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Nonreciprocal elements are a vital building block of electrical and opticalsystems. In the infrared regime, there is a particular interest in structuresthat break reciprocity because their thermal absorptive (and emissive)properties should not obey the Kirchhoff thermal radiation law. In this work,we break time-reversal symmetry and reciprocity in n-type doped magneto-opticInAs with a static magnetic field where light coupling is mediated by aguided-mode-resonator (GMR) structure whose resonant frequency coincides withthe epsilon-near-zero (ENZ) resonance of the doped InAs. Using this structure,we observe the nonreciprocal absorptive behavior as a function of magneticfield and scattering angle in the infrared. Accounting for resonant andnonresonant optical scattering, we reliably model experimental results thatbreak reciprocal absorption relations in the infrared. The ability to designsuch nonreciprocal absorbers opens an avenue to explore devices with unequalabsorptivity and emissivity in specific channels.

Nonreciprocal Infrared Absorption via Resonant Magneto-optical Coupling to InAs