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

G. Veronis; A. Mahigir; T.-W. Chang; A. Behnam; G. L. Liu; M. R. Gartia

doi:10.1117/12.2529621

5 September 2019 Nanostructures for enhancing the SERS signal of a graphene monolayer in water and visible light absorption in a graphene monolayer

G. Veronis, A. Mahigir, T.-W. Chang, A. Behnam, G. L. Liu, M. R. Gartia

Author Affiliations +

Proceedings Volume 11081, Active Photonic Platforms XI; 110810V (2019) https://doi.org/10.1117/12.2529621
Event: SPIE Nanoscience + Engineering, 2019, San Diego, California, United States

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.

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Citation Download Citation

G. Veronis, A. Mahigir, T.-W. Chang, A. Behnam, G. L. Liu, and M. R. Gartia "Nanostructures for enhancing the SERS signal of a graphene monolayer in water and visible light absorption in a graphene monolayer", Proc. SPIE 11081, Active Photonic Platforms XI, 110810V (5 September 2019); https://doi.org/10.1117/12.2529621

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