Browsing by Author "Lee, H. M."

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A wide-angle dual-band infrared perfect absorber based on metal-dielectric-metal split square-ring and square array
(2012-05-23)
Lee, H. M.
;
Wu, J. C.
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物理研究所
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Institute of Physics
The optical properties of a dual-band plasmonic absorber are delineated numerically by employing a finite element method. Based on a metal-dielectric-metal scheme, the key structure consists of a lossless dielectric layer that is sandwiched by a silver split square-ring enclosing a silver square array and ground silver plane. The simulation results clearly show that near-perfect absorption efficiency can be realized for two absorption bands in the near-infrared wavelength range. The near-perfect absorption bands exhibit polarization insensitivity and wide-angle incidence. Notably, the absorption band is independently governed by the size of each part of the patterned films where the silver split square-ring determines the shorter wavelength band and the silver square determines the longer wavelength band, respectively. The repositioning of two near-perfect absorption peaks possesses a linear relationship that is related to the dimensions of the patterned silver layer. This allows for a flexible reconfigurability over the entire near-infrared regime.
P-channel SONOS transient current modeling for program and erase
(2006)
Du, Pei-Ying
;
Guo, Jyh-Chyurn
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Lee, H. M.
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Chen, H. M.
;
Shen, Rick
Transient current models with time and field dependence are proposed. The time dependence follows asymptotic t(-1) behavior with slower tunneling rate for erase (ERS) than program (PGM). The field dependence follows FN tunneling in higher field for PGM and intermediate field for ERS with relatively higher corner field for saturation. The models have been justified for P-channel SONOS (P-SONOS) with splits of ONO scheme.