Article
Optics
Nikolaos Stefanou, Ioannis Stefanou, Evangelos Almpanis, Nikolaos Papanikolaou, Puneet Garg, Carsten Rockstuhl
Summary: This paper presents a proper generalization of the extended boundary condition method to calculate the transition matrix, T, for electromagnetic scattering from a homogeneous and isotropic body of arbitrary shape, which is characterized by a periodically time-varying electric permittivity. The application of the method on a specific example of a spheroidal dielectric particle confirms that time modulation induces strong inelastic scattering and energy transfer between the scatterer and the light field. Moreover, the effects can be selectively tuned for nonspherical scatterers using external means such as the polarization and propagation direction of the incident light beam.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2023)
Article
Engineering, Electrical & Electronic
Beibei Kong, Pasi Yla-Oijala, Ari Sihvola
Summary: A surface integral equation (SIE) method has been developed for analyzing electromagnetic scattering by 3-D objects with soft-and-hard/DB (SHDB) boundary conditions. By expressing the SHDB boundary condition in vector form and combining it with tangential field integral equations, a more stable system is obtained for numerical simulations and comparisons. The proposed nonsquare integral equation solutions have been verified using physical optics approximations.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Optics
Alexander Berk
Summary: This paper reformulates the equations used to compute Stokes phase matrices for macroscopically isotropic mirror symmetric scattering medium in order to eliminate numerical instability issues and the need to treat positive and negative relative azimuth angles as separate cases.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2022)
Article
Astronomy & Astrophysics
Yong-Hui Lin, Hans-Werner Hammer, Ulf-G Meissner
Summary: We predict the differential cross sections for e(-)p and e(+)p elastic scattering in the PRad-II energy region. The sensitivity of the cross sections to two-photon exchange effects is investigated, and it is found that the differences between model calculations and phenomenological extractions of two-photon corrections cannot be resolved if the uncertainty in the form factors is taken into account.
Article
Chemistry, Physical
Matt R. A. Majic, Baptiste Auguie, Eric C. Le Ru
Summary: This study compares different approximation methods to predict the spectra of metallic spheroidal nanoparticles. The results show that the Taylor expansion provides more accurate predictions and is applicable to a wider range of parameters.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Optics
Bingqiang Sun, Chenxu Gao, Lei Bi, Robert Spurr
Summary: In this study, the integrated and differential optical properties of single particles were derived from electromagnetic scattering theory, and Jacobians of these properties with respect to input parameters were obtained using the IITM method. The validity of these Jacobians for different particle shapes was confirmed through comparisons with results calculated by the EBCM method and finite-difference estimates. The dependencies of these Jacobians on input microphysical parameters were analyzed for spheroids, cylinders, and hexagonal prisms.
Article
Thermodynamics
Liliane Basso Barichello, Karine Rui, Rudnei Dias da Cunha
Summary: In this work, the Analytical Discrete Ordinates (ADO) method is applied to solve the discrete ordinates approximation of the two-dimensional radiative transfer equation. By using the nodal technique and the ADO method, this approach can obtain accurate solutions with more refined domain partitions, and comparisons and analysis in the literature reinforce the good performance of this method.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Engineering, Electrical & Electronic
Minas Kouroublakis, Nikolaos L. Tsitsas, George Fikioris
Summary: Extensive experimental data and numerical simulations have demonstrated that graphene is an excellent choice for shielding in the RF/microwave region. However, it exhibits anisotropy under electrostatic and magnetostatic bias, which is described by a surface conductivity tensor. The objective of this study is to evaluate the shielding effectiveness of anisotropic graphene in the RF/microwave region.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Optics
Shuai Hu, Lei Liu, Qingwei Zeng, Taichang Gao, Feng Zhang
Summary: By systematically investigating the symmetrical properties of nonspherical particles with symmetrical geometries, this study proposes a method to simplify the T-matrix iteration. It rearranges the U-matrix and T-matrix into block diagonal form to reduce computational amount and memory consumption significantly. The derivation process also provides another perspective to understand the symmetry of T-matrix for particles with N-folds symmetrical geometry.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2021)
Article
Computer Science, Software Engineering
Yu Guo, Adrian Jarabo, Shuang Zhao
Summary: This paper presents a generalized framework for computing bulk scattering parameters beyond the far-field assumption of Lorenz-Mie theory, taking into account microscale wave-optics effects and interactions between nearby particles. The framework is versatile, compatible with any renderer supporting Lorenz-Mie scattering, and capable of handling various materials, including anisotropic and correlated media.
