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Proceedings Paper

Nanostructures for enhancing the SERS signal of a graphene monolayer in water and visible light absorption in a graphene monolayer
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Paper Abstract

We numerically design and experimentally test a SERS-active substrate for enhancing the SERS signal of a monolayer of graphene in water. The monolayer is placed on top of an array of silver-covered nanoholes in a polymer and is covered with water. Here we report a large enhancement of up to 200000 in the SERS signal of the graphene monolayer on the patterned plasmonic nanostructure for a 532 nm excitation laser wavelength. Our numerical calculations of both the excitation field and the emission rate enhancements support the experimental results. We also propose a highly compact structure for near total light absorption in a monolayer of graphene in the visible. The structure consists of a grating slab covered with the graphene monolayer. The grating slab is separated from a metallic back reflector by a dielectric spacer. The proposed structure could find applications in the design of efficient nanoscale visible-light photodetectors and modulators.

Paper Details

Date Published: 5 September 2019
PDF: 8 pages
Proc. SPIE 11081, Active Photonic Platforms XI, 110810V (5 September 2019); doi: 10.1117/12.2529621
Show Author Affiliations
G. Veronis, Louisiana State Univ. (United States)
A. Mahigir, Louisiana State Univ. (United States)
T.-W. Chang, Intel Corp. (United States)
Univ. of Illinois, Urbana-Champagne (United States)
A. Behnam, Intel Corp. (United States)
Univ. of Illinois, Urbana-Champagne (United States)
G. L. Liu, Intel Corp. (United States)
M. R. Gartia, Louisiana State Univ. (United States)

Published in SPIE Proceedings Vol. 11081:
Active Photonic Platforms XI
Ganapathi S. Subramania; Stavroula Foteinopoulou, Editor(s)

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