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Browsing by Subject "Optical fields"

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Accurate measurement of microscopic forces and torques using optical tweezers

Author: McLaren, M ; Sidderas-Haddad, E ; Forbes, A Date: Sep 2011 It is now well known that matter may be trapped by optical fields with high intensity gradients. Once trapped, it is then possible to manipulate microscopic particles using such optical fields, in so-called optical tweezers. Such optical ... Read more
Azimuthal decomposition with digital holograms

Author: Litvin, IA ; Dudley, Angela L ; Roux, FS ; Forbes, A Date: May 2012 We demonstrate a simple approach, using digital holograms, to perform a complete azimuthal decomposition of an optical field. Importantly, we use a set of basis functions that are not scale dependent so that unlike other methods, no knowledge ... Read more
Efficient sorting of Bessel beams

Author: Dudley, Angela L ; Mhlanga, T ; Lavery, M ; McDonald, Andre M ; Roux, FS ; Padget, M ; Forbes, A Date: Jan 2013 We demonstrate the efficient sorter of Bessel beams separating both the azimuthal and radial components. This is based upon the recently reported transformation of angular to transverse momentum states. We separately identify over forty ... Read more
Evolution of the scintillation index and the optical vortex density in speckle fields after removal of the least-squares phase

Author: Chen, M ; Roux, FS Date: Oct 2010 Knowledge of the behavior of stochastic optical fields can aid the understanding of the scintillation of light propagating through a turbulent medium. For this purpose, the authors perform a numerical investigation of the evolution of the ... Read more
Manipulating structured light

Author: Dudley, Angela L Date: Jul 2016 This presentation focuses on the manipulation of structured light. Structured light manipulation allows people to dynamical change the spatial profile of an optical field. Read more
Modal decomposition for measuring the orbital angular momentum density of light

Author: Schulze, C ; Flamm, D ; Dudley, Angela L ; Forbes, A ; Duparr'e, M Date: Feb 2013 We present a novel technique to measure the orbital angular momentum (OAM) density of light. The technique is based on modal decomposition, enabling the complete reconstruction of optical fields, including the reconstruction of the beams ... Read more
One-and two-dimensional topological charge distributions in stochastic optical fields

Author: Roux, FS Date: Jun 2011 The presentation on topological charge distributions in stochastic optical fields concludes that by using a combination of speckle fields one can produce inhomogeneous vortex distributions that allow both analytical calculations and numerical ... Read more
Superpositions of light fields carrying orbital angular momentum

Author: Dudley, Angela L Date: Jan 2012 The work presented in this thesis is centred on the generation of superimposed optical fields which each carry orbital angular momentum (OAM) and the development of OAM measurement techniques. Optical fields which carry OAM have found ... Read more
Unraveling light with digital holograms

Author: Forbes, A ; Schulze, C ; Ngcobo, Sandile ; Flamm, D ; Naidoo, Darryl ; Dudley, Angela L ; Duparre, M Date: Feb 2013 Modal decomposition of optical fields as a concept has been in existence for many decades, yet despite its clear applications to laser beam analysis it has nevertheless remained a seldom used tool. With the commercialization of liquid crystal ... Read more

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Browsing by Subject "Optical fields"

Browsing by Subject "Optical fields"

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