics Letters B 33, no. 13 (2019): 1950159. http://dx.doi.org/10.1142/s0217984919501598.

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Based on the evanescent wave resonance, a photonic crystal sensing structure with air slot-porous silicon-air slot Fabry–Perot cavity (F–P cavity) is proposed. Taking the F–P cavity as the sensing unit, when the gas to be detected is filled into the sensing unit, the refractive index of the air slot will be changed and the refractive index of the porous silicon layer will also be varied, both of which will shift the resonant peak and greatly increase the sensitivity of the sensor. By adjusting the structural parameters, the quality factor (Q value) can be optimized. A model for the relationshi

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19

Wang, Fengmin, Yong Wei, and Yanhong Han. "High Sensitivity and Wide Range Refractive Index Sensor Based on Surface Plasmon Resonance Photonic Crystal Fiber." Sensors 23, no. 14 (2023): 6617. http://dx.doi.org/10.3390/s23146617.

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In order to detect the refractive index (RI) of high refractive index materials such as trichlorobenzene and aniline in the near-infrared and mid-infrared spectra and expand the detection range of the refractive index, a surface plasmon resonance (SPR) photonic crystal fiber (PCF) sensor based on an elliptical sensing channel is proposed for high refractive index detection. The fiber core and the analyte channel are surrounded by two types of air holes with different sizes. When the surface plasmon resonance effect appears at the interface between the fiber core and the elliptical sensing laye

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20

Wu, Tiesheng, Yumin Liu, Zhongyuan Yu, et al. "Tuning the Fano resonances in a single defect nanocavity coupled with a plasmonic waveguide for sensing applications." Modern Physics Letters B 29, no. 33 (2015): 1550218. http://dx.doi.org/10.1142/s0217984915502188.

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A novel surface plasmon polaritons (SPPs) refractive index sensor based on a single defect nanocavity coupled with a metal–insulator–metal (MIM) waveguide is proposed and numerically simulated by using the finite difference time domain (FDTD) method with perfectly matched layer absorbing boundary condition. It is found that the defect structure can realize two Fano resonances and these two Fano resonances originate from two different mechanisms. The results demonstrate the liner correlation between the resonance wavelengths of the device and the refractive index of the material under sensing.

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Aziz, Shujahadeen B., Elham M. A. Dannoun, Dana A. Tahir, et al. "Synthesis of PVA/CeO2 Based Nanocomposites with Tuned Refractive Index and Reduced Absorption Edge: Structural and Optical Studies." Materials 14, no. 6 (2021): 1570. http://dx.doi.org/10.3390/ma14061570.

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In the current study, polymer nanocomposites (NCPs) based on poly (vinyl alcohol) (PVA) with altered refractive index and absorption edge were synthesized by means of a solution cast technique. The characterization techniques of UV–Vis spectroscopy and XRD were used to inspect the structural and optical properties of the prepared films. The XRD patterns of the doped samples have shown clear amendments in the structural properties of the PVA host polymer. Various optical parameters were studied to get more insights about the influence of CeO2 on optical properties of PVA. On the insertion of Ce

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ATUCHIN, V. V., V. SH ALIEV, B. M. AYUPOV, and I. V. KOROLKOV. "DECREASED REFRACTIVE INDEX OF NANOCRYSTALLINE ZIRCONIUM OXIDE THIN FILMS." International Journal of Modern Physics B 26, no. 02 (2012): 1250012. http://dx.doi.org/10.1142/s0217979211102101.

