Perpendicular coupler for whispering-gallery resonators

被引：18

作者：

Shu, Fang-Jie ^{[1
]}

Zou, Chang-Ling ^{[2
]}

Sun, Fang-Wen ^{[2
]}

机构：

[1] Shangqiu Normal Univ, Dept Phys, Shangqiu 476000, Peoples R China

[2] Univ Sci & Technol China, Key Lab Quantum Informat, Anhua 230026, Peoples R China

来源：

OPTICS LETTERS | 2012年 / 37卷 / 15期

基金：

中国国家自然科学基金;

关键词：

TAPER; MICROLASER;

D O I：

10.1364/OL.37.003123

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

In this Letter, we report on a perpendicular coupler (PC) for whispering-gallery resonators; it is a near field waveguide optimized for high coupling efficiency. The PC provides highly efficient tunneling coupling between the waveguide and microresonator without the need of a phase matching condition, and saves space for integration components. Compared to the Lorentz-shape in the transmission spectrum of the parallel coupler, the reflection spectrum of the PC shows an asymmetric Fano-shape near resonance. Furthermore, we demonstrate that the collection efficiency can be enhanced by near field scatterers, with a maximal efficiency of about 75%. Our simulations show that the PC is not sensitive to most parameters (including the refractive index of the waveguide), which makes the PC optimal for the application of whispering-gallery modes. (c) 2012 Optical Society of America

引用

页码：3123 / 3125

页数：3

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