Graphene-based absorber exploiting guided mode resonances in one-dimensional gratings

Abstract

A one-dimensional dielectric grating, based on a simple geometry, is proposed and investigated to enhance light absorption in a monolayer graphene exploiting guided mode resonances. Numerical findings reveal that the optimized configuration is able to absorb up to 60% of the impinging light at normal incidence for both TE and TM polarizations resulting in a theoretical enhancement factor of about 26 with respect to the monolayer graphene absorption (about 2.3%). Experimental results confirm this behaviour showing CVD graphene absorbance peaks up to about 40% over narrow bands of few nanometers. The simple and flexible design paves the way for the realization of innovative, scalable and easy-to-fabricate graphene-based optical absorbers.

References in corpus (6)

• Electric Field Effect in Atomically Thin Carbon Films
• Universal Dynamic Conductivity and Quantized Visible Opacity of Suspended Graphene
• Dyadic Green's Functions and Guided Surface Waves for a Surface Conductivity Model of Graphene
• Graphene photodetectors for high-speed optical communications
• Third harmonic generation in graphene and few-layer graphite films
• Experimental observation of plasmons in a graphene monolayer resting on a two-dimensional subwavelength silicon grating