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Ultra-fast all-optical plasmonic switching in near infra-red spectrum using a Kerr nonlinear ring resonator

OPTICS COMMUNICATIONS 2018年 410卷 142-147页

作者： Nurmohammadi, Tofiq Abbasian, Karim Yadipour, Reza Univ Tabriz Fac Elect & Comp Engn Tabriz Iran Univ Tabriz Sch Engn Emerging Technol Tabriz *** Iran

In this paper, an all-optical plasmonic switch based on metal-insulator-metal (MIM) nanoplasmonic waveguide with a Kerr nonlinear ring resonator is introduced and studied. Two-dimensional simulations utilizing the finite-difference time-domain algorithm are used to demonstrate an apparent optical bistability and significant switching mechanisms (in enabled-low condition: T (ON/OFF) = 21.9 and in enabled-high condition: T (ON/OFF) = 24.9) of the signal light arisen by altering the pump-light intensity. The proposed all-optical switching demonstrates femtosecond-scale feedback time (90 fs) and then ultra-fast switching can be achieved. The offered all-optical switch may recognize potential significant applications in integrated optical circuits. (c) 2017 Elsevier B.V. All rights reserved.

关键词： Telecom wavelength Optical bistablity fdtd algorithm

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Optimization of electron bunch injection in dielectric laser acceleration

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OPTIK 2018年 169卷 27-32页

作者： Mehrbani, Samaneh Mirzanejhad, Saeed Ghadi, Amin Univ Mazandaran Fac Basic Sci Dept Atom & Mol Phys Babol Sar Iran

Dielectric laser acceleration (DLA) is new cheap and miniature laser acceleration scheme for acceleration of charged particles in the vicinity of the dielectric grating. In this paper injection characteristics of the electron bunch in a single fused silica grating based-structure with period lambda(g) = 260 nm is analyzed. Optimum aspect ratios of the grating width d/lambda g and height h/lambda g are obtained for the first surface mode harmonic. Simulation results of the injected electron dynamics show that there are two lateral positions (y = 1.75 and y = 2.6 mu m) that the final electron energy is maximized. Existence of these two lateral positions increases flexibility of the injection process. In other words, injection can be made in the range of 1.4 < y(mu m) < 2.8 with two peaks of energy. Finally, injection of Gaussian electron bunch at each two optimum transverse positions is investigated by a numerical simulation. The initial momentum distribution is assumed to be Gaussian around the mean resonance velocity (beta = lambda g/lambda = 0.33). The initial longitudinal and transverse emittance of the electron bunch are selected as epsilon vertical bar vertical bar = (delta E/E) = 0.01 and, epsilon(perpendicular to) = 3 mu mmrad respectively. The net energy gain in the fifty grating periods is 2.03 keV (2.225 keV) and acceleration gradient for each injection position is about 160 MeV/m.

关键词： Dielectric laser acceleration Electron injection Electron bunch fdtd algorithm

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High accuracy simulations of optical propagation in nanophotonic devices

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MICRON 2007年第2期38卷 109-114页

作者： Cole, James B. Banerjee, Saswatee Rungsawang, Rakchanok Univ Tsukuba Dept Syst & Informat Engn Tsukuba Ibaraki 3058573 Japan Univ Tsukuba Inst Appl Phys Tsukuba Ibaraki 3058573 Japan

We introduce a new high accuracy second-order finite-difference time-domain (fdtd) algorithm based on non-standard finite differences, and use it to investigate light propagation in subwavelength structures such as ph... 详细信息

关键词： fdtd algorithm optical propagation nanophotonic devices

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Realizing high-performance four active plasmonic filters using a single structure

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SCIENTIFIC REPORTS 2024年第1期14卷 1-8页

作者： Elbialy, Samar El-den, B. M. Ashraf, Eman Delta Univ Sci & Technol Fac Engn Elect & Commun Dept Gamasa Egypt

This research aims to contribute significantly to the field of plasmonic filtering technology within modern optical communication systems. By focusing on the development of a high-performance, more compact, and efficient design, this study explores the potential of hybrid plasmonic filters to revolutionize optical filtering applications. The approach leverages an innovative active material with electrically tunable permittivity, allowing for dynamic control over the filter's optical properties. The research specifically examines four types of filters: low-pass filters (LPF), high-pass filters (HPF), band-pass filters (BPF), and band-reject filters (BRF). These filters are designed to operate effectively across a broad wavelength range of 1200-1800 nm, achieving a transmittance exceeding 98% at the output port, while maintaining isolation with transmittance below 2% at the isolated ports. The structure demonstrates a FWHM of approximately 216 nm for the band-pass filter and approximately 223 nm for the band-reject filter, which are considered moderate values, ensuring the versatility and multifunctionality of the design. The ultra-compact size, with a footprint of just 21 mu m2, makes these filters particularly advantageous for integration into space-constrained optical communication systems.

