用于表面增强拉曼光谱的混合二聚体双共振底物。

Mixed dimer double-resonance substrates for surface-enhanced Raman spectroscopy.

机构信息

School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States.

出版信息

ACS Nano. 2011 Jan 25;5(1):307-14. doi: 10.1021/nn102726j. Epub 2010 Dec 16.

Abstract

Surface-enhanced Raman spectroscopy is performed on pairs of gold nanoparticles, for which the nanoparticles in each pair have different shapes. The dimers therefore exhibit two plasmon resonances. These structures, termed mixed dimer double-resonance substrates, enable strong field enhancement at pump and Stokes frequencies in surface-enhanced Raman spectroscopy. The extinction spectra of mixed dimers are measured and simulated to identify their plasmon resonances. The experimentally determined enhancement factors of double-resonance structures are compared to those of single-resonance substrates.

摘要

表面增强拉曼光谱是在一对金纳米粒子上进行的，其中每对纳米粒子具有不同的形状。因此，二聚体表现出两个等离子体激元共振。这些结构被称为混合二聚体双共振基底，能够在表面增强拉曼光谱中在泵浦和斯托克斯频率处实现强场增强。测量并模拟混合二聚体的消光谱以确定其等离子体共振。将双共振结构的实验确定的增强因子与单共振基底的增强因子进行比较。