ACM TRANSACTIONS ON GRAPHICS
(2021)
Article
Optics
Chenxu Gao, Bingqiang Sun
Summary: The Jacobians of particle scattering properties with respect to aspect ratio and effective radius are significantly improved using the improved invariant imbedding T-matrix method, and the discrepancies between different definitions of effective radius are discussed.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2022)
Article
Environmental Sciences
Ming Li, Husi Letu, Yiran Peng, Hiroshi Ishimoto, Yanluan Lin, Takashi Y. Nakajima, Anthony J. Baran, Zengyuan Guo, Yonghui Lei, Jiancheng Shi
Summary: This study simulated the optical and radiative properties of ice clouds using a parameterization scheme of the Voronoi ICS model in a climate model. The results showed that the Voronoi scheme had smaller differences in global average cloud radiative forcing compared to other existing schemes, and it provided the closest match with EBAF products in regions where ice clouds occur frequently.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2022)
Article
Engineering, Electrical & Electronic
Hui Zhou, Xiao-Hua Wang, Li Xiao, Bing-Zhong Wang
Summary: This work proposes an efficient hybrid method that combines the efficient iterative method of moments-physical optics and the equivalent dipole moment with the high-order impedance boundary condition for the study of electromagnetic scattering from objects with isotropic or anisotropic surface coatings. Numerical results demonstrate that this hybrid method significantly reduces computation time and agrees well with traditional methods.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Optics
Misael Natanael, Alexander A. Iskandar, Radius N. S. Suryadharma
Summary: This paper discusses the Fano response of a hybrid trimer composed of gold and silicon nanospheres, analyzing its plasmonic properties and spectral tuning. The Fano response is analyzed from the point of view of individual subsystems and the coupling of supermodes of the structure. Insight is provided into designing a hybrid structure with tunable Fano properties by tracing the coupling between sustained non-orthogonal eigenmodes due to sharing the same multipolar moments.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2021)
Article
Environmental Sciences
Guangbin Guo, Lixin Guo, Rui Wang, Wei Liu, Long Li
Summary: In this study, an inverse synthetic aperture radar (ISAR) imaging algorithm is proposed for a composite target-ocean scene using the time-domain shooting and bouncing rays (TDSBR) method. The electromagnetic scattering echoes are simulated using the TDSBR method, and ISAR imaging formulas are derived based on the electromagnetic scattering field expressions. Furthermore, the proposed method replaces linear frequency modulation (LFM) pulses with modulating Gaussian pulses to improve efficiency.
Article
Optics
Michael I. Mishchenko, Nadezhda T. Zakharova, Nikolai G. Khlebtsov, Gorden Videen, Thomas Wriedt
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2017)
Article
Optics
Mikhail D. Alexandrov, Michael I. Mishchenko
Article
Optics
Michael I. Mishchenko, Maxim A. Yurkin
Article
Astronomy & Astrophysics
Estelle Deau, Luke Dones, Michael I. Mishchenko, Robert A. West, Paul Helfenstein, Matt M. Hedman, Carolyn C. Porco
Article
Optics
Janna M. Dlugach, Oleksandra V. Ivanova, Michael I. Mishchenko, Viktor L. Afanasiev
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2018)
Article
Optics
Michael I. Mishchenko, Ping Yang
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2018)
Article
Optics
Maxim A. Yurkin, Michael I. Mishchenko
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2018)
Article
Optics
Michael Mishchenko, Maxim A. Yurkin
Article
Environmental Sciences
Li Liu, Michael I. Mishchenko
Article
Optics
Michael I. Mishchenko, Janna M. Dlugach, Andrew A. Lacis, Larry D. Travis, Brian Cairns
Article
Optics
Michael Mishchenko, Janna M. Dlugach
Article
Optics
Li Liu, Michael Mishchenko
Article
Optics
Jiachen Ding, Ping Yang, Michael Mishchenko, Robert D. Nevels
Article
Optics
Michael Mishchenko, Janna M. Dlugach
Article
Optics
Michael Mishchenko, Maxim A. Yurkin, Brian Cairns
Article
Optics
Jianbao Zhao, Brant E. Billinghurst, Paul L. Raston
Summary: The far-infrared spectrum of room temperature formic acid labeled with 13C has been recorded and analyzed, leading to the determination of accurate line positions and predictions relevant to Earth's atmosphere and interstellar sources.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2024)
Article
Optics
Semen Vasilchenko, Alexander Solodov, Oleg Egorov, Vladimir Tyuterev
Summary: Ozone plays a crucial role in atmospheric chemistry and radiative processes, and it may serve as a potential biosignature species in exoplanetary observations. This study utilized a continuous-wave cavity-ring-down spectrometer to accurately measure the absorption cross-sections of ozone in the near-infrared range. The results provide more precise data and have potential applications in atmospheric research.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2024)
Article
Optics
Baorui Huang, Bo Peng, Qifeng Ren, Sheng Liao
Summary: This study utilizes the polarization bidirectional reflectance distribution function (p-BRDF) model derived from the microfacet theory to analyze the spectral p-BRDF of a brass surface. The results show that factors such as polarization state, wavelength, surface roughness, and permittivity have a significant impact on the distribution of BRDF on the object surface.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2024)
Article
Optics
Qingwei Duan, Jiajie Wang, Qiwei Li, Xiang'e Han, Kuan Fang Ren
