Asymmetric Frequency Conversion and Violation of Kirchhoff's Law of Thermal Radiation in Phased Floquet Metasurfaces
arXiv:2611.17062 · doi:10.1016/j.matlit.2026.100142
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 towards magnet-free nonreciprocal photonic devices with opportunities for thermal management and efficient photonic refrigeration.
arXiv comment22 pages, 6 figures
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