Manipulation and removal of defects in spontaneous optical patterns

Neubecker, R. and Benkler, E. and Martin, R. and Oppo, G.L. (2003) Manipulation and removal of defects in spontaneous optical patterns. Physical Review Letters, 91 (11). pp. 113903-1. ISSN 1079-7114 (http://dx.doi.org/10.1103/PhysRevLett.91.113903)

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Abstract

Defects play an important role in a number of fields dealing with ordered structures. We demonstrate theoretically and experimentally the possibility of an active manipulation of defects in terms of an externally induced motion. We focus on the spontaneous formation of two-dimensional spatial structures in a nonlinear-optical system, a liquid crystal light valve under single optical feedback. For a particular parameter setting, a spontaneously formed hexagonal intensity pattern contains several dislocation-type defects. A scheme based on Fourier filtering allows us to restore spatial order in a selectable part of the pattern. Starting without control, the controlled area is progressively expanded, such that defects are swept out of the pattern.

  • Item type:Article
    ID code:2937
    Dates:
    Date
    Event
    September 2003
    Published
    Subjects:Science > Physics > Optics. Light
    Department:Faculty of Science > Physics
    Depositing user: Mr Derek Boyle
    Date deposited:20 Feb 2007
    Last modified:08 Apr 2024 15:28
    URI:https://strathprints.strath.ac.uk/id/eprint/2937
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