含有银纳米膜的棱镜中光束古斯-汉欣位移效应研究  

The ■nchen shift from the prisms structure coated with silver nanofilm

作　　者：王云飞 周晓迪 陈平[1] 肖东[2] 韩建[2] WANG Yun-fei;ZHOU Xiao-di;CHEN Ping;XIAO Dong;HAN Jian(Institute of Modem Optics, College of Electronic Information and Optical Engineering, Nankai University,Tianjin 300350,China;Nanjing Institute of Astronomical Optics & Technology , National Astronomical Observatories,Nanjing 210042,China)

机构地区：[1]南开大学电子信息与光学工程学院现代光学研究所,天津300350 [2]中国科学院国家天文台南京天文光学技术研究所,南京210042

出　　处：《光电子．激光》2019年第6期659-664,共6页Journal of Optoelectronics·Laser

基　　金：天津市科技支撑重点项目(15ZCZDGX00250);发光学及应用国家重点实验室开放基金资助项目对本研究工作的支持

摘　　要：古斯-汉欣位移是一种灵敏度极高的折射率测量办法,在温度、压力传感等方面有巨大的应用潜力,但测量精度要求较高。为解决测量的困难和提高古斯-汉兴测量精度,本文设计了一种棱镜-银纳米膜界面层,搭建了一套可测量多偏振态多角度古斯-汉兴位移的测量装置,以此测量了棱镜-空气和棱镜-银纳米膜不同界面的光束的古斯-汉欣位移,并对其物理机制进行了探讨。实验结果显示棱镜-空气界面的古斯-汉欣位移平均值是2.7 μm,棱镜-银纳米膜界面的古斯-汉欣位移平均值是 27.7 μm,比棱镜-空气界面的位移增大了约10倍。使用COMSOL multiphysics软件模拟了棱镜-银纳米膜以及棱镜-空气界面的电场分布,对比棱镜-空气的情况,表明在消逝场作用下,银纳米颗粒表面形成了较强光场分布,光场方向沿入射光电场振动方向;银颗粒表面光场和消逝场的叠加使得消逝场增强,从而导致棱镜-银纳米膜界面的古斯-汉欣位移增大。本工作为提高基于古斯-汉欣位移效应的生物传感器的灵敏度提供了一个可供选择的手段。TheGoos-Hnchenshiftis a highly sensitive refractive indexmeasuremen t method,which has great application potential in temperature and pressure sensing,but has hig h requirements for measurement accuracy.In order to solve the measurement difficulties and improve the measurement accuracy of Goos-Hnchen,Inthis paper,wedesigna prism-silver nanof ilminterface layer and builda measuring device that can measure multi-polarization state and multi-angle Goo s-Hnchenshift.The Goos-Hnchenshift of the beam at different interfaces of prism-air and prism-silver nanofilm was measured and its physical mechanism was discussed.The experimental results show that the average Goos-Hnchen shift at the prism-air and the silver nanofilm interfa ces are 2.7μm and 27.7μm, respectively.The Goos-Hnchen shift at the silver nanofilm interface isenhancedmore than 10times compared with that atthe prism-air interface.The electric field distribution a t the prism-silver nanofilminterfaceandprism-airinterface was simulated using C OMSOL multiphysics software.Theoretical analysis demonstratesthat the strong local field generated by the silver nanopar ticles enhances the evanescent field,which contributes tothe improvementof the Goos-Hnc hen shift at the prism-silver nanofilm interface.The research work provides analternativestrategyfor improving the sensitivityof thosebiosensorsbased on the Goos-Hnchenshift eff ect.

关 键 词：古斯-汉欣位移 消逝场 表面光场 银纳米膜 棱镜 

分 类 号：O436[机械工程—光学工程]