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Disorder-induced optical transition from spin Hall to random Rashba effect
Elhanan Maguid1, Michael Yannai1, Arkady Faerman1
1Micro and Nanooptics Laboratory, Faculty of Mechanical Engineering, and Russell Berrie Nanotechnology Institute, Technion-Israel Institute of Technology, Haifa 3200003, Israel.
Science (New York, N.Y.)
|December 16, 2017
Summary
Disordered structures reveal novel photonic spin-optical transport phenomena. Weak disorder causes a spin Hall effect, while strong disorder induces spin-split modes, showcasing complex light-matter interactions.
Area of Science:
- Photonics
- Condensed Matter Physics
- Quantum Optics
Background:
- Disordered structures exhibit complex light interactions.
- Geometric phase in photonics is crucial for light manipulation.
- Spin-orbit coupling influences optical phenomena.
Purpose of the Study:
- Investigate spin-symmetry breaking in disordered geometric phase structures.
- Explore novel spin-optical transport phenomena.
- Understand the role of disorder strength and topology.
Main Methods:
- Fabrication of subwavelength-scale disordered geometric phase structures.
- Utilizing quantum weak measurements to observe effects.
- Analyzing momentum space entropy and topological features.
Main Results:
- Observed photonic spin Hall effect under weak disorder.
- Identified spin-split modes (random optical Rashba effect) under strong disorder.
- Revealed an optical transition linked to vanishing anisotropy and demonstrated vortex interactions.
Conclusions:
- Disordered geometric phase structures enable photonic spin-symmetry breaking.
- These structures serve as a platform for studying spin-orbit coupling in complex media.
- Novel spin-optical transport phenomena are accessible through controlled disorder.
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