Asymmetric frequency conversion and violation of Kirchhoff’s law of thermal radiation in phased Floquet metasurfaces
Year: 2026
Type: article
Abstract: We study a system of three closely spaced conducting sheets whose thermal emission largely violates Kirchhoff's law through nonreciprocal frequency conversion enabled by Floquet phenomena. We leverage surface-mode transitions controlled by temporal modulation of one of the metasurfaces, resulting in largely asymmetric frequency conversion. Our findings broaden the capabilities of Floquet metasurfaces for wave conversion and energy manipulation, paving the way toward magnet-free nonreciprocal photonic devices with opportunities for thermal management and efficient photonic refrigeration.
Source: Matter & Light
Institutions: National Sun Yat-sen University, City University of New York, CUNY Advanced Science Research Center, The University of Texas at Austin, Institute of Physics, University of Amsterdam, Centre National de la Recherche Scientifique, Institut Universitaire de France, Université de Montpellier, Laboratoire Charles Coulomb, The Graduate Center, CUNY, City College of New York
Language: English
Subfield: Civil and Structural Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
OpenAlex ID: W7221938085