基于等离激元法布里-珀罗腔折射率测量的实验设计

doi:10.14139/j.cnki.cn22-1228.2024.01.005

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摘要

利用自下而上的纳米加工工艺，制备了一种由银纳米线对和金膜构成的等离激元法布里珀罗(F-P)腔。暗场散射光谱和数值模拟表明，金膜表面传输的表面等离激元经银纳米线对的多次反射下，会在腔内形成驻波现象，并在散射光谱中呈现出多光束干涉调制的光谱线型。利用这一原理设计一个折射率测量实验，通过测量不同浓度甘油溶液的折射率，得到了 F-P 腔共振波长随溶液折射率增大的线性红移规律。进而通过调谐 F-P 腔的长度，得到该 F-P 腔最高的探测灵敏度为 555 nm/ＲIU。

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	肖发俊
	张慧婷
	李晨阳
	刁航
	杨浩冬
	魏泽浩
	赵建林

关键词: 表面等离激元法布里珀罗效应折射率测量等离激元腔

Abstract:

A plasmon Fabry-Pérot (F-P)cavity，composed of the silver nanowire pairs and gold film，is prepared using the bottom-up nanofabrication process． Combing the dark-field scattering spectroscopy and numerical simulation，it is revealed that the surface plasmon polariton propagating on the metal surface is multi-reflected by the nanowires，rendering a standing wave in the cavity and a multi-beam interference modulated spectral line-shape．Furthermore，the refractive indices of glycerol solutions with different concentrations are measured using the F-P cavity，suggesting a linear redshift law of the cavity resonant wavelength with increasing of the refractive index of the solution．Finally，by tuning the length of the F-P cavity，the highest detection sensitivity of 555 nm/ＲIU is derived．

Key words: surface plasmons Fabry-Pérot effect refractive index measurement plasmonic cavity

出版日期: 2024-02-25 发布日期: 2024-02-25 整期出版日期: 2024-02-25

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引用本文:

肖发俊, 张慧婷, 李晨阳, 刁航, 杨浩冬, 魏泽浩, 赵建林. 基于等离激元法布里-珀罗腔折射率测量的实验设计 [J]. 大学物理实验, 2024, 37(1): 22-26.
XIAO Fajun, ZHANG Huiting, LI Chenyang, DIAO Hang, YANG Haodong, WEI Zehao, ZHAO Jianlin. Experimental Instructional Design of Ｒefractive Index Measurement Using Plasmonic Fabry-Pérot Cavity . Physical Experiment of College, 2024, 37(1): 22-26.

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http://dawushiyan.jlict.edu.cn/CN/10.14139/j.cnki.cn22-1228.2024.01.005 或 http://dawushiyan.jlict.edu.cn/CN/Y2024/V37/I1/22

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