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SUMMARY:Optical angular momentum and some applications - Prof. R.E. Burge\
 , SMF Group\, Cavendish Laboratory
DTSTART:20071115T160000Z
DTEND:20071115T170000Z
UID:TALK8404@talks.cam.ac.uk
CONTACT:Stephen Walley
DESCRIPTION:An optical beam with a helical phase is characterised by an /l
 / start (alternatively /l/ charge) helical wave front as produces by e.g. 
 a spiral zone plate or a holographic element. Helical wave fronts also occ
 ur in Laguerre-Gaussian beams and higher order Bessel beams. The helical w
 ave carries angular momentum and on propagation produces optical vortices.
  Photon spin (due to circular polarisation) and optical angular momentum (
 helical waves) will be briefly discussed.  \nApplications to be considered
  include (a) the trapping and rotation of particles\, (b) modification of 
 the shape of the dark vortex core to guide particles into required pattern
 s and assemblies\, (c) fractal zone plates for producing a sequence of foc
 used and structured optical vortices along the propagation direction (d) t
 he self-reconstructive properties of integer and fractional Bessel beams a
 nd special applications of the latter\, (e) variations in optical angular 
 momentum to encode data of different charges for secure free-space optical
  transmission. \n\n* Work in collaboration with my previous PhD student\, 
 Professor Xiaocong Yuan\, and his colleagues.  Professor Yuan is soon to b
 e appointed to a Chair of Optical Engineering in Nankai University\, Tianj
 in\, China.\n
LOCATION:Mott Seminar Room\, Cavendish Laboratory\, Department of Physics
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