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Amorphous zirconium oxide (a- ZrO 2) thin films were prepared onto fuzzed quartz substrates by ion beam sputtering deposition (IBSD) method in ( Ar + O 2) gas mixture. Optical parameters of the films were evaluated by laser ellipsometry (λ = 632.8 nm ) and optical transmission measurements. Structural parameters were studied by XRD measurements. Variation of refractive index and film thickness have been defined as a function of time of high-temperature annealing at T = 900° C . Formation of monoclinic zirconium oxide (m- ZrO 2) nanocrystals with diameter of ~60 nm embedded into a- ZrO 2 matrix

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23

Yin, Zhiyong, Xili Jing, Yuhui Feng, Zhigang Gao, Biao Wu, and Chengjun Wang. "Refractive index and temperature dual parameter sensor based on a twin-core photonic crystal fiber." Journal of Physics D: Applied Physics 55, no. 15 (2022): 155108. http://dx.doi.org/10.1088/1361-6463/ac472b.

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Abstract A twin-core photonic crystal fiber sensor is proposed for measuring liquid refractive index (RI) and temperature simultaneously. The air holes of the sensor are arranged in a hexagonal pattern, and two planes are introduced by polishing in the cladding. On one side of the plane, the gold film is deposited for RI measurement, and on the other side, the gold film and polydimethylsiloxane are deposited for temperature measurement. We analyzed its sensing characteristics by using the finite element method. The numerical results show that the two channels for measuring RI and temperature h

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WANG JunHui, LI Deqiong, NIE GuoZheng, et al. "Near-infrared high-Q all-dielectric metasurface biosensor based on quasi-bound state in the continuum." Acta Physica Sinica 74, no. 10 (2025): 0. https://doi.org/10.7498/aps.74.20241752.

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In recent years, bound states in the continuum (BICs) have become a hot research topic because of their strong ability to facilitate light-matter interactions, an ideal platform for realizing optical resonances with ultra-high quality factors (Q). Nowadays, BICs have been found in various photonic micro- and nanostructures such as waveguides, gratings, and metasurfaces, among which metasurfaces have attracted much attention due to their easy tunability and considerable robustness. Conventional precious metal-based metasurfaces inevitably have low Q-factors due to the inherent defect of high oh

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ARASU, P. ADAL, and R. VICTOR WILLIAMS. "EFFECT OF ANNEALING TEMPERATURE ON STRUCTURAL AND OPTICAL PARAMETERS OF SOL–GEL ROUTED MOLYBDENUM OXIDE THIN FILM." Surface Review and Letters 22, no. 04 (2015): 1550054. http://dx.doi.org/10.1142/s0218625x15500547.

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The influence of annealing temperature on structural and optical properties of sol–gel routed spin-coated molybdenum tri oxide ( MoO 3) thin films are studied. The higher annealing temperatures improve the crystalline nature of the film. The X-ray diffraction (XRD) study reveals the formation of α-orthorhombic phase at higher annealing temperature and amorphous nature at lower annealing temperature. The optical bandgap of molybdenum tri oxide ( MoO 3) film is found to be 3.3–3.8 eV, and the refractive index of the film is found to be 2.2–2.9. The dispersion curve of the refractive index shows

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Zhang, S. R., Z. J. Zhu, H. J. Hou, and L. H. Xie. "Structural, elastic, optical and thermodynamic properties of CdGeP2 from theoretical prediction." Journal of Ovonic Research 18, no. 6 (2022): 781–96. http://dx.doi.org/10.15251/jor.2022.186.781.

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We have studied the structural, elastic anisotropy, electronic properties and optical properties of CdGeP2 crystal by using first-principles method. The effect of pressure on the elastic constants of CdGeP2 was explored. The changes in the anisotropy of the CdGeP2 at different pressures were analyzed in detail by three-dimensional (3D) and 2D projections of bulk modulus and Young's modulus. The electronic properties, including the band structure, density of states, were investigated, and it turned out that CdGeP2 is a semiconductor. Furthermore, we analyze the dielectric function, refractive i

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Li, Lei, Shubin Yan, Yang Cui, et al. "A Nanosensor Based on Optical Principles for Temperature Detection Using a Gear Ring Model." Photonics 11, no. 4 (2024): 311. http://dx.doi.org/10.3390/photonics11040311.

