Author:Dudley, Angela L; Litvin, IA; Forbes, ADate:Mar 2012In this work we derive expressions for the orbital angular momentum (OAM) density of light, for both symmetric and nonsymmetric optical fields, that allow a direct comparison between theory and experiment. We present a simple method for ...Read more
Author:Dudley, Angela L; Schulze, C; Litvin, I; Duparré, M; Forbes, ADate:Aug 2013Although many techniques are efficient at measuring optical orbital angular momentum (OAM), they do not allow one to obtain a quantitative measurement for the OAM density across an optical field and instead only measure its global OAM. Numerous ...Read more
Author:McLaren, M; Mhlanga, T; Padgett, MJ; Roux, FS; Forbes, ADate:Feb 2014Quantum entanglement between photon pairs is fragile and can easily be masked by losses in transmission path and noise in the detection system. When observing the quantum entanglement between the spatial states of photon pairs produced by ...Read more
Author:Ismail, Y; Khilo, N; Belyi, V; Forbes, ADate:Sep 2012We present a method for generating higher-order Bessel beams with z-dependent cone angles. Such fields, if engineered correctly, are shape invariant during propagation and thus do not suffer from a transition from a Bessel-shaped intensity ...Read more
Author:Belyi, VN; Kazak, NS; Khilo, NA; Forbes, A; Ropot, PIDate:Nov 2011In this paper the authors consider the angular spectrum of an apertured Bessel beam when the aperture is circular and shifted laterally with respect to the optical axis. Since the perturbation of the resulting angular spectrum is due to a ...Read more
Author:Dudley, Angela L; Vasilyeu, R; Forbes, A; Khilo, N; Ropot, P; Belyi, V; Kazak, NDate:Aug 2009This paper presents a mechanism for the generation of the superposition of higher-order Bessel beams, which implements a ring slit aperture and spatial light modulator (SLM). The experimental technique is also adapted to generate nondiffracting ...Read more
Author:Dudley, Angela L; Vasilyeu, R; Forbes, A; Khilo, N; Ropot, PDate:Jul 2009This poster presents a mechanism for the generation of the superposition of higher-order Bessel beams, which implements a ring slit aperture and spatial light modulator (SLM). The experimental technique is also adapted to generate nondiffracting ...Read more
Author:Dudley, Angela LDate:Jan 2012The 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
Author:Dudley, Angela L; Mhlanga, T; McDonald, Andre M; Roux, FS; Lavery, M; Padgett, M; Forbes, ADate:Sep 2013In this work we will present two techniques for the measurement of superimposed higher-order Bessel beams. In the first technique we will outline a simple approach using only a spatial light modulator and a Fourier transforming lens to decompose ...Read more