Summary: This paper introduces the applications of the generalized Lorenz-Mie theory (GLMT) and the vectorial complex ray model (VCRM) in the interaction between beams and particles. By comparing the experimental results, it is found that VCRM performs well in Gaussian beam scattering problems, providing a new method for studying the scattering of shaped beams by large particles/objects of any shape.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2024)
Article
Optics
Yuefan Du, Xiaoping Li, Lei Shi, Fangyan Li, Shurong Yuan
Summary: This study proposes a physics-constrained model that utilizes the distribution characteristics of gas spectral parameters to predict spectral parameters for unknown wavelengths. Experimental results show that the model improves prediction accuracy and increases the data volume of gas spectral parameters by 4-5 times.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2024)
Article
Optics
Laurentius Windholz, Imran Siddiqui, Shamim Khan, Syed Tanweer Iqbal
Summary: In this study, we report the discovery of two energy levels of the Pr atom that exhibit strong J-mixing, as well as the observed hyperfine structure patterns. The composition of wave functions, in addition to J-values, plays a crucial role in determining the appearance of these patterns.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2024)
Article
Optics
Matthias Germann, Adrian Hjalten, Jonathan Tennyson, Sergei N. Yurchenko, Iouli E. Gordon, Christian Pett, Isak Silander, Karol Krzempek, Arkadiusz Hudzikowski, Aleksander Gluszek, Grzegorz Sobon, Aleksandra Foltynowicz
Summary: In this study, optical frequency comb Fourier transform spectroscopy was used to record the spectroscopic data of formaldehyde in a specific frequency range. The line positions and intensities of rovibrational transitions were obtained through line-by-line fitting. By incorporating these accurate line positions into the analysis, more energy levels and rovibrational transitions were predicted with reduced uncertainties in the H2CO spectrum.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2024)
Article
Optics
Leonardo A. Ambrosio, Jhonas O. de Sarro, Gerard Gouesbet
Summary: This study derives a polychromatic version of the generalized Lorenz-Mie theory stricto sensu (GLMT) by expanding arbitrary time-dependent fields into partial waves using Bromwich scalar potentials. The new formalism introduces field shape spectra (FSSs) which are intrinsically frequency-dependent, modifying and redefining the physical quantities expressed in the monochromatic GLMT.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2024)
Article
Optics
Patrick C. Chaumet
Summary: The paper proposes two new methods (IDR(s) and GPBiCGstab(L)) for computing the electromagnetic diffraction of objects larger than the wavelength. It is found that IDR(s) can reduce computation time but may not converge in some cases, while GPBiCGstab(L) always converges and also reduces computation time compared to QMR, GPBiCG, and BiCGstab.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2024)
Article
Optics
Antigoni Kleanthous, Anthony J. Baran, Timo Betcke, David P. Hewett, Christopher D. Westbrook
Summary: To improve weather and climate models, it is important to accurately calculate the single-scattering properties of randomly oriented complex atmospheric ice crystals. This study applies Boundary Element Method (BEM) to calculate these properties in the microwave and sub-millimeter region of the electromagnetic spectrum for all-sky data assimilation. The results show that BEM can accurately compute the scattering properties of complex ice aggregates, which is crucial for weather and climate models.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2024)
Article
Optics
Ben Niu, Yanting Li, Gang Xiong, Jihui Chen, Zhimin Hu, Yunqing Fu, Yaming Zou, Chongyang Chen, Ke Yao
Summary: This study presents both experimental and theoretical analysis of the 4d 2D5/2 -> 2D3/2 magnetic dipole transition in Rb-like ions. The correlation between the theoretical and experimental findings is observed, and it is illustrated that the contribution of the core-valence correlation is pivotal for the fine structure splittings.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2024)
Article
Optics
James A. Lock, Gunther P. Konnen, Philip Laven
Summary: Researchers have derived an analytical generalization of Airy theory that provides a more accurate approximation for the primary rainbow, but still has limitations for the second-order rainbow and beyond.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2024)
Article
Optics
Shixiong Wu, Xuebang Gao, Xuqiang Dou, Li Xie
Summary: In this paper, an indoor experimental study was conducted to investigate the optical attenuation caused by sand/dust storms at different relative humidity levels. It was found that the hygroscopic growth of sand/dust particles has a significant effect on optical attenuation when the relative humidity is above 60%. Based on the double-parameter Kasten model, a proposed optical attenuation model takes into account visibility, particle size, relative humidity, and optical wavelength. Numerical calculations considering the hygroscopicity effect were also performed, and the results were in agreement with the experimental data.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2024)
Article
Optics
Zhimin Yang, Jaeman Song, Bong Jae Lee
Summary: In this study, we analyze TPX cells operating in the self-sustaining circuit and examine the effects of different bandgaps on their performance. The results show that the bandgap energy of the LED must exceed that of the PV cell for the TPX cell to function in a self-sustaining parallel circuit. Additionally, a narrower bandgap energy for the PV cell and a wider bandgap energy for the LED can improve the performance of the TPX cell in the self-sustaining circuit.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2024)
