Bridging the Fabry–Perot cavity and asymmetric Berreman mode for long-wave infrared nonreciprocal thermal emitters  

作　　者：CHEN ZiHe YU ShiLv HU Run 

机构地区：[1]School of Energy and Power Engineering,Huazhong University of Science and Technology,Wuhan 430074,China [2]Wuhan National Laboratory for Optoelectronics,Huazhong University of Science and Technology,Wuhan 430074,China [3]Department of Applied Physics,Kyung Hee University,Gyeonggi-do 17104,Republic of Korea

出　　处：《Science China(Technological Sciences)》2024年第10期3285-3293,共9页中国科学（技术科学英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.52211540005 and 52076087);the Natural Science Foundation of Hubei Province(Grant No.2023AFA072);the Open Project Program of Wuhan National Laboratory for Optoelectronics(Grant No.2021WNLOKF004);Wuhan Knowledge Innovation Shuguang Program,and the Fundamental Research Funds for the Central Universities(Grant No.YCJJ20242102).

摘　　要：The long-wave infrared band(8–14μm)is essential for several applications,such as infrared detection,radiative cooling,and near-field heat transfer.However,according to Kirchhoff’s law,the intrinsic balance between thermal absorption and emission limits the further improvement of photon energy conversion and thermal management.Thus,breaking Kirchhoff’s balance and achieving nonreciprocal thermal radiation in the long-wave infrared band are necessary.Most existing designs for nonreciprocal thermal emitters rely on grating or photonic crystal structures to achieve nonreciprocal thermal radiation at narrow peaks,which are relatively complex and typically realize bands larger than 14μm.Here,a sandwich structure consisting of an epsilon-nearzero(ENZ)magneto-optical layer(MOL),a dielectric layer(DL),and a metal layer is proposed to achieve a strong nonreciprocal effect in the long-wave infrared band,which is mainly attributed to the strengthening of the asymmetric Berreman mode by the Fabry–Perot cavity.In addition,the impact of the incident angle,DL thickness,and DL refractive index on the nonreciprocal thermal radiation has been investigated.Moreover,by replacing the ENZ MOL with the gradient ENZ MOL,the existence of the DL can further improve the nonreciprocity of the broadband nonreciprocal thermal radiation.The proposed work promotes the development and application of nonreciprocal energy devices.

关 键 词：long-wave infrared band nonreciprocal thermal radiation sandwich structure Fabry–Perot cavity asymmetric berreman mode 

分 类 号：TN215[电子电信—物理电子学]