Tunable Anisotropic Absorber Based on Multilayer Graphene-Black Phosphorus Structure
Based on impedance matching theory and the multilayer local surface plasmon resonance coupling effect,we designed a multilayer graphene-black phosphorus tunable anisotropic absorber.We used the finite-difference time-domain method to simulate and analyze the results.Under TE polarization,we achieved an average broadband absorption of 94%in the wavelength range of 20.8~45.34 μm.Under TM polarization,we achieved an average broadband absorption of 96.3%in the wavelength range of 16.6~44.6 μm,thus indicating a certain degree of anisotropic absorption.In addition,the absorption bandwidth can be altered by adjusting the width of the graphene-black phosphorus block.Simultaneously,dynamically adjusting the Fermi level of graphene or the electron-doping concentration of black phosphorus can alter the absorption bandwidth and average absorption rate.The results of this study are theoretically significant in the fields of dynamic tunable infrared-energy acquisition,polarization-selective absorption,and infrared camouflage.