Department of Applied Physics, Osaka University , 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan.
Chem Rev. 2017 May 10;117(9):6447-6466. doi: 10.1021/acs.chemrev.6b00821. Epub 2017 May 1.
This review discusses a relatively new technique for optical nanoimaging at visible wavelength, known as tip-enhanced Raman spectroscopy (TERS). This technique relies on the enhancement and spatial confinement of light in the close vicinity of the apex of a plasmonic nanotip. The plasmonic nanotip can be positioned on the sample and controlled by a suitable scanning probe microscopy, such as atomic force microscopy or scanning tunneling microscopy. By raster scanning the nanotip, one can obtain nanoimages with high spatial resolution. While enhancement helps measuring weak phonon modes from a tiny volume of the sample, confinement delivers extremely high spatial resolution in nanoimaging. We will discuss the technique of TERS in more detail with several applications and review the recent advances.
本文讨论了一种在可见波长下进行光学纳米成像的相对较新的技术，即尖端增强拉曼光谱（TERS）。该技术依赖于等离子体纳米尖端顶点附近光的增强和空间限制。等离子体纳米尖端可以通过适当的扫描探针显微镜（如原子力显微镜或扫描隧道显微镜）定位在样品上并进行控制。通过对纳米尖端进行光栅扫描，可以获得具有高空间分辨率的纳米图像。虽然增强有助于测量来自样品微小体积的弱声子模式，但限制在纳米成像中提供了极高的空间分辨率。我们将通过几个应用详细讨论 TERS 技术，并回顾最近的进展。
