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Full wavefront control by photonic components requires that the spatial phase modulation on an incoming optical beam ranges from 0 to 2π. All optical components are intrinsically non-Hermitian, often described by reflection and transmission matrices with complex eigenfrequencies. We discovered that crossing the discontinuity branch bridging a Zero and a Pole along the real frequency axis provides a universal 0 to 2π spectral phase variation of an output channel as a function of the real frequency excitation. This basic understanding is applied to engineer electromagnetic fields at metasurfaces. Non-Hermitian topological features associated with exceptional degeneracies or branch cut crossing are shown to play a surprisingly pivotal role in the design of resonant photonic systems.
Patrice Genevet
"Understanding resonant metasurfaces from the perspective of topological photonics", Proc. SPIE PC12897, High Contrast Metastructures XIII, PC1289703 (13 March 2024); https://doi.org/10.1117/12.3002764
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Patrice Genevet, "Understanding resonant metasurfaces from the perspective of topological photonics," Proc. SPIE PC12897, High Contrast Metastructures XIII, PC1289703 (13 March 2024); https://doi.org/10.1117/12.3002764