Plasmonic optical antenna design for performing tip-enhanced Raman spectroscopy and microscopy

S.S. Kharintsev, G.G. Hoffmann, A.I. Fishman, M.K. Salakhov

Research output: Contribution to journalArticleAcademicpeer-review

32 Citations (Scopus)
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Abstract

This paper highlights optical plasmonic antennas designed with dc-pulsed low-voltage electrochemical etching of a gold wire for implementing tip-enhanced Raman scattering (TERS) measurements. We demonstrate a versatile electrochemical system that allows one to engineer TERS-active metallic gold tips with diverse shapes and sizes in a highly reproducible fashion. The underlying etching mechanism at a voltage-driven meniscus around a gold wire immersed into an electrolyte is discussed in detail. We show that the developed method is suitable to produce not only the simplest geometries such as cones and spheroids, but more complex designs. Attempts have been made to design plasmonic tapered antennas with quasi-uniformly spaced nano-sized bumps on the mesoscopic zone for the extra surface plasmon-light coupling. The capability of the patterned antenna to enhance and localize optical fields is demonstrated with near-field Raman microscopy and spectroscopy of single-walled carbon nanotubes bundles.
Original languageEnglish
Article number145501
Pages (from-to)1-9
Number of pages9
JournalJournal of Physics D: Applied Physics
Volume46
Issue number14
DOIs
Publication statusPublished - 2013

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