关键词： Plasmonic filter Photonic integrated circuits Full-width half maximum (FWHM) Hybrid plasmonic waveguides fdtd algorithm

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An explicit and absolutely stable fdtd method for electromagnetic analysis

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IEICE ELECTRONICS EXPRESS 2022年第6期19卷 20210564-20210564页

作者： Chen, Faxiang Li, Kang Shandong Univ Sch Informat Sci & Engn Qingdao 266237 Peoples R China

In this letter, an explicit and absolutely stable finite-difference time-domain (fdtd) algorithm is designed for electromagnetic analysis. The algorithm works through a structure composed of several vectors and matrices acting on these vectors. Excitation source is linearly approximated in a time interval, fields in the computation domain are expressed by a vector, and these matrices are derived based on the fdtd method. The proposed algorithm solves electromagnetic problems in an explicit way, its time step size is beyond the Courant-Friedrich-Levy (CFL) stability condition and the computation efficiency of the proposed method is also higher than the conventional fdtd method. Two numerical examples are tested and validate that the proposed algorithm can solve electromagnetic problems correctly and also improves calculation efficiency.

关键词： explicit absolutely stable fdtd algorithm CFL

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Simulation analysis based on Finite- Difference Time-Domain algorithm for GIS partial discharge detection

Simulation analysis based on Finite- Difference Time-Domain ...

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3rd International Conference on Advanced Design and Manufacturing Engineering (ADME 2013)

作者： Liu Qiu-ping Wang Xu-hong Human Elect Power Corp Maintenance Changsha Hunan Peoples R China Changsha Univ Sci & Technol Coll Elect & Informat Engn Changsha Peoples R China

ISBN: (纸本)9783037858431

Gas insulated switchgear (GIS) has been widely used in global power grids currently. However, there are several disadvantages of GIS which will cause partial discharge (PD) in the insulation and then make GIS shut down. In this paper, the application of the ultra high frequency (UHF) method for partial discharge monitoring is discussed in detail, including the placement of the UHF sensors, detection system and the different characteristics of the different defects in the PD signals diagram are analyzed as well. Finally, some relevant conclusions are drawn based on Finite-Diffrenee Time-Domain algorithm (fdtd) for simulation of the electromagnetic waves by UHF PD detection technology.

关键词： GIS PD UHF PD detection fdtd algorithm simulation analysis

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Design of a plasmonic MIM filter based on ring resonator incorporating circular air holes 29

Design of a plasmonic MIM filter based on ring resonator inc...

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29th Iranian Conference on Electrical Engineering (ICEE)

作者： Shafagh, Sara Gholinezhad Kaatuzian, Hassan Danaie, Mohammad Amirkabir Univ Technol Photon Res Lab PRL Dept Elect Engn Tehran Iran Semnan Univ Fac Elect & Comp Engn Semnan Iran

ISBN: (纸本)9781665433655

A new plasmonic metal-insulator-metal (MIM) band pass filter has been proposed. This paper has shown some advantages of this novel design, which includes circular air holes, and works in a longer wavelength as well as is sensitive to the size parameters of circular air holes and the resonator. The proposed structure has a multiple-mode with two resonance wavelengths;each of them has reached an acceptable transmission peak and a higher-quality factor than the previous structures. The main advantages of this plasmonic filter combined with air holes are to present a dual-mode filter with a sharp transmission in the wavelength range from 700 to 2000 nm. The size of the geometrical parameters in this structure will be adjusted in order to successfully achieve this aim. Subsequently, the characteristics of the proposed novel filter will be improved. The proposed structure has been investigated numerically utilizing the finite difference time domain (fdtd) method and the Drude model has been used for the modeling of the metal in the structure. Our device produces the maximum quality factor (Q-Factor) as well as the minimum FWHM by the values of 62.79 and 13.13, respectively. Also, the bandwidth of the structure is smaller than the previous structures. Moreover, a higher peak of transmittance (T-max) is 70% and the longer resonance wavelength is obtained at 1754 nm. This device is a good candidate for filtering applications which is used in optical circuits.

