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Reflective Spin-Orbit Geometric Phase from Chiral Anisotropic Optical Media
Mushegh Rafayelyan1,2, Georgiy Tkachenko1,2, Etienne Brasselet1,2
1Université Bordeaux, LOMA, UMR 5798, F-33400 Talence, France.
Physical Review Letters
|July 9, 2016
Summary
Researchers developed novel "Bragg-Berry" optical elements for precise light control. These highly reflective elements utilize a unique Bragg-reflection phenomenon to manipulate spin-orbit properties of light efficiently.
Area of Science:
- Optics
- Condensed Matter Physics
- Materials Science
Background:
- Spin-orbit optics traditionally relies on birefringent phase retardation.
- Geometric phase elements offer an alternative for light manipulation.
Purpose of the Study:
- To introduce and demonstrate a new class of highly reflective optical elements based on spin-orbit geometric phase.
- To explore the use of chiral Bragg mirrors for efficient light field tailoring.
Main Methods:
- Experimental demonstration of a dynamical geometric phase using a flat chiral Bragg mirror.
- Investigation of optical vortex generation from chiral liquid crystal droplets in the Bragg regime.
Main Results:
- Achieved efficient spin-orbit tailoring of light fields without birefringent phase retardation.
- Demonstrated the influence of droplet curvature on spin-orbit consequences in the Bragg regime.
Conclusions:
- Introduced a novel class of optical elements: "Bragg-Berry" optical elements.
- Showcased the potential of helicity-preserving circular Bragg reflection for advanced optical functionalities.
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