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In this work, we develop a homogenization model to determine the effectiveresponse of a metallic nanowire array embedded in an electric gyrotropicmaterial. We study the interaction of electromagnetic waves with themetamaterial and demonstrate that the nanowire array can greatly enhance thenonreciprocal response of the gyrotropic substrate. In particular, themetamaterial can either absorb the incoming energy almost entirely or reflectit with little loss, depending on the sign of the incidence angle. We explorethe implications of our findings in the context of Kirchhoff's law of thermalradiation. Our results demonstrate that the wire array can boost the differencebetween the emissivity and absorptivity in a broad spectrum of frequencies andincidence angles as compared to an unstructured gyrotropic substrate. Thesefindings suggest potential applications for the nonreciprocal wire medium inthermal management, radiative cooling, and others.

Enhancing the Directional Violation of Kirchhoff's Law of Thermal Radiation with a Nonreciprocal Wire Medium