ArticleNanophotonics (Berlin, Germany)2026
Tunable Unidirectional Guided Resonances via Multi-Singularity Interactions in Momentum Space.
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
The topological nature of bound states in the continuum (BICs) has attracted significant interest in manipulating resonant states and light radiation through topological singularities in momentum space. In this work, we present a scheme to realize tunable unidirectional guided resonances (UGRs) based on interactions between multiple circularly polarized states (C points) in momentum space. We first demonstrate that C points can intrinsically exist around symmetry-protected BICs in photonic crystal slabs even without any symmetry reduction. Through controlled symmetry breaking, the BIC splits into a pair of C points, which can interact with the intrinsic ones. Their interactions lead to rich evolution processes of C points, including formation of two UGRs at different
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