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Conference on Silicon Photonics XIX

作者： Sayed, Mostafa Maher, Abdullah Ghanim, AbdelRahman M. Yahia, Ashraf Swillam, Mohamed. A. Amer Univ Cairo Branch Dept Phys New Cairo Egypt Ain Shams Univ Fac Sci Dept Phys Cairo 11566 Egypt

ISBN: (纸本)9781510670433;9781510670426

Surface Plasmon Polariton resonant sensors (SPPs) have found wide-ranging applications, particularly for nanoscale sensing. The SPP dispersion is determined by the properties of a limited number of suitable metals and cannot be arbitrarily tuned. The proposed gas sensor is based on surface plasmon polariton manipulated in the metamaterial surface. The plasmonic sensor utilizes a metal-air interface to detect and analyze various substances and phenomena in the mid-infrared range. The utilization of the Mid-infrared (MIR) wavelength range offers numerous benefits across a wide range of applications, including chemical and biological detection. This paper introduces a metasurface composed of highly doped silicon that demonstrates a plasmonic effect in the mid-infrared wavelength range. Silicon has several benefits, including compatibility with CMOS technology and easy manufacturing utilizing traditional silicon fabrication techniques. In addition, operating in the mid-infrared (mid-IR) range and using doped silicon material enables the development of integrated plasmonic devices at the microscale. In this paper, a meta surface plasmonic grating is proposed for sensing and detecting the refractive index changes. In order to test the performance of the plasmonic sensor, a commercial Lumerical software based on finite difference time domain (FDTD) has been used. The suggested design shows high sensitivity at lambda = 13.9807 mu m and it can be used for gas sensing applications.

关键词： Plasmonic sensors Refractive index Silicon Reflection Sensors Mid infrared Metals Design finite-difference time-domain method Physics

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Ultra-fast tunable optoelectronic 2-to-4 binary decoder using graphene-coated silica rods in photonic crystal ring resonators

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OPTICAL AND QUANTUM ELECTRONICS 2022年第11期54卷 1-16页

作者： Naghizade, Saleh Didari-Bader, Azadeh Saghaei, Hamed Islamic Azad Univ Tabriz Branch Young Researchers & Elite Club Tabriz Iran Chapman Univ Dale E & Sarah Ann Fowler Sch Engn Orange CA USA Islamic Azad Univ Dept Elect Engn Shahrekord Branch Shahrekord Iran Islamic Azad Univ Energy Res Ctr Shahrekord Branch Shahrekord Iran

Fast and compact optoelectronic devices are highly sought after for applications in high-speed signal processing in optical communication networks. One approach to realizing such devices is through all-optical digital logic circuits. One of the main building blocks of such circuits is a decoder. In this work, we present a novel design for a tunable optoelectronic 2-to-4 binary decoder. The presented structure is realized by utilizing three photonic crystal (PhC) ring resonators. Each PhC ring resonator is formed by silicon rods encircled by silica (SiO2) rods coated with graphene nanoshells (GNSs). By adjusting the chemical potential of GNS with a proper gate voltage, we can tune the desired PhC resonant mode. The fundamental PhC microstructure's photonic band structure is analyzed by using the plane wave expansion method. Furthermore, the finite-difference time-domain technique is used to solve Maxwell's equations and analyze the light propagation within the structure. Our numerical results reveal that 0.8 ps and 0.3 ps are the maximum rise and fall times for the final structure, respectively and the total size of this device is 850 mu m(2). Due to the short rise and fall times and its size which are among very important features in high-speed systems, the proposed design could be utilized for high-speed signal processing systems in miniaturized optical communication network devices.

关键词： Photonic crystal Optoelectronic decoder Graphene-coated silica rods Chemical potential Light propagation finite-difference time-domain method

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Recent techniques on sound field simulation

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JAPANESE JOURNAL OF APPLIED PHYSICS 2022年第SG期61卷 SG0801-SG0801页

作者： Tsuchiya, Takao Doshisha Univ Dept Informat Syst Design Kyoto 6100321 Japan

This is a tutorial paper on the basics and applications of the finite-difference time-domain (FDTD) method. Two types of discretization of the linear governing equations, the scalar-type FDTD method and the vector-type one, are first discussed. Then the basic concept of the compact explicit-FDTD (CE-FDTD) method is described. By considering the relationship between the cutoff frequency and the computer resources, it is shown that the interpolated wide band scheme requires the least computer resources among the derivative schemes of the CE-FDTD method. The discretization of the arbitrary shaped sound field by voxels and its boundary conditions, and the implementation of the density variation are also described. The sound field rendering and its real time renderer "Silicon concert hall" are introduced.

