Tunable environment-enhanced mid-infrared absorber based on voltage modulation

In this paper, we propose a design of mid-infrared Metamaterial Absorber (MIMA). The MIMA is composed thin metamaterial nanostructure period array cross-circular structure Ti with continuum graphene layer and bottom film Al substrate, the middle dielectric stack Si 3 N xmlns:xlink="http://www.w3.org/1999/xlink">4 SiO xmlns:xlink="http://www.w3.org/1999/xlink">2 . coupling surface plasmon resonance (SPR) graphene, metal layers intrinsic absorption material enhance broadband absorption. maintains 97% average in 3.8∼6.5 μm background refractive index 1.33. 80% within an incidence angle 50 it polarization insensitive. Dynamic tuning bandwidth by changing Fermi energy level applying voltage to surface. can broaden complex environments (water, ice, alcohol). proposed research shows excellent applications thermal emitter photocatalysis, infrared camouflage environment .