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Frontiers in Optics + Laser Science 2023, FiO, LS 203: Part of Frontiers in Optics + Laser Science 2023

作者： Nazari, Masoumeh Banad, Yaser Mike Sharif, Sarah Safura School of Electrical and Computer Engineering University of Oklahoma NormanOK United States University of Oklahoma NormanOK United States

ISBN: (纸本)9781957171296

We introduce a pioneering approach to design Focal Plane Array (FPA)-based spectrometers featuring several perfect nano-size absorbers to accurately determine the wavelength of incident light, eliminating the need for conventional bulky spectrometers and enhancing portability and efficiency for various applications. © Optica Publishing Group 2023, © 2023 The Author(s)

关键词： Absorbers Absorption spectroscopy finite-difference time-domain method Laser systems Machine learning Spectrometers

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Design and Fabrication of Millimeter-Scale Au Metamaterials with Infrared Radiation Suppression

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ACTA OPTICA SINICA 2024年第4期44卷

作者： Li Chenxi Li Xiangcheng Chen Ping'an Zhu Yingli Zhu Boquan Wuhan Univ Sci & Technol State Key Lab Refractories & Met Wuhan 430081 Hubei Peoples R China

Objective Using infrared radiation suppression materials is regarded as an effective method to address the worsening thermal pollution owing to their favorable low-emission and radiation-cooling properties. According to the Stefan-Boltzmann law, the reduction of the thermal surface emissivity of a material can effectively suppress the infrared radiant energy. Metamaterial (MM) is an emerging branch of infrared radiation suppression materials with highly flexible spectral modulation capability and spectral designability. The infrared emission bandwidth and position will be precisely regulated by adjusting their pattern shapes and structure parameters, and thus the selective modulation of the infrared emission spectrum can be realized. However, due to the limitation of computer resources and computation power, it has always been challenging to directly obtain the infrared spectral response of millimeter-scale metamaterials through simulation software. Therefore, we hope to establish a computational model of the infrared spectral response of millimeter- scale metamaterials, which provides a novel approach for the design of broadband infrared radiation suppression functional devices. methods In this paper, the mid-and far-infrared spectral response of millimeter-square metamaterials is simulated based on the time-domain finite-difference method. Combined with the electric field scattering effect, the impact of the marginal electric field strength distribution of the millimeter square pattern on the infrared reflectivity is analyzed. According to the traditional empirical formula, the computational model of the infrared spectral response of millimeter-square metamaterials is proposed. Using the full-wave electromagnetic simulation software FDTD and the parameter scanning method, the effects of the thicknesses of Au and SiO2 on the infrared spectral response are investigated, and the optimal thicknesses of the reflector layer and the substrate layer are identified. Herein

关键词： optical design millimeter-scale metamaterials electric field scattering effect finite-difference time-domain method mid-and far-infrared high reflection

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Hardware-accelerated Full-wave Simulation of 3D Large Area Metalenses

Hardware-accelerated Full-wave Simulation of 3D Large Area M...

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2023 Flat Optics: Components to Systems, FLatOptics 2023 in Optica Imaging Congress - Part of Imaging and Applied Optics Congress 2023

作者： Chen, Xinzhong Hughes, Tyler W. Minkov, Momchil Liu, Victor Yu, Zongfu Fan, Shanhui Flexcompute Inc. 130 Trapelo Rd. BelmontMA02478 United States Department of Electrical and Computer Engineering University of Wisconsin-Madison 1415 Engineering Dr. MadisonWI53706 United States Department of Electrical Engineering Stanford University 350 Jane Stanford Way StanfordCA94305 United States

Advances in computing hardware have now created opportunities for full-wave simulation of large metalenses. We demonstrate that a hardware-accelerated FDTD solver is capable of simulating metalenses of diameter over ... 详细信息

ISBN: (纸本)9781957171289

关键词： Apertures Display technology finite-difference time-domain method Lenses Resolution

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Fundamental design framework of hybrid refractive-metalens system for axial aberrations correction and its validation in LWIR band

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Optics Express 2025年第13期33卷 27535-27547页

作者： Aoling Li Jinyang Chen Man Liu Wenzhi Wei Huigao Duan Honghui Jia Yueqiang Hu National Research Center for High-Efficiency Grinding College of Mechanical and Vehicle Engineering Hunan University Changsha 410082 China Greater Bay Area Institute for Innovation Hunan University Guangzhou 511300 Guangdong China Advanced Manufacturing Laboratory of Micro-Nano Optical Devices Shenzhen Research Institute Hunan University Shenzhen 518000 China