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Based on the characteristics of plasmonic waveguides and resonators, we propose a refractive index (RI) sensor that couples a gear ring with a metal–insulator–metal (MIM) waveguide. Using the finite element method (FEM), we conduct extensive spectral analysis of the sensor’s properties in the near-infrared spectrum. Furthermore, we investigate the structural parameters affecting the refractive index sensing characteristics. This study reveals that the complexity of the ring cavity edge can significantly enhance the sensitivity of the nanosensor. Optimal structural performance parameters are se

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Jhakal, R. K., M. D. Sharma, and U. Paliwal. "A Theoretical Estimation of Optical, Vibrational and Structural Properties of II–VI Quaternary Alloy Zn0.5Cd0.5SySe1–y." Ukrainian Journal of Physics 68, no. 3 (2023): 184. http://dx.doi.org/10.15407/ujpe68.3.184.

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We present a theoretical estimation of optical, vibrational, and structural properties of II–VI semiconducting quaternary alloy Zn0.5Cd0.5SySe1−y for 0 < y < 1 giving total 10 compositions. The estimation of refractive index, elastic constants, bulk modulus, and vibrational frequencies are performed using the important input parameters provided by the empirical pseudopotential method. In this method, the bandgaps are computed, and the alloying effects are modeled through the modified virtual crystal approximation. We have computed the static refractive index, static and high-frequency di

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Feng, Li Ping, Zheng Tang Liu, and Qi Jun Liu. "First-Principles Calculations on Structural, Electronic, and Optical Properties of 2H-CuAlO₂." Advanced Materials Research 197-198 (February 2011): 487–90. http://dx.doi.org/10.4028/www.scientific.net/amr.197-198.487.

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Structural, electronic and optical properties of 2H-CuAlO2 were computed, using the plane-wave ultrasoft pseudopotential technique based on the first-principles density functional theory (DFT). The equilibrium lattice parameters, band structure, densities of states (DOS) and charge densities of 2H-CuAlO2 have been obtained. The equilibrium lattice parameters, band structure and DOS are found to be in good agreement with the available experimental and calculational values. The charge densities and the chemical bonding of 2H-CuAlO2 are analyzed, which show that bonding between Cu and O is mainly

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Hu, Yao, Jiahang Lv, and Qun Hao. "Refractive Index Measurement of Glass with Arbitrary Shape Based on Brewster’s Law and a Focusing Probe Beam." Sensors 21, no. 7 (2021): 2421. http://dx.doi.org/10.3390/s21072421.

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The refractive index is one of the most important parameters of optical glasses and has a significant effect on optical properties. The measurement of optical glasses, especially for optical elements such as lenses, is urgently needed. However, several presented methods require the immersion of the sample in liquid and provide indirect measurements, while others require structural parameters as priori knowledge, which is complex and time-consuming. In this study, a Brewster-Law-based direct and simple measurement method for the refractive index of glasses with arbitrary shapes is proposed, and

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Lu, Zhengxiong, Peixuan Li, Chuanwei Zhang, et al. "Terahertz Metamaterial Absorber and Equivalent Circuit Model for Refractive Index Sensing." Materials 18, no. 4 (2025): 765. https://doi.org/10.3390/ma18040765.

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As a kind of important functional device, terahertz metamaterial absorbers (TMA) have been focused on by many researchers for their capacity to absorb electromagnetic waves and wide application fields. In this work, we designed a terahertz metamaterial absorber with narrow-band absorption for refractive index sensing, which consisted of a circular metal ring resonator and a square metal ring resonator. The simulation results show that the absorptivity of the proposed TMA reached over 68.8% and 93.27% at 1.926 and 4.413 THz, respectively. Moreover, the absorption mechanism was studied through t

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Banakh, V. A., I. N. Smalikho, and I. V. Zaloznaya. "Possibility of Clear Air Turbulence Localization with Lidar." Atmospheric and Oceanic Optics 36, no. 2 (2023): 132–36. http://dx.doi.org/10.1134/s102485602303003x.

