Kavli Affiliate: Harry Atwater
| First 5 Authors: Bardia Nabavi, Sina Jafari Ghalehkohne, Komron J. Shayegan, Eric J. Tervo, Harry Atwater
| Summary:
Nonreciprocal thermal emitters that break the conventional Kirchhoff’s law
allow independent control of emissivity and absorptivity and promise exciting
new functionalities in controlling heat flow for thermal and energy
applications. In enabling some of these applications, nonreciprocal thermal
emitters will unavoidably need to serve as hot emitters. Leveraging
magneto-optical effects, degenerate semiconductors have been demonstrated as a
promising optical material platform for nonreciprocal thermal radiation.
However, existing modeling and experimental efforts are limited to near room
temperature (< 373 K), and it remains elusive whether nonreciprocal properties
can persist at high temperatures. In this work, we demonstrate strong
nonreciprocal radiative properties at temperatures up to 600 K. We propose a
theoretical model by considering the temperature dependence of the key
parameters for the nonreciprocal behavior and experimentally investigate the
temperature dependence of the nonreciprocal properties of InAs, a degenerate
semiconductor, using a customized angle-resolved high-temperature magnetic
emissometry setup. Our theoretical model and experimental results show an
agreement, revealing that strong nonreciprocity can persist at temperatures
over 800 K for high-temperature stable semiconductors, enabling a pathway for
nonreciprocal radiative heat flow control at high temperatures.
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