Abstract

A review of recent results and new data on the study of the optical response from semiconductor nanocrystals obtained using plasmon-enhanced optical spectroscopy, including surface enhanced Raman scattering (SERS) and plasmon-enhanced IR absorption, is presented. These methods are based on the amplification of the phonon response of semiconductor nanocrystals located in the field of localized surface plasmon resonance (LSPR) of metal nanostructures. Owing to the choice of a specific morphology of metal nanostructures, coincidence of the LSPR energy with the laser excitation energy and / or the energy of optical phonons in nanocrystals is provided. Resonant conditions ensure a significant increase in local electric fields and, as a result, a sharp increase in the Raman signal and IR absorption at the frequencies of surface optical phonons of nanocrystals. Amplification of the optical response makes it possible not only to detect monolayer coatings of nanocrystals, but also to study their crystal structure, phase and element compositions, and internal mechanical stresses. Application of Raman scattering (RS) in combination with atomic force microscopy with the use of a metallized probe has opened up new possibilities for analyzing the vibrational and electronic spectra of nanocrystals with nanometer spatial resolution

中文翻译：

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半导体纳米晶体的等离子体增强振动光谱

摘要

介绍了有关使用等离激元增强光谱学获得的半导体纳米晶体的光学响应研究的最新结果和新数据的综述，包括表面增强拉曼散射（SERS）和等离激元增强的IR吸收。这些方法基于位于金属纳米结构的局部表面等离子体激元共振（LSPR）领域的半导体纳米晶体的声子响应的放大。由于金属纳米结构的特定形态的选择，提供了LSPR能量与激光激发能量和/或纳米晶体中的光子的能量的重合。谐振条件确保了局部电场的显着增加，因此，在纳米晶体的表面光学声子频率处，拉曼信号和红外吸收急剧增加。光学响应的​​放大不仅使检测纳米晶体的单层涂层成为可能，而且使研究其晶体结构，相和元素组成以及内部机械应力成为可能。拉曼散射（RS）与原子力显微镜结合金属化探针的应用为分析具有纳米空间分辨率的纳米晶体的振动和电子光谱开辟了新的可能性