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Abstract The ranges of the parameters of wind and temperature (refractive) turbulence are estimated corresponding to the four-point scale of turbulence intensity at flight altitudes in the free atmosphere. It is shown that the estimates of both the variance of the radial velocity measured with a coherent lidar in the flight direction and of the structural constant of the refractive index from the lidar measurements of the intensity of refractive turbulence in the flight direction make it possible to judge the potential danger of bumpy flight of aircraft in clear-air turbulence zones ahead of t

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Lan, Guilian, Zhongxie Jin, Jinpeng Nong, et al. "Narrowband Perfect Absorber Based on Dielectric-Metal Metasurface for Surface-Enhanced Infrared Sensing." Applied Sciences 10, no. 7 (2020): 2295. http://dx.doi.org/10.3390/app10072295.

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We proposed a narrowband perfect absorber that was based on dielectric-metal metasurface for wide-band surface-enhanced infrared sensing. It is found that the narrowband perfect absorber can generate the hybrid guided modes with high quality-factor at infrared frequencies, which make the absorber highly sensitive to the surrounded analyte. Moreover, tuning the incident angle can actively modulate the resonant wavelength of absorber. Such an absorber with excellent features is employed to realize both refractive index sensing and infrared vibrational fingerprint sensing on a single substrate. I

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Shafi, H. Z., A. Mahmood, Z. Ali, and M. Mehmood. "Optical and Structural Analysis of GeC Thin Films Deposited by Reactive Pulsed Laser Ablation Technique." Key Engineering Materials 442 (June 2010): 178–86. http://dx.doi.org/10.4028/www.scientific.net/kem.442.178.

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GeC thin films have been prepared by reactive pulsed laser ablation technique. Methane pressure (PCH4) was varied from 0 to 75 milli torrs (mT). Optical analysis of all the samples was performed by spectroscopic ellipsometry (SE). The optical constants i.e. refractive index (n), extinction coefficient (k), absorption coefficient (α) and thickness of deposited film(s) were obtained by modeling and simulations of ellipsometric data. It was found that deposition parameter (change in pressure of methane) has a profound effect on the properties of the deposited films. To support our results of opti

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Sun, Lin, Haixin Lin, Kevin L. Kohlstedt, George C. Schatz, and Chad A. Mirkin. "Design principles for photonic crystals based on plasmonic nanoparticle superlattices." Proceedings of the National Academy of Sciences 115, no. 28 (2018): 7242–47. http://dx.doi.org/10.1073/pnas.1800106115.

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Photonic crystals have been widely studied due to their broad technological applications in lasers, sensors, optical telecommunications, and display devices. Typically, photonic crystals are periodic structures of touching dielectric materials with alternating high and low refractive indices, and to date, the variables of interest have focused primarily on crystal symmetry and the refractive indices of the constituent materials, primarily polymers and semiconductors. In contrast, finite difference time domain (FDTD) simulations suggest that plasmonic nanoparticle superlattices with spacer grou

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Wang, Xiangxian, Jian Zhang, Jiankai Zhu, Zao Yi, and Jianli Yu. "Refractive index sensing of double Fano resonance excited by nano-cube array coupled with multilayer all-dielectric film." Chinese Physics B 31, no. 2 (2021): 024210. http://dx.doi.org/10.1088/1674-1056/ac3816.

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We propose a hybrid structure of a nano-cube array coupled with multilayer full-dielectric thin films for refractive index sensing. In this structure, discrete states generated by two-dimensional grating and continuous states generated by a photonic crystal were coupled at a specific wavelength to form two Fano resonances. The transmission spectra and electric field distributions of the structure were obtained via the finite-difference time-domain method. We obtained the optimal structural parameters after optimizing the geometrical parameters. Under the optimal parameters, the figure of merit

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Li, Bo, Huarong Sun, Huinan Zhang, et al. "Refractive Index Sensor Based on the Fano Resonance in Metal–Insulator–Metal Waveguides Coupled with a Whistle-Shaped Cavity." Micromachines 13, no. 10 (2022): 1592. http://dx.doi.org/10.3390/mi13101592.

