Tightly focused optical field with controllable photonic spin orientation
| Autor: | Qiwen Zhan, Ling Jiang Kong, Jian Chen, Chenhao Wan |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Physics
Diffraction Focal point Photon business.industry Physics::Optics 02 engineering and technology Optical field 021001 nanoscience & nanotechnology 01 natural sciences Atomic and Molecular Physics and Optics Numerical aperture 010309 optics Optics Electric field 0103 physical sciences Photonics 0210 nano-technology business Spin (physics) |
| Zdroj: | Optics express. 25(16) |
| ISSN: | 1094-4087 |
| Popis: | The spin angular momentum of photons offers a robust, scalable and high-bandwidth toolbox for many promising applications based upon spin-controlled manipulations of light. In this work, we develop a method to achieve controllable photonic spin orientation within a diffraction limited optical focal spot produced by a high numerical aperture objective lens. The required pupil field is found analytically through reversing the radiation patterns from two electric dipoles located at the focal point of the lens with orthogonal oscillation directions and quadrature phase. The calculated pupil fields are experimentally generated with a vectorial optical field generator. The produced photonic spin orientations are quantitatively evaluated by their spin densities according to the tightly focused electric fields calculated by Richard-Wolf vectorial diffraction theory to demonstrate the validity and capability of the proposed technique. |
| Databáze: | OpenAIRE |
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