Open AccessRevolving and spinning of optical patterns by two coaxial spiraling elliptic beams in nonlocal nonlinear media
Author(s) -
Guo Liang
Publication year - 2019
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.27.014667
Subject(s) - physics , optical vortex , optics , angular momentum , rotation (mathematics) , spinning , coaxial , light beam , vortex , beam (structure) , envelope (radar) , soliton , phase (matter) , perpendicular , nonlinear system , classical mechanics , geometry , mechanics , quantum mechanics , telecommunications , materials science , radar , mathematics , computer science , composite material
Rotating patterns can be produced by two coaxial spiraling elliptic beams in nonlocal nonlinear media. The two constituent beams carry the orbital angular momentum (OAM), which has the same or opposite signs. The resultant patterns exhibit revolving and spinning rotations similar to the Sun-Earth system. The revolving-typed rotation comes of the overall OAM, while the spinning-typed rotation results from the respective OAM of the constituent beam. A kind of soliton patterns can stably exist, for which a vortex is nested centrally in the rotating square-shaped optical envelope and four peaks appear at four corners. The centrally nested vortex splits into two single vortex for r≠1, with r being the power ratio between the two constituent beams. The two single vortexes align vertically for r<1 and horizontally for r>1, and their spacing increases with |r-1|. The theoretical results give a possibility of the transforming from cross-phase-typed OAM into the helical-phase-typed OAM, which may find potential applications in beam shaping and controlling. In addition, the square optical envelope may exhibit advantages in the integration of optical components.