1 重庆大学光电工程学院光电技术及系统教育部重点实验室，重庆 400044
2 中国科学院重庆绿色智能技术研究院微纳制造与系统集成研究中心，重庆 400714
表面增强红外吸收光谱技术能够将红外光波高度局域在探测分子周围，极大增强光波与分子的相互作用，为实现微弱分子红外振动光谱信号的高灵敏探测提供了新思路。其中，二维材料极化激元由于具有高度局域化光场和低固有损耗等独特性质，为表面增强红外光谱提供了一种有效的方案。本文综述了二维材料极化激元增强红外光谱技术的研究进展：首先从不同材料体系出发介绍极化激元基本特性，论述极化激元与分子模式耦合机理；在此基础上总结二维材料极化激元增强红外光谱技术的几个重要研究方向，主要包括等离激元增强红外光谱技术、声子极化激元增强红外光谱技术和近场红外光谱增强技术；最后展望极化激元增强红外光谱技术未来可能的发展方向。
表面增强光谱 二维材料 等离激元 声子极化激元 红外光谱 激光与光电子学进展
2024, 61(3): 0330001
Author Affiliations
Abstract
1 Key Laboratory of Optoelectronic Technology & Systems, Ministry of Education of China, Chongqing University, Chongqing 400044, China
2 College of Optoelectronic Engineering, Chongqing University, Chongqing 400044, China
3 Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 401122, China
4 Chongqing Engineering Research Center of Graphene Film Manufacturing, Chongqing 401329, China
We propose a reflection-type infrared biosensor by exploiting localized surface plasmons in graphene ribbon arrays. By enhancing the coupling between the incident light and the resonant system, an asymmetric Fabry–Perot cavity formed by the ribbons and reflective layer is employed to reshape the reflection spectra. Simulation results demonstrate that the reflection spectra can be modified to improve the figure of merit (FOM) significantly by adjusting the electron relaxation time of graphene, the length of the Fabry–Perot cavity, and the Fermi energy level. The FOM of such a biosensor can achieve a high value of up to 36/refractive index unit (36/RIU), which is ～4 times larger than that of the traditional transmission-type one. Our study offers a feasible approach to develop biosensing devices based on graphene plasmonics with high precision.
280.1415 Biological sensing and sensors 240.6680 Surface plasmons 160.4236 Nanomaterials 260.3060 Infrared Chinese Optics Letters
2015, 13(8): 082801
