Understanding resonant metasurfaces from the perspective of topological photonics

Patrice Genevet

doi:10.1117/12.3002764

13 March 2024 Understanding resonant metasurfaces from the perspective of topological photonics

Patrice Genevet

Proceedings Volume PC12897, High Contrast Metastructures XIII; PC1289703 (2024) https://doi.org/10.1117/12.3002764
Event: SPIE OPTO, 2024, San Francisco, California, United States

Abstract

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.

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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

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KEYWORDS

Photonics

Phase shift keying

Reflection

Modulation

Polarization

Absorption

Optical transmission

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