Zhang Mingqian, Wang Jia, Tian Qian
State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instruments, Tsinghua University, Beijing 100084, China.
Opt Express. 2013 Apr 22;21(8):9414-21. doi: 10.1364/OE.21.009414.
A tip-enhanced Raman spectroscopy (TERS) based on plasmonic lens (PL) excitation is proposed in this work. A PL expected to realize a strong longitudinal electric field focus is designed. The focusing performance of the PL is calculated via finite-difference time-domain (FDTD) simulation and experimentally detected by a scattering-type scanning near-field optical microscope. The PL is introduced to a TERS system as a focusing device. Experimental results with carbon nanotube samples indicate that the Raman scatting signal is significantly enhanced. It proves experimentally that the combination of a PL focused excitation field with a metallic tip in a TERS system is a promising method.
本文提出了一种基于表面等离子体透镜（PL）激发的针尖增强拉曼光谱（TERS）。设计了一种有望实现强纵向电场聚焦的PL。通过时域有限差分（FDTD）模拟计算了PL的聚焦性能，并利用散射型扫描近场光学显微镜进行了实验检测。将PL作为聚焦装置引入TERS系统。对碳纳米管样品的实验结果表明，拉曼散射信号得到了显著增强。实验证明，在TERS系统中将PL聚焦激发场与金属针尖相结合是一种很有前景的方法。
