Observation of Janus Chirality for Coherent Thermal Emission from Metasurfaces
Abstract
Metasurfaces emerged as a powerful tool for controlling thermal radiation, yet achieving coherent emission with opposite circular handednesses remains a highly challenging problem. Here, we demonstrate experimentally the Janus chiral thermal emission from metasurfaces with opposite circular handednesses on either side of a single device. We employ anisotropic metasurfaces supporting high-Q resonances with photonic flatbands enabling near-unity circular dichroism through in-plane symmetry control. Our experiments confirm the Janus coherent emission, and they are validated by the results of the coupled-mode theory. The flatband resonant metasurfaces enabling a control of chiral thermal emission provide an efficient platform for spin-controlled light-matter interaction.
Keywords
Cite
@article{arxiv.2601.22506,
title = {Observation of Janus Chirality for Coherent Thermal Emission from Metasurfaces},
author = {Kaili Sun and Yangjian Cai and Maxim V. Gorkunov and Yuri Kivshar and Zhanghua Han},
journal= {arXiv preprint arXiv:2601.22506},
year = {2026}
}