Due to the limited phase coverage and dispersion range that meta-atoms can provide, the aperture of a single achromatic metalens typically remains below the centimeter threshold. This limitation has spurred the development of a hybrid refractive-metalens system (HRMS), which can offer the potential to overcome the performance limitations of single metalens while maintaining a more compact form factor compared to conventional refractive lenses, thereby presenting significant application prospects. However, previous studies have predominantly regarded the metalens as a corrector for refractive optics, with limited exploration into the specific role it plays within the HRMS and how the degrees of freedom inherent to metalenses can be effectively leveraged. Here, A ray tracing-based methodology that places emphasis on incorporating the dispersion characteristics of meta-atoms is introduced, and specifically, three types of phase formulas offering progressively greater freedom degrees of the dispersion modulation for metalenses are examined. We have presented two hybrid refractive-metalens axial aberrations correction systems, each utilizing distinct phase formulas, which share the same system parameters: an entrance pupil diameter of 25.4 mm, an effective focal length of 45 mm, within the 9.2-11.8 μm long-wave infrared band. Simulation results indicate that the superior HRMS system exhibits an average efficiency exceeding 85% across the designed wavelength range. Additionally, experimental results confirmed that the imaging performance of both HRMS configurations surpasses that of a single metalens, validating the effectiveness of the HRMS concept. Moreover, we explore the application scope of our method and clarify that the metalens in HRMS should undertake negative dispersion and positive optical power, striking a balance between dispersion modulation freedom and optical power. The framework is expected to find significant applications in compact and lightweight optic

关键词： Chromatic aberration Diffractive optical elements finite-difference time-domain method Imaging systems Optical systems Phase matching

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Effect of junction critical current disorder in superconducting quantum interference filter arrays

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Physical Review B 2024年第5期109卷 054507-054507页

作者： K.-H. Müller E. E. Mitchell CSIRO Manufacturing PO Box 218 Lindfield New South Wales 2070 Australia

In this study, we investigated the performance of two 2D superconducting quantum interference filter (SQIF) arrays fabricated from YBCO thin films at a temperature of 77 K. Each array consisted of 6 Josephson junctions (JJs) in parallel and 167 in series. We conducted both experimental and theoretical analyses, measuring the arrays' voltage responses to an applied magnetic field and their voltage versus bias-current characteristics. To properly model the planar array layouts, our theoretical model used the stream function approach and also included the Johnson noise in the JJs. The model further divides the superconducting current density of the arrays into its Meissner current, circulating current, and bias current parts for practicality. Since the fabrication process of YBCO thin films cannot produce identical JJ critical currents, we assumed a log-normal distribution to model the JJ critical current disorder. Our model predictions, with a JJ critical current spread of 50%, agreed well with our experimental data. Using our model, we were able to study the dependence of the voltage modulation depth on critical current disorder and London penetration depth. We also analyzed the observed reflection asymmetries of the voltage versus magnetic field characteristics, which might provide insight into the degree of critical current disorder. Overall, our findings suggest that the use of YBCO thin films in SQIF arrays is promising, despite the critical current disorder inherent in their fabrication process. Our study highlights the importance of theoretical modeling in understanding the performance of superconducting devices and provides insights that could inform the design of future SQIF arrays.

关键词： Electrical properties Devices High-temperature superconductors Josephson junctions Superconducting devices Superconductors Thin films Film deposition finite-difference time-domain method finite-element method Lithography London theory methods in superconductivity Monte Carlo methods Resistivity measurements Superconductivity

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Analytical model and dynamical phase-field simulation of terahertz transmission across ferroelectrics

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Physical Review B 2024年第9期109卷 094305-094305页

作者： Taorui Chen Bo Wang Yujie Zhu Shihao Zhuang Long-Qing Chen Jia-Mian Hu Department of Materials Science and Engineering University of Wisconsin-Madison Madison Wisconsin 53706 USA Materials Science Division Lawrence Livermore National Laboratory Livermore California 94550 USA Department of Materials Science and Engineering The Pennsylvania State University University Park Pennsylvania 16802 USA

We theoretically investigate the steady-state transmission of continuous terahertz (THz) wave across a freestanding ferroelectric slab. Based on the Landau-Ginzburg-Devonshire theory of ferroelectrics and the coupled equations of motion for polarization and electromagnetic (EM) waves, we derive the analytical expressions of the frequency- and thickness-dependent dielectric susceptibility and transmission coefficient at the thin slab limit in the harmonic excitation regime. When the slab thickness is much smaller than the THz wavelength in the ferroelectric, the analytical predictions agree well with the numerical simulations from a dynamical phase-field model that incorporates the coupled dynamics of strain, polarization, and EM wave in multiphase systems. At larger thicknesses, the transmission is mainly determined by the frequency-dependent attenuation of THz waves in the ferroelectric and the formation of a standing polarization/THz wave. Our results advance the understanding of the interaction between THz wave and ferroelectrics and suggest the potential of exploiting ferroelectrics to achieve low-heat-dissipation, nonvolatile voltage modulation of THz transmission for high-data-rate wireless communication.