关键词： Surface Plasmon Polaritons Plasmonics Circular air holes Muultiple-mode Transmittance Quality factor Band Pass Filter fdtd algorithm Drude model

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Efficiency Enhancement in the thin film GaAs solar cell using Photonic Crystal as a back reflector

Efficiency Enhancement in the thin film GaAs solar cell usin...

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Workshop on Recent Advances in Photonics (WRAP)

作者： Gupta, Nikhil Deep Janyani, Vijay Malaviya Natl Inst Technol Elect & Commun Engn Dept Jaipur Rajasthan India

ISBN: (纸本)9781479948628

Light trapping in the thin film solar cell has been studied for a while and is considered as among the most important parameter which may reduce the gap between the most efficient single junction thin film solar cell available till date and the theoretical Shockley-Queisser (SQ) Limit. Usually, metallic back reflectors are being used for the thin film solar cells. Here we are presenting an alternative method for single junction thin film GaAs solar cell using photonic crystals as a back reflecting mirror. We have used the photonic crystals (PhC) structure having GaAs rods having SiO2 in the background, which has improved absorption in the near band edge wavelength. The results of the numerical modelling using fdtd algorithm clearly indicate the efficiency improvement as compared to the metallic reflector as back mirror material.

关键词： Light trapping Ssolar cells fdtd algorithm Photonic crystals

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A Comparative Study of Hardware Acceleration Techniques In Computational Electromagnetics (CEM)

A Comparative Study of Hardware Acceleration Techniques In C...

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2010 IEEE International Symposium Antennas and Propagation/CNC-USNC/URSI Radio Science Meeting

作者： Yu, Wenhua Liu, Yongjun Yang, Xiaoling Muto, Akira Mittra, Raj EE E 319 University Pk PA 16802 USA Sony Corp R&D Adv Matl Lab Tokyo Japan

ISBN: (纸本)9781424449682

In this paper, we discuss some of the new developments in parallel processing techniques in the context of computational electromagnetics. We present the results of a performance study of the parallel fdtd algorithm running on various hardware platforms, such as a high performance cluster, a PC cluster, multi-core processor, GPU, and IBM CELL processor, for both Windows and Linux operating systems. The results show that the fdtd method is extremely well suited for parallel platforms.

关键词： fdtd algorithm GPU IBM CELL processor PC cluster computational electromagnetics computational electromagnetics finite difference time-domain analysis hardware acceleration techniques hardware platforms high performance cluster multi-core processor parallel processing techniques

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Design and Simulation of an All-Optical Plasmonic Fano Switch 28

Design and Simulation of an All-Optical Plasmonic Fano Switc...

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28th Iranian Conference on Electrical Engineering (ICEE)

作者： Karimi, Yousef Kaatuzian, Hassan Amirkabir Univ Technol Tehran Polytech Dept Elect Engn Photon Res Lab PRL Tehran Iran

ISBN: (纸本)9781728172965

The optical switch is a crucial component in optical communications that plays an important role in transmitting the optical signal within a photonic circuit. In this paper, an all-optical plasmonic switch composed of five nanodisks made from gold, planted inside SiO2 substrate, based on Fano resonance, has been proposed. The simulation results disclose that the structure can work as an infrared optical switch by adjusting the pump light at 825 nm wavelength. The occurrence of the second Fano resonance (FR) due to the reduction in the distance between nanodisks was reviewed. The two-dimensional simulations using the finite-difference time-domain algorithm are utilized to reveal apparent optical bistability and notable switching mechanism of the signal light. The results show -4.00 dB and -36.84 dB transmissions when the pump is OFF and ON, respectively. As known, in highly integrated optical communication, ultrasmall all-optical switches are of great importance. This switch has a nanoscale size of 450 nmx450 nm.

关键词： Plasmonics Surface Plasmon Resonance Fano Resonance All-Optical Switch fdtd algorithm

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