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We investigate 1D aperiodic multilayer microstructures in order to achievenear total absorption in preselected wavelengths in a graphene monolayer. Ourstructures are designed by a genetic optimization algorithm coupled to atransfer matrix code. Coupled mode theory (CMT) analysis, in accordance withtransfer matrix method (TMM) results, indicates the existence of a criticalcoupling in a graphene monolayer for perfect absorptions. Our findings showthat the near-total-absorption peaks are highly tunable and can be controlledsimultaneously or independently in wide range of wavelengths in thenear-infrared and visible. Our proposed approach is metal free and does notrequire surface texturing or patterning, and can be applied for other twodimensional (2D) materials.

Selective Near Perfect Light Absorbtion by Graphene Monolayer Using Aperiodic Multilayer Microstructures