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We theoretically and experimentally investigate the optical absorptionproperties of heterostructures composed of graphene films and truncatedphotonic crystals (PCs) in the visible range. The experimental results showthat the absorption of the heterostructure is enhanced greatly in the wholeforbidden gap of PCs compared with that of graphene alone. The absorption isenhanced over a wide angle of incidence for both transverse electric (TE) andtransverse magnetic (TM) polarizations. The enhanced absorption band broadensfor TE polarization but narrows for TM polarization as the incident angleincreases. In the forbidden gap of the PCs, the maximum absorptance of theheterostructures is nearly four times of that of bare graphene films forarbitrary incident angles and polarizations. The optical experiments are inexcellent agreement with the theoretical results.

Enhanced absorption in heterostructures with graphene and truncated photonic crystals