Etchant-based design of gold tip apexes for plasmon-enhanced Raman spectromicroscopy

Sergey Kharintsev, Alexander Alekseev, Joachim Loos

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

In this paper, we gain insight into the design and optimization of plasmonic (metallic) tips prepared with dc-pulsed voltage electrochemical etching gold wires, provided that, a duty cycle is self-tuned. Physically, it means that etching electrolyte attacks the gold wire equally for all pulse lengths, regardless of its surface shape. Etchant effect on the reproducibility of a curvature radius of the tip apex is demonstrated. It means that the gold conical tips can be designed chemically with a choice of proper etchant electrolyte. It is suggested to use a microtomed binary polymer blend consisting of polyamide and low density polyethylene, as a calibration grating, for optimizing and standardizing tip-enhanced Raman scattering performance.

Original languageEnglish
Pages (from-to)139-143
Number of pages5
JournalSpectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
Volume171
DOIs
Publication statusPublished - Jan 15 2017

Keywords

  • Calibration grating
  • Electrochemical etching
  • Enhanced optical spectroscopy
  • Etchant effect
  • Gold tip
  • Optical antenna
  • Optical near-field
  • Polyethelene
  • Polyimide
  • Surface plasmon
  • Tip-enhanced Raman scattering

ASJC Scopus subject areas

  • Analytical Chemistry
  • Atomic and Molecular Physics, and Optics
  • Instrumentation
  • Spectroscopy

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