Control of spatially rotating structures in diffractive Kerr cavities

Yao, Alison M. and Gibson, Christopher J. and Oppo, Gian-Luca (2019) Control of spatially rotating structures in diffractive Kerr cavities. Optics Express, 27 (22). pp. 31273-31289. ISSN 1094-4087 (https://doi.org/10.1364/OE.27.031273)

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Abstract

Turing patterns in self-focussing nonlinear optical cavities pumped by beams carrying orbital angular momentum (OAM) m are shown to rotate with an angular velocity ω=2m/R2 on rings of radii R. We verify this prediction in 1D models on a ring and for 2D Laguerre-Gaussian and top-hat pumps with OAM. Full control over the angular velocity of the pattern in the range −2m/R2≤ω≤2m/R2 is obtained by using cylindrical vector beam pumps that consist of orthogonally polarized eigenmodes with equal and opposite OAM. Using Poincaré beams that consist of orthogonally polarized eigenmodes with different magnitudes of OAM, the resultant angular velocity is ω=(mL+mR)/R2, where mL,mR are the OAMs of the eigenmodes, assuming good overlap between the eigenmodes. If there is no, or very little, overlap between the modes then concentric Turing pattern rings, each with angular velocity ω=2mL,R/R2 will result. This can lead to, for example, concentric, counter-rotating Turing patterns creating an optical peppermill-type structure. Full control over the speeds of multiple rings has potential applications in particle manipulation and stretching, atom trapping, and circular transport of cold atoms and BEC wavepackets.

  • Item type:Article
    ID code:70142
    Dates:
    Date
    Event
    28 October 2019
    Published
    19 September 2019
    Accepted
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:16 Oct 2019 11:52
    Last modified:11 Apr 2024 01:48
    URI:https://strathprints.strath.ac.uk/id/eprint/70142
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