ArticleNanophotonics (Berlin, Germany)2026
Broadband and Wide-Angle Nonreciprocal Electromagnetic Transport via Gradient Permeability-Near-Zero Metastructures.
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
Breaking time-reversal symmetry to achieve broadband and wide-angle nonreciprocity is critical in electromagnetic waves manipulation. While Epsilon-Near-Zero materials have revolutionized the control of Transverse Magnetic modes, realizing comparable broadband nonreciprocity for Transverse Electric (TE) modes remains a formidable challenge because the permeability of the magneto-optical materials is isotropic. Here, we propose a novel strategy utilizing gradient Permeability-Near-Zero (PNZ) subwavelength magnetic metastructures based on yttrium iron garnet thin films. By engineering the magnetic permeability tensor near the zero-index regime, we excite robust TE-polarized leaky modes (analogous to magnetic Berreman modes) in deep sub-wavelength films (<
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