ArticleNanophotonics (Berlin, Germany)2026
Phase Shift Compensation Enables Rainbow-Free, Ultrawide Angular, and Pattern-Free Nonreciprocal Thermal Emission.
Article in Nanophotonics (Berlin, Germany), 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Thermal emission from a conventional blackbody is inherently incoherent. Non-Kirchhoff thermal emitters, which exploit nontrivial nonreciprocal properties, enable unprecedented control over both the spatial and temporal coherence of thermal emission with enhanced degrees of freedom. Although violations of Kirchhoff's law have been demonstrated, achieving strong nonreciprocity while suppressing the rainbow effect across ultrawide angular ranges remains an open challenge. This study demonstrates a pattern-free Fabry-Pérot resonator comprising Weyl semimetal/germanium heterostructures on a silver substrate that achieves rainbow-free nonreciprocal thermal emission with exceptional angular stability. The Weyl semimetal serves dual functions: simultaneously breaking Lorentz reciprocity and providing dynamic phase shift compensation, enabling the structure to maintain nonreciprocity exceeding 0.6 or 0.8 across an ultrawide angular range of Δ
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