Knotted and tangled threads of darkness in light beams

Padgett, M. , O'Holleran, K., King, R.P. and Dennis, M.R. (2011) Knotted and tangled threads of darkness in light beams. Contemporary Physics, 52(4), pp. 265-279. (doi:10.1080/00107514.2011.574496)

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Publisher's URL: http://dx.doi.org/10.1080/00107514.2011.574496

Abstract

When multiple light beams overlap in three-dimensional space, their interference produces tangled lines of complete darkness. These lines are called optical vortices and may be infinitely long, or form closed loops which can be linked or knotted. The vortex lines can be obtained from combining random waves (such as optical speckle). Alternatively, specific configurations of looped, linked or knotted vortex lines may be produced using holographic techniques to implement mathematically derived constructions. In the random superpositions, numerical experiments indicate that the tangle of vortex lines has a fractal nature, whereas the holographic approach allows the construction of isolated optical vortex knots. The presence of such a knot has implications for the topology of the whole field. Whether such topological features produced by interfering waves are merely curiosities or correspond to subtle physical phenomena remains an open question.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:O'Holleran, Mr Kevin and Padgett, Professor Miles
Authors: Padgett, M., O'Holleran, K., King, R.P., and Dennis, M.R.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Contemporary Physics
ISSN:0010-7514
ISSN (Online):1366-5812
Published Online:16 May 2011

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