Ultra-broadband plasmonic super absorbers for universal surface enhanced Raman spectroscopy substrate (Presentation Recording)

Nan Zhang; Kai Liu; Haomin Song; Xie Zeng; Dengxin Ji; Qiaoqiang Gan

doi:10.1117/12.2187667

5 October 2015 Ultra-broadband plasmonic super absorbers for universal surface enhanced Raman spectroscopy substrate (Presentation Recording)

Nan Zhang, Kai Liu, Haomin Song, Xie Zeng, Dengxin Ji, Qiaoqiang Gan

Author Affiliations +

Proceedings Volume 9550, Biosensing and Nanomedicine VIII; 95500S (2015) https://doi.org/10.1117/12.2187667
Event: SPIE Nanoscience + Engineering, 2015, San Diego, California, United States

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.

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Citation Download Citation

Nan Zhang, Kai Liu, Haomin Song, Xie Zeng, Dengxin Ji, and Qiaoqiang Gan "Ultra-broadband plasmonic super absorbers for universal surface enhanced Raman spectroscopy substrate (Presentation Recording)", Proc. SPIE 9550, Biosensing and Nanomedicine VIII, 95500S (5 October 2015); https://doi.org/10.1117/12.2187667

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KEYWORDS

Surface enhanced Raman spectroscopy

Fabrication

Molecules

Nanoparticles

Plasmonics

Silver

Manufacturing

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