Near infrared six band polarization independent wide angle absorber based on metal cavity arrays filled with GaAs
Dear editor, Since the first microwave metamaterial perfect absorber (MPA) was reported by Landy et al. [1] the study of metamaterial perfect absorbers has attracted attention because of their broad application prospects. Owing to the strong resonant nature of metamaterials, MPAs generally have a single narrow absorption band, which considerably affects their practical applications, particularly in infrared frequency selective detection, imaging, and bolometric applications. To increase the number of absorption bands, there are currently two typical ways, namely, coplanar multiple substructures with different geometric dimensions in a unit cell [2,3] and vertically stacked multilayer metal/dielectric structures [4] However, these designs are limited to triple band and quadrupleband perfect absorption and five or more absorption bands are rarely involved. Therefore, the design of multiband (higher than five bands) infrared absorbers is still a challenge.
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