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

Graphene-based absorber exploiting guided mode resonances in one-dimensional gratings M. Grande, M. A. Vincenti, T. Stomeo, G. V. Bianco, D. de Ceglia, N. Aközbek, V. Petruzzelli, G. Bruno, M. De Vittorio, M. Scalora, and A. D’Orazio  »View Author Affiliations

Optics Express, Vol. 22, Issue 25, pp. 31511-31519 (2014)
http://dx.doi.org/10.1364/OE.22.031511

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http://www.opticsinfobase.org/oe/abstract.cfm?uri=oe-22-25-31511

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 (≈2.3%). Experimental results confirm this behavior showing CVD graphene absorbance peaks up to about 40% over narrow bands of a few nanometers. The simple and flexible design points to a way to realize innovative, scalable and easy-to-fabricate graphene-based optical absorbers.

© 2014 Optical Society of America