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arXiv · 2109.01969

Dual-band nonreciprocal thermal radiation by coupling optical Tamm states in magnetophotonic multilayers

Jun Wu·Feng Wu·Tiancheng Zhao·Mauro Antezza·Xiaohu Wu
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Abstract

Kirchhoff s law is one of the most fundamental law in thermal radiation. The violation of traditional Kirchhoff s law provides opportunities for higher energy conversion efficiency. Various micro-structures have been proposed to realize single-band nonreciprocal thermal emitters. However, dual-band nonreciprocal thermal emitters remain barely investigated. In this paper, we introduce magneto-optical material into a cascading one-dimensional (1-D) magnetophotonic crystal (MPC) heterostructure composed of two 1-D MPCs and a metal layer. Assisted by the nonreciprocity of the magneto-optical material and the coupling effect of two optical Tamm states (OTSs), a dual-band nonreciprocal lithography-free thermal emitter is achieved. The emitter exhibits strong dual-band nonreciprocal radiation at the wavelengths of 15.337 um and 15.731 um when the external magnetic field is 3 T and the angle of incidence is 56 degree. Besides, the magnetic field distribution is also calculated to confirm that the dual-band nonreciprocal radiation originates from the coupling effect between two OTSs. Our work may pave the way for constructing dual-band and multi-band nonreciprocal thermal emitters.

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Jun Wu, Feng Wu, Tiancheng Zhao, Mauro Antezza, Xiaohu Wu. 2021-09-05. Dual-band nonreciprocal thermal radiation by coupling optical Tamm states in magnetophotonic multilayers. https://doi.org/10.1016/j.ijthermalsci.2022.107457

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