Broadband nonreciprocal thermal emissivity and absorptivity  

作　　者：Komron J.Shayegan Jae S.Hwang Bo Zhao Aaswath P.Raman Harry A.Atwater 

机构地区：[1]Thomas J.Watson Laboratory of Applied Physics,California Institute of Technology,Pasadena,CA,USA [2]Department of Electrical Engineering,California Institute of Technology,Pasadena,CA,USA [3]Department of Materials Science and Engineering,University of California,Los Angeles,Los Angeles,CA,USA [4]Department of Mechanical Engineering,University of Houston,Houston,TX,USA

出　　处：《Light(Science & Applications)》2024年第9期1820-1827,共8页光（科学与应用)（英文版）

基　　金：support from the US Department of Energy(DOE)Basic Energy Science(BES)Physical Behavior of Materials program,under grant DE-FG02-07ER46405;supported by the National Science Foundation under grant no.ECCS-2146577(A.P.R.and J.S.H.).

摘　　要：A body that violates Kirchhoff’s law of thermal radiation exhibits an inequality in its spectral directional absorptivity and emissivity.Achieving such an inequality is of fundamental interest as well as a prerequisite for achieving thermodynamic limits in photonic energy conversion1 and radiative cooling2.Thus far,inequalities in the spectral directional emissivity and absorptivity have been limited to narrow spectral resonances3,or wavelengths well beyond the infrared regime4.Bridging the gap from basic demonstrations to practical applications requires control over a broad spectral range of the unequal spectral directional absorptivity and emissivity.In this work,we demonstrate broadband nonreciprocal thermal emissivity and absorptivity by measuring the thermal emissivity and absorptivity of gradient epsilon-near-zero InAs layers of subwavelength thicknesses(50 nm and 150 nm)with an external magnetic field.The effect occurs in a spectral range(12.5–16μm)that overlaps with the infrared transparency window and is observed at moderate(1 T)magnetic fields.

关 键 词：field. reciprocal THERMAL 

分 类 号：O17[理学—数学]