Multiple Fano resonances in metallic arrays of asymmetric dual stripes

被引:24
作者
Chen, Yu-Tang [2 ,3 ]
Chern, Ruey-Lin [1 ]
Lin, Hoang-Yan [2 ,3 ]
机构
[1] Natl Taiwan Univ, Inst Appl Mech, Taipei 106, Taiwan
[2] Natl Taiwan Univ, Grad Inst Photon & Optoelect, Taipei 106, Taiwan
[3] Natl Taiwan Univ, Dept Elect Engn, Taipei 106, Taiwan
关键词
D O I
10.1364/AO.49.002819
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
Characteristics of Fano resonances in metallic arrays of asymmetric dual stripes are theoretically investigated. The structure consists of two perfect metal stripes with unequal sizes in a unit cell. In addition to the total reflection that usually occurs in single-stripe arrays, the dual-stripe arrays exhibit two extra pairs of reflection peaks and dips, which are identified as the Fano resonance with the reflection line shape characterized by a Fano formula. In particular, the peak-dip pair on the high-frequency side is recognized as the high-order Fano resonance, as compared to its counterpart on the low-frequency side. Features of the Fano resonances are further illustrated with the electric field and surface current patterns at the corresponding frequencies. The underlying mechanism of multiple Fano resonances in the dual-stripe arrays is also discussed. (C) 2010 Optical Society of America
引用
收藏
页码:2819 / 2826
页数:8
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