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- W4387252457 abstract "We have developed a temporal coupled-mode theory based on quasi-normal modes to investigate the chiroptical effects in parity-time (PT) symmetric metasurfaces. The PT symmetry enforces a different constraint for the direct scattering matrix and the coupling constants, which is verified by calculating the transmission spectra originating from the chiral quasi-bound states in the continuum. What’s more, the scattering matrix can be analytically continued to the complex frequency plane. We find that the zero and pole singularities of the transmission coefficients and scattering matrix play an important role in the optical chirality. The pole singularities carry a quantized topological charge of −1. Our work paves the way for studying the enhanced optical chirality in non-Hermitian metasurfaces." @default.
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- W4387252457 date "2023-10-16" @default.
- W4387252457 modified "2023-10-18" @default.
- W4387252457 title "Temporal coupled-mode theory for PT-symmetric chiral metasurfaces" @default.
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- W4387252457 doi "https://doi.org/10.1364/ol.505451" @default.
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