基于纵向间隙等离激元共振增强表面拉曼散射的研究综述

Review on Enhanced Surface Raman Scattering Based on Longitudinal Gap Plasmon Resonance

表面增强拉曼散射(SERS)技术具有超高灵敏度、低检测极限、无损伤、快速高效、可提供分子指纹信息等优点,被广泛应用于生物医学、环境监测、食品安全、公共安全等领域。SERS增强与其基底的性能密切相关,制备高灵敏度、均匀稳定、重复性好、大面积的微纳结构基底是SERS技术的重要基础。本文主要介绍基于纵向间隙等离激元共振增强表面拉曼散射的研究进展。根据间隔层的不同,重点阐述了不掺探针分子的纯介质间隔层、掺探针分子的薄膜间隔层以及空气间隔层三种纵向耦合金属微纳结构的制备,并展示其作为SERS基底的各项性能参数。为满足实际检测需求,未来SERS基底需在抗氧化、可循环利用、可折叠弯曲等方面取得进一步的突破。

Surface-enhanced Raman scattering(SERS)technology has the advantages of ultra-high sensitivity,low detection limit,no damage,fast and efficient,and providing molecular fingerprint information,which is widely used in biomedicine,environment monitoring,food safety,public safety and other fields.SERS enhancement is closely related to the performance of SERS substrates,where the preparation of ultrasensitive,uniform,stable,repeatable,and large-area micro-nanostructured substrates is a significant basis for SERS technology.This paper mainly reviews the research on enhanced surface Raman scattering based on longitudinal gap plasmon resonance.According to the difference of the spacer layer,such as the pure dielectric spacer layer without probe molecules,the thin film spacer layer with probe molecules and the air spacer layer,these three kinds of longitudinally coupled metal micro-nano structures are chiefly described and shown the fabrication procedure,and their performance parameters as SERS substrates are demonstrated.In order to meet the reality detection needs,SERS substrates need to make further breakthroughs in oxidation resistance,recyclability,fold and curving in the future.