基于布洛赫理论的光子晶体表面波形成及传感机理  

Formation and Sensing Mechanism of Photonic Crystal Surface Wave Based on Bloch Theory

作　　者：陈颖[1] 范卉青 卢波[1] 曹会莹 朱奇光[2] 陈卫东[2] 

机构地区：[1]燕山大学电气工程学院测试计量技术及仪器河北省重点实验室,河北秦皇岛066004 [2]燕山大学信息科学与工程学院河北省特种光纤与光纤传感器重点实验室,河北秦皇岛066004

出　　处：《中国激光》2016年第1期239-244,共6页Chinese Journal of Lasers

基　　金：国家自然科学基金(61201112;61172044;61475133);河北省自然科学基金(F2013203250;F2012203169);河北省普通高校学校青年拔尖人才计划项目(BJ2014056);燕山大学青年教师自主研究计划项目(14LG013)

摘　　要：结合布洛赫理论和麦克斯韦方程组,针对一维光子晶体表面缺陷态结构形成的布洛赫表面波进行理论分析,并研究了布洛赫表面波的局域特性和入射电磁波波长与角度对布洛赫表面波的影响。在此基础上,对一维光子晶体表面缺陷态结构的传感特性进行分析,当TE偏振分量以一定角度入射到光子晶体中时,在待测溶液形成的缺陷层中发生谐振,电磁场被局域增强,与待测溶液分子充分作用,其形成的布洛赫表面波对待测溶液折射率变化具有高度的敏感性。数值模拟结果表明,其Q值可达2620.29,灵敏度S为62°RIU-1,因此布洛赫表面波在一维光子晶体结构中具有很好的传感特性,可为折射率传感器的设计和应用提供理论参考。Combining the Bloch theory and Maxwell equations, the Bloch surface wave forming on the surface defect of one-dimensional photonic crystal is analyzed theoretically. The local characteristics of Bloch surface wave and the influences of incident angles and incident wavelengths on the Bloch surface are discussed. On this basis, the sensing performance of the surface defect photonic crystal structure is studied. When the incident TE polarization component travels through the photonic crystal at a certain angle, the surface wave resonance occurs in the defect layer forming by the detected solution, and the electromagnetic field is located and enhanced. The Bloch surface wave has a high sensitivity with the change of the refractive index of the solutions. The simulation results show that the Q value can up to about 2620.29, and the sensitivity S is about 62°RIU-1. Therefore, the Bloch surface wave has good sensing performance in the one-dimensional photonic crystal structure. It can provide certain theoretical references for the design and application of refractive index sensors.

关 键 词：表面光学 表面波 布洛赫表面波 光子晶体 表面缺陷态 折射率传感 

分 类 号：O436[机械工程—光学工程]