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A plasmonic refractive index sensor based on surface plasmon polaritons (SPPs) that consist of metal–insulator–metal (MIM) waveguides and a whistle-shaped cavity is proposed. The transmission properties were simulated numerically by using the finite element method. The Fano resonance phenomenon can be observed in their transmission spectra, which is due to the coupling of SPPs between the transmission along the clockwise and anticlockwise directions. The refractive index-sensing properties based on the Fano resonance were investigated by changing the refractive index of the insulator of the MI

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Zheng, Qiwen, Yamei Liu, Wenguang Lu, Xiaoyu Dai, Haishan Tian, and Leyong Jiang. "Theoretical Model for a Highly Sensitive Near Infrared Biosensor Based on Bloch Surface Wave with Dirac Semimetal." Biosensors 11, no. 10 (2021): 390. http://dx.doi.org/10.3390/bios11100390.

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In this work, we present a theoretical model of a near-infrared sensitive refractive index biosensor based on the truncate 1D photonic crystal (1D PC) structure with Dirac semimetal. This highly sensitive near-infrared biosensor originates from the sharp reflectance peak caused by the excitation of Bloch surface wave (BSW) at the interface between the Dirac semimetal and 1D PC. The sensitivity of the biosensor model is sensitive to the Fermi energy of Dirac semimetal, the thickness of the truncate layer and the refractive index of the sensing medium. By optimizing the structural parameters, th

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Alwany, Abduelwhab, Gamal Youssef, Mohammed Algradee, Moustafa Abdel-Rahim, and Alaa Abd-Elnaiem. "Effect of annealing temperature on the structural and optical properties of Ge15Se75Zn10 thin films." Processing and Application of Ceramics 15, no. 4 (2021): 385–94. http://dx.doi.org/10.2298/pac2104385a.

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Ge15Se75Zn10 thin films were deposited onto cleaned glass substrates by the vacuum thermal evaporation technique. The as-deposited and annealed thin films were characterized by scanning electron microscopy, X-ray diffraction and optical spectroscopy. The average particle sizes of the crystallized GeSe and ZnSe phases increase with increasing annealing temperature. Some optical parameters of the as-deposited and annealed Ge15Se75Zn10 thin films were studied using both transmittance T(?) and reflectance R(?) measurements. The analysis of T(?) and R(?) data revealed the existence of direct optica

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Kong, Lu, Jiangtao Lv, Qiongchan Gu, Yu Ying, Xiaoxiao Jiang, and Guangyuan Si. "Sensitivity-Enhanced SPR Sensor Based on Graphene and Subwavelength Silver Gratings." Nanomaterials 10, no. 11 (2020): 2125. http://dx.doi.org/10.3390/nano10112125.

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A novel surface plasmon resonance (SPR) sensor with graphene and subwavelength gratings is proposed to improve the sensing performance. A series of numerical analyses were performed to investigate the effect of structural parameters on the sensing performance, such as minimum reflectance at resonance (MRR), full width at half maximum (FWHM), and resonance angle. The results indicated that near-zero MRR (2.9 × 10−6) and narrow FWHM (about 3.5 deg) could be obtained by optimizing the geometrical parameters. Moreover, the influence of the number of graphene layers on sensitivity was also studied.

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Hui, Bing, Xiuhua Fu, Des Gibson, et al. "Automated Control of Plasma Ion-Assisted Electron Beam-Deposited TiO2 Optical Thin Films." Coatings 8, no. 8 (2018): 272. http://dx.doi.org/10.3390/coatings8080272.

