Realization of photonic spin Hall effect by breaking the rotation symmetry of optical field in light–matter interaction
| Autor: | Hailu Luo, Weixing Shu, Jin Zhang, Yuanyuan Liu, Xiaohui Ling, Shuangchun Wen, Yougang Ke |
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| Rok vydání: | 2018 |
| Předmět: |
Physics
Condensed matter physics business.industry 02 engineering and technology Dielectric Optical field 021001 nanoscience & nanotechnology Polarization (waves) 01 natural sciences Waveplate Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Vortex Optics 0103 physical sciences Spin Hall effect Light beam Electrical and Electronic Engineering Physical and Theoretical Chemistry Photonics 010306 general physics 0210 nano-technology business |
| Zdroj: | Optics Communications. 427:238-243 |
| ISSN: | 0030-4018 |
| DOI: | 10.1016/j.optcom.2018.06.056 |
| Popis: | Photonic spin Hall effect (SHE) manifests itself as spin-dependent shift or splitting of a light beam, which is derived from spin–orbit interactions, and can be realized by breaking the rotation symmetry of light–matter interaction systems. Here, we demonstrate the observation of a photonic SHE by breaking the rotation symmetry of the optical field, while keeping the rotation symmetry of the inhomogeneous waveplate. The inhomogeneous waveplate constructed by dielectric nanostructures, introduces a spin-dependent Pancharatnam–Berry phase to the two spin components of the input beam, i.e., the left- and right-circular polarization components acquire exactly opposite vortex phases. During beam propagation, they experience opposite azimuthal rotations, and induce a four-lobe spin-dependent splitting in the azimuthal direction. In addition, the spin-dependent splitting becomes more evident upon beam propagation, and can be enhanced by increasing the topological orders of the nanostructures. For comparison, we also examine that no spin-dependent splitting can be observed when keeping the rotation symmetry of the incident optical field. |
| Databáze: | OpenAIRE |
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