
Proceedings Paper
High accuracy models of sources in FDTD computations for subwavelength photonics design simulationsFormat | Member Price | Non-Member Price |
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Paper Abstract
The simple source model used in the conventional finite difference time domain (FDTD) algorithm gives rise to large
errors. Conventional second-order FDTD has large errors (order h**2/ 12), h = grid spacing), and the errors due to the
source model further increase this error. Nonstandard (NS) FDTD, based on a superposition of second-order finite
differences, has been demonstrated to give much higher accuracy than conventional FDTD for the sourceless wave
equation and Maxwell’s equations (h**6 / 24192). Since the Green’s function for the wave equation in free space is
known, we can compute the field due to a point source. This analytical solution is inserted into the NS finite difference
(FD) model and the parameters of the source model are adjusted so that the FDTD solution matches the analytical one.
To derive the scattered field source model, we use the NS-FD model of the total field and of the incident field to deduce
the correct source model. We find that sources that generate a scattered field must be modeled differently from ones
radiate into free space. We demonstrate the high accuracy of our source models by comparing with analytical solutions.
This approach yields a significant improvement inaccuracy, especially for the scattered field, where we verified the
results against Mie theory. The computation time and memory requirements are about the same as for conventional
FDTD. We apply these developments to solve propagation problems in subwavelength structures.
Paper Details
Date Published: 10 September 2014
PDF: 11 pages
Proc. SPIE 9163, Plasmonics: Metallic Nanostructures and Their Optical Properties XII, 91630A (10 September 2014); doi: 10.1117/12.2061838
Published in SPIE Proceedings Vol. 9163:
Plasmonics: Metallic Nanostructures and Their Optical Properties XII
Allan D. Boardman, Editor(s)
PDF: 11 pages
Proc. SPIE 9163, Plasmonics: Metallic Nanostructures and Their Optical Properties XII, 91630A (10 September 2014); doi: 10.1117/12.2061838
Show Author Affiliations
James B. Cole, Univ. of Tsukuba (Japan)
Saswatee Banerjee, Sumitomo Chemical Co., Ltd. (Japan)
Published in SPIE Proceedings Vol. 9163:
Plasmonics: Metallic Nanostructures and Their Optical Properties XII
Allan D. Boardman, Editor(s)
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