Optical absorption modulation and image display capabilities of all-dielectric metasurface featuring integrated graphene
Perfect absorption in monolayer two-dimensional(2D)materials is critical for the next generation of on-chip devices.However,absorption mechanisms based on surface plasmon polaritons(SPPs)and Fabry-Perot cavities(FPCs)are limited by tuning capability,low stability,and complex fabrication processes.Bound states in the continuum(BICs)are considered ideal platforms for enhancing light-matter interactions.In this context,we propose an all-dielectric metasurface that supports symmetry-protected bound states in the continuum(SP-BIC)in the near-infrared spectral region.By breaking the symmetry of the metasurface,it is transformed into the quasi-bound state in the continuum(qBIC)with exceptional quality factors(Q-factor),while monolayer graphene is introduced into the system to form a critically coupled absorption system.Remarkably,we achieved a modulation efficiency of 93.8％for light absorption by solely controlling the polarization angle of the incident wave without altering the structural parameters.Based on this graphene-metasurface ideal absorber,optical digital"0-1"switching and metasurface image display functionalities have been successfully achieved,and they hold promise to provide theoretical guidance for next-generation integrated optical components on chips.
bound states in the continuumgraphemeoptical absorption modulationimage display
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