Metallic diffraction grating enhanced coupling in whispering gallery resonator

被引：13
|
作者：
Zhou, Yanyan [1 ,2 ]
Yu, Xia [1 ]
Zhang, Haixi [3 ]
Luan, Feng [2 ]
机构：
[1] Singapore Inst Mfg Technol, Precis Measurements Grp, Singapore 638075, Singapore
[2] Nanyang Technol Univ, Sch Elect & Elect Engn, Singapore 639798, Singapore
[3] Chinese Univ Hong Kong, Dept Elect Engn, Shatin 852, Hong Kong, Peoples R China
来源：
OPTICS EXPRESS | 2013年 / 21卷 / 07期
关键词：
MODES; FIBER; MICRORESONATORS; EXCITATION; RESONANCES; SURFACE; CAVITY; RING;
D O I：
10.1364/OE.21.008939
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
For the first time, metallic diffraction grating is investigated to enable efficient coupling in the whispering gallery resonator (WGR). Six-fold field enhancement in the resonator is achieved with respect to their dielectric counter-parts. This higher coupling efficiency is attributed to the surface plasmon excitation which drives the whispering gallery mode along the grating. Fano resonances have been observed in optical reflection. With the metallic grating, single-port end-fire WGR configuration becomes possible - a scheme that has not been demonstrated in any other WGR coupling devices. Hence, it serves as a prototype for portable whispering gallery devices potentially useful in sensing, switching and nonlinear applications. (C) 2013 Optical Society of America
引用
收藏
页码：8939 / 8944
页数：6
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