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We theoretically consider infrared-driven hyperbolic metamaterials able tospatially filtering terahertz radiation. The metamaterial is a slab made ofalternating semiconductor and dielectric layers whose homogenized uniaxialresponse, at terahertz frequencies, shows principal permittivities of differentsigns. The gap provided by metamaterial hyperbolic dispersion allows the slabto stop spatial frequencies within a bandwidth tunable by changing the infraredradiation intensity. We numerically prove the device functionality by resortingto full wave simulation coupled to the dynamics of charge carries photoexcitedby infrared radiation in semiconductor layers.

Terahertz active spatial filtering through optically tunable hyperbolic metamaterials