Enhancement of the extraordinary optical transmission in a subwavelength metal slit dressed by a metal grating

被引：8
|
作者：
Zhou, Yun-Song [1 ]
Gu, Ben-Yuan [2 ]
Wang, Huai-Yu [3 ]
Zhao, Li-Ming [1 ]
机构：
[1] Capital Normal Univ, Dept Phys, Ctr Theoret Phys, Beijing 100048, Peoples R China
[2] Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China
[3] Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China
来源：
PHYSICAL REVIEW A | 2010年 / 81卷 / 03期
基金：
中国国家自然科学基金;
关键词：
D O I：
10.1103/PhysRevA.81.035803
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We propose a dressed subwavelength metal slit structure, which is formed by adding a thin metallic grating near the slit entrance with a distance. The simulation computation by means of the finite-difference time-domain method shows that the transmissivity can be substantially enhanced by 30 times compared with the conventional metal slit structure. The transmission spectrum exhibits two characters of the Fabry-Perot resonance and a left-shift. The introduced grating has two effects: (1) more energy is collected from the incident plane, and (2) the effective dielectric region in the slit is extended to the region out of the entrance.
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页数：3
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