dc.contributor.author |
Roux, FS
|
|
dc.date.accessioned |
2011-10-07T09:43:21Z |
|
dc.date.available |
2011-10-07T09:43:21Z |
|
dc.date.issued |
2011-01 |
|
dc.identifier.citation |
Roux, FS. 2011. Evolution of optical vortex distributions in stochastic vortex fields. SPIE Photonics West, Moscone Center, San Francisco, California, USA, 22-27 January 2011 |
en_US |
dc.identifier.isbn |
9780819484871 |
|
dc.identifier.uri |
http://spie.org/x648.html?product_id=874610
|
|
dc.identifier.uri |
http://hdl.handle.net/10204/5210
|
|
dc.description |
SPIE Photonics West, Moscone Center, San Francisco, California, USA, 22-27 January 2011 |
en_US |
dc.description.abstract |
Stochastic vortex fields are found in laser speckle, in scintillated beams propagating through a turbulent atmosphere, in images of holograms produced by Iterative Fourier Transform methods and in the beams produced by certain diffractive optical elements, to name but a few. Apart from the vortex fields found in laser speckle, the properties and dynamics of stochastic vortex fields are largely unexplored. Stochastic vortex fields with non-equilibrium initial conditions exhibit a surprisingly rich phenomenology in their subsequent evolution during free-space propagation. Currently there does not exist a general theory that can predict this behavior and only limited progress has thus far been made in its understanding. Curves of the evolution of optical vortex distributions during free-space propagation that are obtained from numerical simulations, will be presented. A variety of different stochastic vortex fields are used as input to these simulations, including vortex fields that are homogeneous in their vortex distributions, as well as inhomogeneous vortex fields where, for example, the topological charge densities vary sinusoidally along one or two dimensions. Some aspects of the dynamics of stochastic vortex fields have been uncovered with the aid of these numerical simulations. For example, the numerical results demonstrate that stochastic vortex fields contain both diffusion and drift motions that are driven by local and global variations in amplitude and phase. The mechanisms for these will be explained. The results also provide evidence that global variations in amplitude and phase are caused by variations in the vortex distributions, giving rise to feedback mechanisms and nonlinear behavior. |
en_US |
dc.language.iso |
en |
en_US |
dc.publisher |
SPIE |
en_US |
dc.relation.ispartofseries |
Workflow request;7330 |
|
dc.subject |
Infinitesimal propagation equation |
en_US |
dc.subject |
Entangle photons |
en_US |
dc.subject |
Atmospheric turbulence |
en_US |
dc.subject |
Orbital angular momentum |
en_US |
dc.subject |
Decoherence |
en_US |
dc.subject |
Photonics |
en_US |
dc.subject |
Optical vortex |
en_US |
dc.subject |
Stochastic vortex fields |
en_US |
dc.title |
Evolution of optical vortex distributions in stochastic vortex fields |
en_US |
dc.type |
Conference Presentation |
en_US |
dc.identifier.apacitation |
Roux, F. (2011). Evolution of optical vortex distributions in stochastic vortex fields. SPIE. http://hdl.handle.net/10204/5210 |
en_ZA |
dc.identifier.chicagocitation |
Roux, FS. "Evolution of optical vortex distributions in stochastic vortex fields." (2011): http://hdl.handle.net/10204/5210 |
en_ZA |
dc.identifier.vancouvercitation |
Roux F, Evolution of optical vortex distributions in stochastic vortex fields; SPIE; 2011. http://hdl.handle.net/10204/5210 . |
en_ZA |
dc.identifier.ris |
TY - Conference Presentation
AU - Roux, FS
AB - Stochastic vortex fields are found in laser speckle, in scintillated beams propagating through a turbulent atmosphere, in images of holograms produced by Iterative Fourier Transform methods and in the beams produced by certain diffractive optical elements, to name but a few. Apart from the vortex fields found in laser speckle, the properties and dynamics of stochastic vortex fields are largely unexplored. Stochastic vortex fields with non-equilibrium initial conditions exhibit a surprisingly rich phenomenology in their subsequent evolution during free-space propagation. Currently there does not exist a general theory that can predict this behavior and only limited progress has thus far been made in its understanding. Curves of the evolution of optical vortex distributions during free-space propagation that are obtained from numerical simulations, will be presented. A variety of different stochastic vortex fields are used as input to these simulations, including vortex fields that are homogeneous in their vortex distributions, as well as inhomogeneous vortex fields where, for example, the topological charge densities vary sinusoidally along one or two dimensions. Some aspects of the dynamics of stochastic vortex fields have been uncovered with the aid of these numerical simulations. For example, the numerical results demonstrate that stochastic vortex fields contain both diffusion and drift motions that are driven by local and global variations in amplitude and phase. The mechanisms for these will be explained. The results also provide evidence that global variations in amplitude and phase are caused by variations in the vortex distributions, giving rise to feedback mechanisms and nonlinear behavior.
DA - 2011-01
DB - ResearchSpace
DP - CSIR
KW - Infinitesimal propagation equation
KW - Entangle photons
KW - Atmospheric turbulence
KW - Orbital angular momentum
KW - Decoherence
KW - Photonics
KW - Optical vortex
KW - Stochastic vortex fields
LK - https://researchspace.csir.co.za
PY - 2011
SM - 9780819484871
T1 - Evolution of optical vortex distributions in stochastic vortex fields
TI - Evolution of optical vortex distributions in stochastic vortex fields
UR - http://hdl.handle.net/10204/5210
ER -
|
en_ZA |