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Proceedings Paper

Ultra-broadband plasmonic super absorbers for universal surface enhanced Raman spectroscopy substrate (Presentation Recording)
Author(s): Nan Zhang; Kai Liu; Haomin Song; Xie Zeng; Dengxin Ji; Qiaoqiang Gan
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Paper Abstract

Although Raman spectroscopy has been commercialized, low-cost and large-area surface enhanced Raman spectroscopy (SERS) substrates with localized enhanced field are heavily required. However, currently dominant manufacturing techniques are expensive and complicated for large-area fabrication. Furthermore, most SERS substrates can only be used for individual excitation wavelengths. In this work, we will report an ultra-broadband super absorbing metasurface to enhance SERS signals in a broadband region (i.e. from 450 nm to 1000 nm). The design consisting of an Ag ground plate, a SiO2 spacer, and a layer of Ag nanoparticles was fabricated using simple film deposition and thermal annealing techniques. A broadband absorption over 80% from 414 nm to 956 nm was obtained, resulting in localized field enhancement between adjacent nanoparticles. We employed this metasurface to test its broadband SERS signal by adsorbing 1,2-Bis(4-pyridyl)-ethylene (BPE) molecules on top of it. We employed 5 laser lines (i.e., 514, 532, 633, 671 and 785 nm) to excite the sample and observed fingerprint signature of BPE molecules under all 5 excitation wavelengths with the average enhancement factor up to 5.3×107. Therefore, the designed SERS substrate can work for almost “all” available excitation wavelengths over a broadband, which is particularly useful for sensing a broad spectrum of chemicals on the same chip.

Paper Details

Date Published: 5 October 2015
PDF: 1 pages
Proc. SPIE 9550, Biosensing and Nanomedicine VIII, 95500S (5 October 2015); doi: 10.1117/12.2187667
Show Author Affiliations
Nan Zhang, Univ. at Buffalo (United States)
Kai Liu, Univ. at Buffalo (United States)
Haomin Song, Univ. at Buffalo (United States)
Xie Zeng, Univ. at Buffalo (United States)
Dengxin Ji, Univ. at Buffalo (United States)
Qiaoqiang Gan, Univ. at Buffalo (United States)

Published in SPIE Proceedings Vol. 9550:
Biosensing and Nanomedicine VIII
Hooman Mohseni; Massoud H. Agahi; Manijeh Razeghi, Editor(s)

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