关键词： finite-difference time-domain method compact explicit FDTD method sound field rendering Silicon concert hall SUF2VOX voxelizer

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Propagation Model of Very Low Frequency Waves in the Ionosphere 14

Propagation Model of Very Low Frequency Waves in the Ionosph...

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14th International Symposium on Antennas Propagation and EM Theory

作者： Wu, Yiyun Liu, Moran Zhou, Chen Wuhan Univ Sch Elect Informat Wuhan Peoples R China

ISBN: (纸本)9798350353129;9798350353136

Based on the finite-difference time-domain method with inhomogeneous grid and GPU parallel computing, this paper establishes the propagation model of very low frequency (VLF) waves in the ionosphere. The model can flexibly modify ionospheric parameters and simulate the propagation of VLF waves under different ionospheric conditions. This model provides theoretical support for the wide application of VLF waves in the ionosphere and the understanding of the mechanism of the whistler wave in the ionosphere.

关键词： ionosphere electromagnetic wave propagation finite-difference time-domain method very low frequency wave magnetized cold plasma

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Computation of Lightning-Induced Voltages Considering Ground Impedance of Multi-Conductor Line for Lossy Dispersive Soil

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IEEE TRANSACTIONS ON POWER DELIVERY 2022年第4期37卷 2464-2473页

作者： Rizk, Mohammad E. M. Abulanwar, Sayed Ghanem, Abdelhady Lehtonen, Matti Mansoura Univ Dept Elect Engn Fac Engn Mansoura 35516 Egypt Aalto Univ Dept Elect Engn & Automat Espoo 02150 Finland

Soil conductivity and permittivity have a substantial influence on lightning-electromagnetic transients in power system. In this paper, lightning-induced voltages are computed on a multi-conductor overhead line due to nearby first and subsequent return strokes. Besides, this study considers the longitudinal complex inductance of the line due to the penetration depth of electromagnetic fields through finitely conducting ground as well as the frequency dependent soil parameters using the finite-difference time-domain method. Various case studies in light of variations of return stroke velocity, line height, and soil conductivity are explored for thoughtful investigations. The obtained results reveal that the influence of this complex inductance on peak values of lightning induced voltages changes with varying the return stroke velocity. Also, the frequency dependence of soil parameters markedly impacts the computed lightning-induced voltages particularly for poor soil conductivity.

关键词： Soil Computational modeling time-domain analysis finite difference methods Conductivity Frequency dependence Rats finite-difference time-domain method frequency dependent soil parameters lightning-induced voltages

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Optical sensing in single-mode filters base on surface plasmon H-shaped cavities

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OPTICS COMMUNICATIONS 2022年 505卷

作者： Khani, Shiva Hayati, Mohsen Razi Univ Fac Engn Elect Engn Dept Kermanshah *** Iran

Three novel refractive index (RI) sensors based on one, two, and three H-shaped cavities (HCs) and metal- insulator-metal (MIM) waveguides are proposed in this paper. By coupling more than one HC (two and three), the Q-factor and then the FOM value of the designed RI sensors increase. A well-known method for increasing the sharpness transition between the passband and stopband of a spectrum is coupling cavities together. Fortunately, the proposed HC has such a property that increases the FOM value. The maximum obtained FOM of the proposed sensors using one, two, and three HCs reached 69.5, 100.19, and 108.36 RIU-1, respectively. Three proposed plasmonic structures which are used to design RI sensors have single-mode spectra in a wide wavelength range of 500 to 2000 nm. A single-mode spectrum is easier to cope with in circuits with higher complexity such as RI sensors. The metal and insulator materials that are used in the designed structures are silver and air, respectively. The finite-difference time-domain (FDTD) method is used for the numerical investigation of the proposed RI sensors. To verify FDTD simulations, the basic rectangular cavity which is used to design HC is analyzed using an analytical method. In summary, the benefits of the proposed RI sensors are having single-mode spectra in a wide wavelength range and also their simple structures. The proposed topology easily be redesigned and adapted with different numbers of HCs without disturbing its single-mode spectrum to achieve various FOM values. Furthermore, considering the fact that the proposed cavity is based on rectangular shapes, it has a simple fabrication process. Taking into account the mentioned advantages of the proposed structures, they can be used in integrated optical circuits for optical communication purposes.

