- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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One-Step Leapfrog HIE-FDTD for Drude Media
摘要： A one-step leapfrog hybrid implicit–explicit finite-difference time-domain (HIE-FDTD) method is developed for Drude dispersive media. The Drude media is modeled through a current source characterized by a semi-implicit auxiliary differential equation. The stability condition is the same as that of conventional leapfrog HIE-FDTD and is determined by the grid cell size along only one direction. The proposed method is used to efficiently investigate the properties of surface plasmon polaritons propagating along a one-atom-thick graphene sheet in low terahertz band with a very fine grid.
关键词： Drude dispersive media,graphene,hybrid implicit–explicit finite-difference time-domain method,one-step leapfrog,stability
更新于2025-09-23 15:22:29
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[IEEE 2018 International Conference on Electronics, Control, Optimization and Computer Science (ICECOCS) - Kenitra, Morocco (2018.12.5-2018.12.6)] 2018 International Conference on Electronics, Control, Optimization and Computer Science (ICECOCS) - Modelling of optical pulse propagation in Kerr and Raman nonlinear dispersive media using GVADE - TLM method
摘要： In this paper, we propose a simulation model of electromagnetic wave's propagation in dispersive media using Transmission Line Matrix method with the symmetrical condensed node (SCN -TLM) and novel voltage sources. The proposed model, named GVADE-TLM, allows the simulation of optical pulses propagation in nonlinear optical medium, by solving Maxwell's equation and the polarization current density. The model is applied to problems where the electric field is not constrained to a single vector component. The scattering matrix characterizing the SCN with the new voltage sources is provided and the numerical results are compared with those of the literature or with the theoretical ones.
关键词： nonlinear dispersive media,transmission-line-matrix (TLM),GVADE-TLM method,SCN
更新于2025-09-19 17:15:36
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[IEEE 2019 URSI International Symposium on Electromagnetic Theory (EMTS) - San Diego, CA, USA (2019.5.27-2019.5.31)] 2019 URSI International Symposium on Electromagnetic Theory (EMTS) - On the optimal plasmonic resonances in gold nanospheres embedded in dispersive media
摘要： New fundamental upper bounds have recently been given regarding the optimal plasmonic multipole resonances of a rotationally invariant sphere embedded in a lossy surrounding medium. The new theory is based on a generalized optical theorem for the absorption of a sphere in a lossy medium and employs straightforward analysis to explicitly maximize a concave function. The new bounds are briefly summarized in this paper and then employed in a study concerning the effectiveness of using gold nanospheres as absorbers of the sizes typically used in biomedical applications and plasmonic photothermal therapy.
关键词： plasmonic resonances,gold nanospheres,dispersive media,multipole absorption,photothermal therapy
更新于2025-09-16 10:30:52
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[IEEE 2019 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting - Atlanta, GA, USA (2019.7.7-2019.7.12)] 2019 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting - Generalized Tensor FDTD Method for Sloped Plasmonic Interfaces
摘要： A tensor finite-difference time-domain (FDTD) method for sloped interfaces is generalized to dispersive media and applied to the study of plasmonic periodic structures formed by silver nanorods. Conventional staircased FDTD exhibits poor convergence properties in this situation, as plasmonic fields are strongly localized right where staircasing errors occur, namely at the air-silver interface. Alternative methods that have been proposed for this problem include the use of a triangular mesh or effective permittivity models that lead to a fourth-order auxiliary differential equation (ADE) connecting D and E at the interface. The proposed approach offers high accuracy, still employing a rectangular FDTD mesh, thus striking a very appealing balance between accuracy and computational efficiency.
关键词： numerical techniques,plasmonic interfaces,tensor FDTD,silver nanorods,dispersive media
更新于2025-09-11 14:15:04
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One-Step Leapfrog ADI-FDTD Method Using the Complex-Conjugate Pole-Residue Pairs Dispersion Model
摘要： A novel one-step leapfrog alternating-direction-implicit finite-difference time-domain method for the modeling of dispersive media described by the complex-conjugate pole-residue pairs model is proposed. The efficiency of the technique is demonstrated in benchmark numerical examples.
关键词： finite-difference time-domain (FDTD) method,leapfrog alternating-direction-implicit (LADI) scheme,Dispersive media
更新于2025-09-11 14:15:04
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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - A Liquid with Tuneable Dielectric Properties for Wideband Microwave Sensing of Biological Targets
摘要： Biomedical microwave systems require antenna-to-body matching to transfer electromagnetic energy efficiently through the skin and inside the body. In this paper a paraffin oil and saline water based matching liquid is presented that can be modified in a straight-forward manner to match various dielectrics. The permittivity of this liquid may be varied between 10-52 by altering the proportions of paraffin oil to water. The conductivity can be varied between 0.3 and 1.0S/m (at 3GHz) by altering the salinity of the water, without significantly altering the permittivity. Dielectric measurements and one- and two-pole Debye parameters are given for a range of different mixtures at frequencies of 0.5-10GHz. The results highlight the flexibility of the matching liquid and mark it as a suitable antenna coupling medium as well as a biological phantom material in the low GHz range.
关键词： Biomedical signal processing,Dispersive media,Microwave imaging
更新于2025-09-04 15:30:14