Kavli Affiliate: Harry Atwater
| First 5 Authors: Komron Shayegan, Bo Zhao, Yonghwi Kim, Shanhui Fan, Harry Atwater
| Summary:
Nonreciprocal elements are a vital building block of electrical and optical
systems. In the infrared regime, there is a particular interest in structures
that 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-optic
InAs with a static magnetic field where light coupling is mediated by a
guided-mode-resonator (GMR) structure whose resonant frequency coincides with
the epsilon-near-zero (ENZ) resonance of the doped InAs. Using this structure,
we observe the nonreciprocal absorptive behavior as a function of magnetic
field and scattering angle in the infrared. Accounting for resonant and
nonresonant optical scattering, we reliably model experimental results that
break reciprocal absorption relations in the infrared. The ability to design
such nonreciprocal absorbers opens an avenue to explore devices with unequal
absorptivity and emissivity in specific channels.
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