Finite-Difference Time-Domain Analysis of Microresonators and Metallic Subwavelength Aperture Structures
Date Issued
2005
Date
2005
Author(s)
Liu, Yao-Jen
DOI
en-US
Abstract
In this research, the finite-difference time-domain (FDTD) method is employed to simulate several categories of devices with the appearance of the mathematic motivated perfectly matching layer (PML) around the computational
domain. First, the micro-ring and square micro-ring resonators are analyzed. The issue of proper grid arrangement over the modelled structures for efficient numerical convergence is discussed. We discover that putting the electric field grid just at the boundary of dielectric interfaces and taking the index average of the grid provide the best results in the cases we concern.
Two geometries of micro-ring resonator coupled by straight waveguides are simulated with the slab index of 3.2 and the cladding index of 1.0. Second, the surface plasmons (SPs) and the metallic subwavelength apertures are discussed. Several structures are analyzed by imposing the Drude model for material dispersion into the FDTD scheme to model the metal in the optical and microwave ranges. The enhancement of transmittance and the directional property are shown through the simulations. Beside simulation of various devices, we also implement a PML modified by nonlinear and dispersive model. The modified PML can be used to truncate the computational domain of modelling a nonlinear-dispersive medium to properly absorb the outgoing waves.
Subjects
有限差分時域法
微共振器
次波長孔隙
FDTD
Microresonator
Subwavelength Aperture
Type
thesis
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