Experimental observation of plasmons in a graphene monolayer resting on a two-dimensional subwavelength silicon grating

TL;DR

This paper reports the experimental observation of graphene plasmon polaritons excited via a silicon grating, demonstrating a promising platform for graphene-based opto-electronic devices.

Contribution

It introduces a novel experimental setup using a subwavelength silicon grating to excite and observe graphene plasmons, supported by simulations and theoretical analysis.

Findings

Successful excitation of graphene-plasmon polaritons confirmed by transmission spectra

Fabrication of a silicon grating using nanosphere lithography

Theoretical and numerical support for plasmon band diagrams

Abstract

We experimentally demonstrate graphene-plasmon polariton excitation in a continuous graphene monolayer resting on a two-dimensional subwavelength silicon grating. The subwavelength silicon grating is fabricated by a nanosphere lithography technique with a self-assembled nanosphere array as a template. Measured transmission spectra illustrate the excitation of graphene-plasmon polaritons, which is further supported by numerical simulations and theoretical prediction of plasmonband diagrams. Our grating-assisted coupling to graphene-plasmon polaritons forms an important platform for graphene-based opto-electronics applications.