基于振荡型金属光波导厚度增强的拉曼散射  

Enhanced Raman Scattering Based on Thickness of Oscillating Metallic Optical Waveguide

作　　者：陆炎 石霄雯 邓小燕 陶雨濛 陈鸿莉 方靖淮[3] 仲崇贵[3] Lu Yan;Shi Xiaowen;Deng Xiaoyan;Tao Yumeng;Chen Hongli;Fang Jinghuai;Zhong Chonggui(School of Transportation Engineering,Jiangsu Shipping College,Nantong,Jiangsu 226010,China;School of Rail Transportation,Nanjing Vocational Institute of Transport Technology,Nanjing,Jiangsu 211188,China;School of Science,Nantong University,Nantong,Jiangsu 226019,China)

机构地区：[1]江苏航运职业技术学院交通工程学院,江苏南通226010 [2]南京交通职业技术学院轨道交通学院,江苏南京211188 [3]南通大学理学院,江苏南通226019

出　　处：《激光与光电子学进展》2021年第11期336-341,共6页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(11904184);江苏省大学生创新训练计划(202012703006Y);南通航运职业技术学院科技计划(HYKY/2019B03)。

摘　　要：采用具有毫米尺度的振荡型金属光波导结构对酞菁铜的拉曼散射进行增强。不同于传统的表面增强拉曼光谱(SERS)技术,通过设计复杂的贵金属纳米结构来创造热点的策略,本文通过增加金属光波导上、下表面金属包覆层之间的距离,即增加导波层的厚度能够耦合大量的光波能量进入导波层中,从而增强光与物质间的相互作用。尽管增加导波层的厚度存在单个模式场强下降的风险,但优势也很明显。首先,高模式密度有利于入射光能量与导波层的耦合;其次,激发光可以近垂直入射到波导表面,简化光学设置;最后,厚波导结构的偏振无关特性对拉曼增强具有贡献。In this study, the Raman scattering of copper phthalocyanine is enhanced by adopting a millimeter-scale oscillating metallic optical waveguide structure. Different from the traditional surface-enhanced Raman spectroscopy(SERS) technology that creates hot spots by designing complex nanostructures of precious metals, we increase the distance between the upper and lower surface metal cladding layers of the metal optical waveguide, which can increase the thickness of the guided wave layer coupling of light energy into guided wave layer, thereby enhancing the interaction between light and matter. Although increasing the thickness of the guiding layer has the risk of a singlemode field strength drop, the advantages are obvious. First, the high mode density facilitated the coupling of incident light energy with the waveguide layer. Second, the excitation light could be incident nearly perpendicular to the waveguide surface, thereby simplifying the optical setup. Finally, the polarization-independent characteristics of the thick waveguide structure contributed to the Raman enhancement.

关 键 词：光学器件 平板光波导 拉曼光谱 光谱调制 

分 类 号：O433[机械工程—光学工程]