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A hollow cathode plasma source has been operated automatically, demonstrating independent control of plasma ion energy and ion current density for plasma ion-assisted electron beam-deposited titania (TiO2). The lanthanum hexaboride hollow cathode design described in this work utilizes both the interior and exterior cathode surfaces, with the additional electrons generated removing the need for a separate neutralizing source. Automatic feedback control of plasma source cathode-to-anode accelerator voltage (AV—via argon gas flow to the anode and/or cathode plasma source areas) and accelerator cu

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Arshad Javid, M., Zafar Ullah Khan, Zahid Mehmood, et al. "Structural, electronic and optical properties of LiNbO3 using GGA-PBE and TB-mBJ functionals: A DFT study." International Journal of Modern Physics B 32, no. 14 (2018): 1850168. http://dx.doi.org/10.1142/s0217979218501680.

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In the present work, first-principles calculations were performed to obtain the structural, electronic and optical properties of lithium niobate crystal using two exchange-correlation functionals (GGA-PBE and TB-mBJ). The calculated structural parameters were very close to the experimental values. TB-mBJ functional was found to be good when compared to LDA and GGA functionals in case of bandgap energy of 3.715 eV of lithium niobate. It was observed that the upper valence and lower conduction bands consist mainly the O-2p and Nb-4[Formula: see text] states, respectively. Furthermore, calculatio

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Shaimanov, Alexey, and Alexander Baryshev. "Plasmonic magneto-optical nested 2D nanostructures: tailoring responses through effective refractive index." EPJ Web of Conferences 190 (2018): 03011. http://dx.doi.org/10.1051/epjconf/201819003011.

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Spectra of a nested square two-dimensional lattice of metal nanospheres encased in a magneto-optical host were studied. We show that the magneto-optical response of the nanostructures considerably increases due to the plasmon resonances. Moreover, the optical and magneto-optical responses can be strongly altered with a negligible change in structural parameters.

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Güneri, Emine. "The Role of Au Doping on the Structural and Optical Properties of Cu₂O Films." Journal of Nano Research 58 (June 2019): 49–67. http://dx.doi.org/10.4028/www.scientific.net/jnanor.58.49.

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The changes in structural and optical properties of the Cu2O films obtained on the glass with different concentrations of Au by the chemical bath method were studied in this work. Lattice parameter, crystal size, preferential orientation and surface tension of the films were calculated using X-ray diffraction data which showed that all of the films were in polycrystalline form. It was determined that the structural parameters of all films were changed with the doping ratio. The surface morphology of the films was imaged using a field emission scanning electron microscope. The optical propertie

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Popovych, M. V. "CHALCOGENIDE GLASSES: STRUCTURAL AND OPTICAL PROPERTIES." Optoelektronìka ta napìvprovìdnikova tehnìka 58 (December 21, 2023): 63–91. http://dx.doi.org/10.15407/iopt.2023.58.063.

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Structural properties of chalcogenide glasses mainly on the example of binary As-S(Se) and Ge-S(Se) systems and ternary Ge-As-S(Se) systems, structural models, parameters of short range order of glasses obtained using diffraction methods, EXAFS and Raman spectroscopy are considered. Raman spectra of binary As-S(Se) and Ge-S(Se) systems and ternary Ge-As-S(Se) systems, structural models that are used for interpretation of Raman spectroscopy results are considered. Optical properties of chalcogenide glasses and optical absorption edge in binary and multicomponent systems are discussed. The refra

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Pathak, Rahman, Singh, and Kumari. "Sensitivity Enhancement of a Concave Shaped Optical Fiber Refractive Index Sensor Covered with Multiple Au Nanowires." Sensors 19, no. 19 (2019): 4210. http://dx.doi.org/10.3390/s19194210.

