Graphene-based absorber exploiting guided mode resonances in   one-dimensional gratings
  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. 
M. Grande, M. A. Vincenti, T. Stomeo, G. V. Bianco, D. de Ceglia, N.   Akozbek, V. Petruzzelli, G. Bruno, M. De Vittorio, M....
physics.optics