高品质宽度调制光子晶体叠层模隙腔及其在折射率传感中的应用。

High-Q width modulated photonic crystal stack mode-gap cavity and its application to refractive index sensing.

作者信息

Yao Kaiyuan, Shi Yaocheng

机构信息

Centre for Optical and Electromagnetic Research, State Key Laboratory for Modern Optical Instrumentation, Zhejiang Provincial Key Laboratory for Sensing Technologies, Zhejiang University, Zijingang Campus, Hangzhou, China.

出版信息

Opt Express. 2012 Nov 19;20(24):27039-44. doi: 10.1364/OE.20.027039.

DOI:10.1364/OE.20.027039

PMID:23187559

Abstract

An optical sensor based on One-Dimensional photonic crystal (1D PhC) stack mode-gap cavity has been designed, fabricated and characterized. By introducing quadratically modulated width tapering structure, a waveguide coupled 1D PhC stack mode-gap cavity with calculated Q-factor 1.74 × 10(7) and an effective mode volume 1.48(λ/n(Si))(3) has been designed. This cavity has been used for sensing applications by immersing into water-ethanol mixture of different volume concentrations. Transmission measurement shows a quality factor as high as 27, 000 can be achieved for the cavity immersed in analytes. A sensitivity of 269nm/RIU has been demonstrated.

摘要

一种基于一维光子晶体（1D PhC）堆叠模隙腔的光学传感器已被设计、制造和表征。通过引入二次调制的宽度渐变结构，设计了一种波导耦合的1D PhC堆叠模隙腔，其计算品质因数为1.74×10⁷，有效模体积为1.48(λ/n(Si))³ 。该腔已通过浸入不同体积浓度的水 - 乙醇混合物用于传感应用。透射测量表明，浸入分析物中的腔可以实现高达27000的品质因数。已证明灵敏度为269nm/RIU。