Open AccessTip-enhanced Raman spectroscopy based on plasmonic lens excitation and experimental detection
Author(s) -
Mingqian Zhang,
Jia Wang,
Qi Tian
Publication year - 2013
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.21.009414
Subject(s) - optics , raman scattering , plasmon , raman spectroscopy , finite difference time domain method , materials science , excitation , lens (geology) , electric field , spectroscopy , near field scanning optical microscope , optical microscope , physics , scanning electron microscope , quantum mechanics
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.