Extraordinary spin density and energy back-flow under interference
| Autor: | Zhen-Lai Wang, Xiang-Song Chen, Dan-Dan Lian |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Physics
Angular momentum Condensed matter physics business.industry Optical force Plane wave FOS: Physical sciences Polarization (waves) 01 natural sciences Atomic and Molecular Physics and Optics Vortex Magnetic field 010309 optics Transverse plane Optics 0103 physical sciences Poynting vector 010306 general physics business Optics (physics.optics) Physics - Optics |
| Zdroj: | Optics Express. 26:33712 |
| ISSN: | 1094-4087 |
| Popis: | A novel phenomenon was reported recently that the "local optical spin density" based on Poynting vector might be counter-intuitively opposite to the integrated spin orientation while the one related to the canonical expression might not [Leader, Phys. Lett. B 779, 385-387 (2018)]. However, the "local optical spin density" of the canonical expression can also be counter-intuitively opposite to the integrated spin orientation under the interference of plane waves, even if all of the plane waves possess the same polarization handedness. Moreover, the interference fields might acquire a transverse spin density (perpendicular to the propagation plane), which can have more well-controlled relations with the polarization. Meantime, in such a case its energy flux exhibits counter-intuitive back-flow and a circular motion (vortex) in the propagation plane locally, which implies a transverse local orbital angular momentum density. 4 pages, 3 figures |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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