Session: 11-10-04: Radiative Heat Transfer Across Scales

Paper Number: 146047

146047 - Emissometry for Nonreciprocal Thermal Radiative Properties Measurement 

Objects around us constantly emit and absorb thermal radiation. The basic properties that characterize these two processes are emissivity and absorptivity, respectively. For reciprocal systems, the emissivity and absorptivity for a given direction, polarization, and frequency are tightly restricted to be equal by Kirchhoff's law of thermal radiation. Recent research has shown that materials with magneto-optical effects such as InAs in the presence of an external magnetic field can break Kirchhoff's law, yielding nonreciprocal thermal radiation. Despite early experimental efforts for nonreciprocal thermal radiation, it remains a challenge to measure nonreciprocal thermal emission, especially for samples with large areas on the order of several cm². Here we propose an emissometry that incorporates a magnetic assembly for nonreciprocal thermal emission measurement. Our design incorporates a cantilever structure made of nonmagnetic material, such that large samples can be heated up to nearly 1000 °C inside a magnetic field. We will discuss the calibration of the sample temperature and our measured results using InAs. Our newly designed emissometry represents a critical extension for the capability of thermal emission spectroscopy.

Presenting Author: Aniroodh Sivaraman University of Houston

Presenting Author Biography: Aniroodh Sivaraman is a PhD student at the University of Houston department of Mechanical Engineering.

Authors:

Sahag Bozoian University of Houston
Aniroodh Sivaraman University of Houston
Bo Zhao University of Houston