Advanced Optical Materials· 2026Q1
Basis‐Independent Geometric Phase Modulation in Circularly Birefringent Plasmonic Structures
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- 2026year
Short summary
A plasmonic metasurface composed of chiral spiral unit cells generates geometric phase modulation under linear polarization, enabling a basis-independent approach to geometric phase accumulation.
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Key points
- Geometric phase modulation is achieved using circularly birefringent chiral spiral unit cells under linear polarization.
- The metasurface generates a space-variant circular retardance, creating a geometric phase ramp equivalent to a blazed grating.
- Diffraction orders are directly resolved using leakage radiation microscopy, with intensities dependent on input linear polarization.
- A theoretical analysis using rotated Poincaré space and direct Stokes parameter measurements confirm the geometric origin of the phase.
AI-generated from the title and abstract; the full text is not read.
Abstract
ABSTRACT Geometric phase in metasurfaces is conventionally realized using spatially rotated linearly birefringent meta–atoms under circularly polarized illumination. Here we demonstrate that a geometric phase modulation can be achieved through circular birefringence and observed under linear polarization excitation. We introduce a plasmonic metasurface composed of spatially rotated chiral spiral unit cells designed to produce space‐variant circular retardance. This generates a geometric phase ramp equivalent to a blazed grating, leading to diffraction orders in momentum space. Using leakage radiation microscopy, we directly resolve these orders and show how their intensities depend upon the input linear polarization confirming the geometric origin of the phase. We theoretically analyze the phenomenon using a rotated Poincaré space and confirm our results by direct Stokes parameters measurement. These results establish basis‐independent approach to geometric phase accumulation in circularly birefringent plasmonic metasurfaces.
The authors' abstract, as published at the source. Advanced Optical Materials, 2026 · DOI ↗
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Field: Electronic, Optical and Magnetic Materials
Electronic, Optical and Magnetic MaterialsMaterials Science