关键词： Ferroelectricity Ferroelectrics Classical electromagnetism finite-difference time-domain method Landau-Ginzburg-Devonshire theory Phase-field modeling

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Ferromagnetic resonance in three-dimensional tilted-square artificial spin ices

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Physical Review B 2024年第14期110卷 144406页

作者： Ghanem Alatteili Alison Roxburgh Ezio Iacocca Center for Magnetism and Magnetic Nanostructures

Artificial spin ices (ASIs) arranged in square formations have been explored from the perspective of reconfigurable magnonics. A new frontier in ASIs is their three-dimensional (3D) extension. The analytical and numerical study of such geometries is difficult due to the additional degrees of freedom. Here, we numerically explore the ferromagnetic resonance of the simplest 3D modification of a square ASI: an out-of-plane rotation of the nanomagnets. We consider cases in which the vertex gap can be either kept constant or varying with the tilt angle. We study both remanent and vortex configurations using a semianalytical dynamic approach and micromagnetic simulations. We find that both methods capture the expected qualitative frequency dependence on tilt angle based on the static stray field coupling. However, we also find important limitations for both approaches that depend on the particularities of the shape-dependent demagnetization field. These results showcase advantages and limitations of both methods in their use of predicting and understanding the resonant magnetization dynamics of 3D ASI.

关键词： Magnetism Artificial spin ice Magnonic crystals finite-difference time-domain method Tight-binding model

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Tunable focus and multiple plasmonic bottles from the superposition of half Pearcey plasmons

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Physical Review A 2024年第6期109卷 063501-063501页

作者： JunXi Zhang YanRu Chen Zhang Ruan ZiEn Feng ZeHong Liang HeChong Chen GuangHui Wang DongMei Deng School of Information and Optoelectronic Science and Engineering South China Normal University Guangzhou 510006 China Provincial Key Laboratory of Nanophotonic Functional Materials and Devices South China Normal University Guangzhou 510631 China

In this paper we utilize the half Pearcey function as a means to describe a surface plasmon, the half Pearcey plasmon. The abrupt autofocusing and self-healing properties from the superposition of the half Pearcey plasmon are observed and discussed. The tunable focal intensity covers three orders of magnitude and the autofocusing property can be maintained with the potential well. Additionally, with the π phase offset, we construct multiple plasmonic bottles with the chirp factor; both the bottle structure and propagating direction are adjustable. The focusing properties of the plasmon under the chirp depend on the spatial spectrum separation, resulting in the construction of plasmonic bottles with different positions and sizes. The validity of our results is confirmed by finite-difference time-domain numerical simulations. Our findings may provide potential for spectral enhancement, nanoscale plasmonic devices, and plasmonic trapping.

关键词： Schroedinger equation Self-focusing Surface plasmon polariton Drude model finite-difference time-domain method

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Influence of Grounding Wires on Measured Frequency-Dependent Soil Properties 36

Influence of Grounding Wires on Measured Frequency-Dependent...

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36th International Conference on Lightning Protection (ICLP)

作者： Borozdina, Evgeniya Kuklin, Dmitry Russian Acad Sci Kola Sci Ctr Northern Energet Res Ctr Branch Fed Res Ctr Apatity Russia

ISBN: (数字)9781665490245

ISBN: (纸本)9781665490245

Calculations and measurements show that the grounding wires can significantly influence measured frequency-dependent soil properties (resistivity and permittivity). The smaller the distance between the grounding wire and the measurement setup, the larger the measurement error. In order to improve measurement accuracy, one should determine the minimum distance for which the measurement error can be neglected. The work proposes and experimentally validates the simulation model based on the finite-difference time-domain method. The model allows changing the grounding wire position relative to the measurement setup and estimating the measurement error. It has been demonstrated that a distance of about 1.5 m between the wire and the array is sufficient to neglect the measurement error.

关键词： grounding wire simulation finite-difference time-domain method frequency-dependent soil properties soil resistivity complex permittivity

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Calculation of charge-transfer plasmonic properties in one- and two-dimensional periodic systems

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Journal of Optical Technology 2025年第11期91卷 711-716页

作者： Alexer S. Fedorov Egor V. Eremkin Valery S. Gerasimov L. V. Kirensky Institute of Physics Siberian Branch of the Russian Academy of Sciences Krasnoyarsk Russia Siberian Federal University Krasnoyarsk Russia qchem99@yandex.ru (qchem99@yandex.ru) Institute of Computational Modeling Siberian Branch of the Russian Academy of Sciences Krasnoyarsk Russia gerasimov@icm.krasn.ru (gerasimov@icm.krasn.ru)

Subject of study. One- and two-dimensional periodic structures of nanoparticles connected by conducting linkers (bridges) were investigated. Aim of study. The aim was to develop a model for determining the properties of charge-transfer plasmons in one- and two-dimensional periodic systems of metal nanoparticles. method. A hybrid quantum–classical approach, which was modified for periodic systems, was employed. Main results. The modified model was applied to two systems of periodic metal nanoparticles connected by conducting linkers. The corresponding results demonstrated that the plasmon frequencies were within the infrared range. Practical significance. The proposed hybrid model enables the calculation of the plasmon properties of complex periodic systems composed of connected metal nanoparticles, facilitating their application in various detectors.

关键词： finite-difference time-domain method Metal nanoparticles Nanoparticles Polymers Raman scattering Surface plasmons

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