Author:Litvin, IADate:Jun 2012In this work we investigate the behavior of the instantaneous Poynting vector of symmetrical paraxial laser beams, namely the modification of the instantaneous Poynting vector and the radiation pattern during propagation in free space for a ...Read more
Author:Dudley, Angela L; Vasilyeu, R; Belyi, V; Khilo, N; Ropot, P; Forbes, ADate:Sep 2011In this work we investigate the structure of nondiffracting speckle fields, both experimentally and theoretically. We are able to produce very good agreement between the experimentally recorded and theoretically calculated fields by using ...Read more
Author:Litvin, IA; Forbes, ADate:2005Bessel beams have gathered much interest of late due to their properties of near diffraction free propagation and self reconstruction after obstacles. Such laser beams have already found applications in fields such as optical tweezers and ...Read more
Author:Dudley, Angela L; Mhlanga, T; Lavery, M; McDonald, Andre M; Roux, FS; Padget, M; Forbes, ADate:Jan 2013We 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
Author:Dudley, Angela L; Li, Y; Mhlanga, T; Escuti, M; Forbes, ADate:Sep 2013Nondiffracting vector Bessel beams are of considerable interest due to their nondiffracting nature and unique high-numerical-aperture focusing properties. Here we demonstrate their creation by a simple procedure requiring only a spatial light ...Read more
Author:Vasilyeu, R; Dudley, Angela L; Khilo, N; Forbes, ADate:Dec 2009The authors report the first experimental generation of the superposition of higher-order Bessel beams, by means of a spatial light modulator (SLM) and a ring slit aperture. They present illuminating a ring slit aperture with light which has ...Read more
Author:Schulze, C; Dudley, Angela L; Flamm, D; Duparre, M; Forbes, ADate:Jul 2013We demonstrate a versatile method for the measurement of the orbital angular momentum (OAM) density of an optical field. By performing a modal decomposition with digital holograms, we reconstruct the full optical field from a small set of ...Read more
Author:Milione, G; Dudley, Angela L; Nguyen, TA; Chakraborty, O; Karimi, E; Forbes, A; Alfano, RDate:Feb 2015We experimentally measured the self-healing of the spatially inhomogeneous states of polarization of vector Bessel beams. Radially and azimuthally polarized vector Bessel beams were experimentally generated via a digital version of Durnin's ...Read more
Author:Litvin, IA; Dudley, Angela L; Forbes, ADate:Aug 2011The authors study theoretically the orbital angular momentum (OAM) density in arbitrary scalar optical fields, and outline a simple approach using only a spatial light modulator to measure this density. They demonstrate the theory in the ...Read more
Author:Belyi, VN; Khilo, NA; Kazak, NS; Ryzhevich, AA; Forbes, ADate:May 2011The authors investigate the generation and transformation of Bessel beams through linear and nonlinear optical crystals. They outline the generation of high-order vortices due to propagation of Bessel beams along the optical axis of uniaxial ...Read more
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: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