期刊
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
卷 171, 期 -, 页码 139-143出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2016.07.048
关键词
Optical antenna; Gold tip; Tip-enhanced Raman scattering; Optical near-field; Surface plasmon; Electrochemical etching; Polyimide; Polyethelene; Enhanced optical spectroscopy; Calibration grating; Etchant effect
类别
资金
- Russian Foundation for Basic Research [15-42-02339]
- Ministry of Education and Science of Kazakhstan program NU-LBNL [0115PK03029]
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. (C) 2016 Elsevier B.V. All rights reserved.
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