改进长周期波导光栅折射率传感特性的研究  

Study on improving the performance of the refractive index sensor based on long-period waveguide gratings

作　　者：王子豪[1] 杨利[1] 

机构地区：[1]中国科学技术大学电子工程与信息科学系,安徽合肥230027

出　　处：《量子电子学报》2007年第4期500-504,共5页Chinese Journal of Quantum Electronics

基　　金：中国科学院优秀博士后科研启动基金资助

摘　　要：提出了一种附加高折射率覆盖层的长周期波导光栅折射率传感器结构。通过模拟外折射率变化所引起的高阶模式等效折射率的改变以及该高阶模式与基模相耦合的谐振波长的漂移,研究了长周期波导光栅对外界环境折射率的传感特性。模拟表明,高折射率外覆盖层的加入会使得原有的覆盖层高阶模式发生重组,高阶模式等效折射率和模式耦合的谐振波长随之发生跳变。此时,长周期波导光栅外折射率传感器的敏感度和工作范围将极大地提高。A novel ambient refractive index sensor based on long period waveguide grating （LPWG） with a higher refractive index overlayer is proposed and investigated. The response of LPWG sensor to ambient refractive index change is simulated by studying the shift of resonance wavelength caused by the corresponding change of effective refractive index of a certain higher-order mode. It is shown that the deposition of the overlayer will lead to the rerganization of high-order modes and then an abrupt change of the effective refractive index of the higher-order mode, which will greatly improve the sensitivity and operation range of LPWG refractive index sensor.

关 键 词：纤维和波导光学 长周期波导光栅 折射率传感 等效折射率法 谐振波长 

分 类 号：TN252[电子电信—物理电子学]