Abstract
Tip-enhanced Raman spectroscopy (TERS) is recently becoming indispensable as a nano-imaging technique for analyzing advanced nano-devices and nano-materials because it allows strong enhancement of weak Raman signals from the nanometric volume of a sample [1]. However, consistent enhancement in TERS is still an issue, and scientists have been struggling to fabricate good tips for a reliable, strong and reproducible enhancement [2]. The design of the metallic nanotip, which acts as an optical antenna for enhancing Raman scattering, is one of the most important parameter to control the enhancement. Many scientists have realized this fact and have discussed about the need for investigating suitable tip structures for improved control on the enhancement in TERS, but unfortunately no one has yet reported a systematic study on this very important aspect of TERS.
© 2016 Japan Society of Applied Physics, Optical Society of America
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