Open AccessControlled negative energy flow in the focus of a radial polarized optical beam
Author(s) -
Hehe Li,
Chen Wang,
Miaomiao Tang,
Xinzhong Li
Publication year - 2020
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.391398
Subject(s) - polarization (electrochemistry) , optics , physics , light beam , radial polarization , topological quantum number , optical vortex , circular polarization , beam (structure) , energy flow , laser beams , laser beam quality , energy (signal processing) , laser , quantum mechanics , chemistry , microstrip
The controlled and continuous negative energy flow (from negative to positive) on the optical axis in the focal region is obtained by adjusting the polarization distribution of the input second-order radially polarized beam (the polarization topological charge is equal to 2). Moreover, the similar evolution of negative energy flow also can be achieved for the tightly focused vector beams with polarization topological charge -2. It is because both the beams with polarization topological charges 2 and -2 can possess the same polarization and spin flow density distributions with the help of the polarization modulation. The results provide a potential method for modulating the effects induced by the spin-orbit coupling in tight focusing of optical beam.