Study of the interaction between light and nanoantennas in Tip-Enhanced Raman Spectroscopy

2019 4th International Symposium on Instrumentation Systems, Circuits and Transducers (INSCIT) Pub Date : 2019-08-01 DOI:10.1109/INSCIT.2019.8868513

Hudson Miranda, Cassiano Rabelo, T. Vasconcelos, L. G. Cançado, A. Jorio

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引用次数: 2

Abstract

The interaction of light with nanometric metallic structures - nanoantennas - is of particular interest for material analysis techniques such as Tip Enhanced Near-Field Optical Microscopy (TENOM) and, specifically, Tip Enhanced Raman Spectroscopy (TERS). In these scenarios, the nanoantenna's response to an excitation provided by a tightly focused laser beam is essential in order to qualify the system's lateral resolution and signal-to-noise ratio. This work proposes an apparatus that enables the study of the nanoantenna's response in the focal region of light provided by a high numerical aperture optical system. The apparatus is validated by measuring the Raman scattering intensity distribution around the focal region under different conditions, enabling the precise characterization of the electromagnetic field distribution around the focal region, providing informations regarding alignment tolerance, optical signal enhancement and optical system's Point Spread Function (PSF).

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尖端增强拉曼光谱中光与纳米天线相互作用的研究

光与纳米金属结构(纳米天线)的相互作用对材料分析技术(如尖端增强近场光学显微镜(TENOM)，特别是尖端增强拉曼光谱(TERS))特别感兴趣。在这些情况下，纳米天线对紧密聚焦激光束激发的响应对于确定系统的横向分辨率和信噪比至关重要。这项工作提出了一种装置，可以研究纳米天线在高数值孔径光学系统提供的光的焦点区域的响应。通过测量不同条件下焦点区域周围的拉曼散射强度分布，对该装置进行了验证，能够精确表征焦点区域周围的电磁场分布，提供有关对准公差、光信号增强和光学系统点扩展函数(PSF)的信息。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2019 4th International Symposium on Instrumentation Systems, Circuits and Transducers (INSCIT)

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