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In the present paper, a new kind of concave shaped refractive index sensor (CSRIS) exploiting localized surface plasmon resonance (LSPR) is proposed and numerically optimized. The LSPR effect between polaritons and the core guided mode of designed CSRIS is used to enhance the sensing performance. The sensor is characterized for two types of sensing structures coated with gold (Au) film and Au nanowires (AuNWs), respectively. The influence of structural parameters such as the distance (D) of the concave shaped channel (CSC) from the core, the diameter of the nanowire (dn) and the size (s) of th

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Heiba, Zein K., Mohamed Bakr Mohamed, and Ali Badawi. "Effect of vanadium doping on the structural and optical characteristics of nano ZnCdS." Physica Scripta 97, no. 5 (2022): 055802. http://dx.doi.org/10.1088/1402-4896/ac5e58.

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Abstract Nano Zn0.75-xCd0.25VxS (0 ≤ x ≤ 0.2, step 0.05) samples were formed by the molten salt solid state reaction method at low temperature. Synchrotron x-ray diffraction phase identification revealed biphasic ZnS structure for all samples, cubic zinc blende and hexagonal wurtzite. Rietveld analysis was applied to determine the effect of V-doping on the percentage of each phase and their structural and microstructural parameters. The existence of V ions in the Zn0.75Cd0.25S (ZnCdS) lattice is confirmed by Fourier-transform infrared spectroscopy (FTIR) technique. Utilizing the UV–vis diffuse

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Ghanipour, Mahshad, and Davoud Dorranian. "Effect of Ag-Nanoparticles Doped in Polyvinyl Alcohol on the Structural and Optical Properties of PVA Films." Journal of Nanomaterials 2013 (2013): 1–10. http://dx.doi.org/10.1155/2013/897043.

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The effect of silver nanoparticles doped in PVA on the structural and optical properties of composite films is studied experimentally. Samples are PVA films of 0.14 mm thickness doped with different sizes and concentrations of silver nanoparticles. Structural properties are studied using X-ray diffraction and FTIR spectrum. Using the reflectance and transmittance of samples, the effect of doped nanoparticles and their concentration on optical parameters of PVA films include absorption coefficient, optical bandgap energy, complex refractive index, complex dielectric function, complex optical co

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Liang, Kai, and Hui Zhao. "First-principles study of electronic and optical properties of Sr2ZnN2 under pressure." Modern Physics Letters B 30, no. 10 (2016): 1650139. http://dx.doi.org/10.1142/s0217984916501396.

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First-principles calculations of ternary Sr2ZnN2 compound using density-functional theory (DFT) method within the generalized gradient approximation (GGA) has been performed. Based on the optimized structural parameter, the electronic properties and optical properties have been researched. The calculated lattice constants are in agreement with the experimental and theoretical results. The electronic structure have been investigated throughout the calculated band structure and density of states (DOS). It shows that this compound belongs to the semiconductors with a band gap of about 0.775[Formu

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Mohd Fudzi, Faznny, Halimah Mohamed Kamari, Amirah Abd Latif, and Azlan Muhammad Noorazlan. "Linear Optical Properties of Zinc Borotellurite Glass Doped with Lanthanum Oxide Nanoparticles for Optoelectronic and Photonic Application." Journal of Nanomaterials 2017 (2017): 1–8. http://dx.doi.org/10.1155/2017/4150802.

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Enhancing the optical properties of glasses for the sake of optical application in various fields is an ongoing challenge in materials science and technology. Thus, the optical properties of zinc borotellurite glass doped with lanthanum oxide nanoparticles (La2O3 NPs) with the chemical composition of {[(TeO2)0.7(B2O3)0.3]0.7(ZnO)0.3}1−x (La2O3 NPs)x, where x = 0.01, 0.02, 0.03, 0.04, and 0.05 molar fraction, have been investigated. Characterization techniques such as x-ray diffraction, Fourier Transform Infrared Spectroscopy, and Ultraviolet-Visible Spectroscopy are employed to yield the struc

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