关键词： Surface plasmon polaritons Refractive index sensor H-shaped cavity Metal-insulator-metal waveguide finite-difference time-domain method

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Orbit-Orbit Interaction of Light: Harnessing Vortex-Trajectory Interplay for Light Manipulation

Orbit-Orbit Interaction of Light: Harnessing Vortex-Trajecto...

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CLEO: Fundamental Science, CLEO:FS 2024 - Part of Conference on Lasers and Electro-Optics, CLEO 2024

作者： Chaudhary, Raghvendra P. Reiner, Avraham Shitrit, Nir School of Electrical and Computer Engineering Ben-Gurion University of the Negev Beer Sheva8410501 Israel

We report the orbit-orbit interaction of light in a plasmonic ellipse cavity, whose unique geometry facilitates vortex-trajectory interplay. This interaction opens a new paradigm for light manipulation by leveraging t... 详细信息

ISBN: (纸本)9781957171395

关键词： Circular polarization finite-difference time-domain method Light beams Optical vortex beams Optical vortices Orbital angular momentum multiplexing

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Error-Controllable Scheme for the LOD-FDTD method

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IEEE JOURNAL ON MULTISCALE AND MULTIPHYSICS COMPUTATIONAL TECHNIQUES 2022年 7卷 135-141页

作者： Nakazawa, Tasuku Wu, Di Kishimoto, Seiya Shibayama, Jun Yamauchi, Junji Ohnuki, Shinichiro Nihon Univ Coll Sci & Technol Tokyo 1018308 Japan Hosei Univ Fac Sci & Engn Koganei Tokyo 1848584 Japan

The implicit locally one-dimensional finite-difference time-domain (LOD-FDTD) method is useful for designing plasmonic devices and waveguide structures. By using a large timestep size, the implicit LOD-FDTD method can reduce the computational time;however, this involves a trade-off with accuracy. To overcome this trade-off, we propose an error-controllable scheme for the LOD-FDTD method, wherein the fast inverse Laplace transform is employed to generate the electromagnetic field in arbitrary time domain from that in complex frequency domain. Compared to the conventional LOD-FDTD method, our scheme provides higher accuracy with more efficient calculations.

关键词： finite difference methods time-domain analysis Mathematical models Gold Frequency-domain analysis Dispersion Computational modeling Error control fast inverse laplace transform finite-difference complex-frequency-domain method finite-difference time-domain method locally one-dimensional method parallel computing plasmonic device

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A Single-Celled Design Approach for Tri-Channel Metalenses

A Single-Celled Design Approach for Tri-Channel Metalenses

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CLEO: Fundamental Science, CLEO:FS 2024 - Part of Conference on Lasers and Electro-Optics, CLEO 2024

作者： Guo, Xudong Wong, Kenneth K.Y. Department of Electrical and Electronic Engineering The University of Hong Kong Pokfulam Road 999077 Hong Kong Advanced Biomedical Instrumentation Centre Hong Kong Science Park New Territories Shatin Hong Kong

We present a non-interleaved single-celled design approach for tri-channel metalenses. We encode each meta-atom with three independent phase responses to generate three different spin-selective metalenses, which enabl... 详细信息

ISBN: (纸本)9781957171395

关键词： finite-difference time-domain method Metasurfaces Optical imaging Optical manipulation Phase Segmentation

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Photovoltaic Nano-Concentrator Integrated with Graphene Metamaterial for Energy Harvesting

Photovoltaic Nano-Concentrator Integrated with Graphene Meta...

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

作者： Awad, Ehab Electrical Engineering Department College of Engineering King Saud University Riyadh11421 Saudi Arabia

ISBN: (纸本)9781957171296

An extended-bandwidth solar concentrator with 60nm spot-focusing is presented. It enhances the optical absorption of graphene mesh-like metamaterial for applications in photovoltaic energy harvesting. The concentrator has a compact-size, flat spectral response, and polarization-insensitive operation. © Optica Publishing Group 2023, © 2023 The Author(s)

关键词： finite-difference time-domain method Graphene Optical absorption Solar cells Solar concentrators Surface plasmon polaritons

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