3 papers
physics.optics2026
Unified Topological Dynamics of Merging Bound States in the Continuum for High-Order Topological Charges
Keren Wang, Lujun Huang, Wei Wang
Bound states in the continuum (BICs) are polarization singularities in momentum space whose topological charges (TCs) govern advanced light-matter interactions. While lattice symme…
physics.optics2025
Broadband-operational orbital angular momentum generation in nonlocal metasurfaces with maximum efficiency approaching 80%
Keren Wang, Kaili Sun, Jing Du +5
Nonlocal metasurfaces provide a compact route to generating momentum-space optical vortices but are limited by steep dispersion typically associated with high-quality (Q) factor re…
physics.optics2025
Anomalous Spontaneous Emission Enhancement by Non-Hermitian Momentum-Space Bound States in the Continuum
Keren Wang, Jing Du, Wei Wang
Conventional Purcell theory emphasizes high quality factors (Q) for spontaneous emission (SE) enhancement in cavities, but overlooks collective Bloch mode effects in periodic nanos…