 | Graphene-based absorber exploiting guided mode resonances in one-dimensional gratings |
Optics Express, Vol. 22, Issue 25, pp. 31511-31519 (2014)
http://dx.doi.org/10.1364/OE.22.031511
http://dx.doi.org/10.1364/OE.22.031511
http://www.opticsinfobase.org/oe/abstract.cfm?uri=oe-22-25-31511
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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
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