Author:Dudley, Angela L; Vasilyeu, R; Belyi, V; Khilo, N; Ropot, P; Forbes, ADate:Sep 2010The authors implement a novel technique to operate a phase-only spatial light modulator (SLM) in amplitude mode, allowing them to reproduce Durnin’s ring slit on a liquid crystal display (LCD). The affects of binary and continuous phase ...Read more
Author:Dudley, Angela L; Litvin, I; Roux, FS; Forbes, ADate:Jul 2012This presentation analyses the azimuthal decomposition of optical modes. Decomposition of azimuthal modes need two steps, namely generation and decomposition. An azimuthally-varying phase (bounded by a ring-slit) placed in the spatial frequency ...Read more
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; Litvin, I; Roux, FS; Forbes, ADate:Feb 2013By using digital holograms, we present a simple technique for performing a complete azimuthal decomposition of an arbitrary laser mode. The match-filter, used to perform the azimuthal decomposition, is bounded by an annular ring, allowing us ...Read more
Author:Dudley, Angela L; Schulze, C; Roux, FS; Duparré, M; Forbes, ADate:Jun 2013In this work we present a mechanism for generating superpositions of non-canonical, higherorder Bessel beams, which are characterized by the anisotropy of the optical vortex on the propagation axis, known as the morphology parameter. We ...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:Mhlanga, T; Dudley, Angela L; McDonald, Andre M; Roux, FS; Lavery, M; Padgett, M; Forbes, ADate:Feb 2013A procedure to efficiently sort orbital angular momentum (OAM) states of light, by performing a Cartesian to log-polar coordinate transformation which translates helically phased beams into a transverse phase gradient, currently exists1. We ...Read more
Author:Dudley, Angela L; Lib, Y; Mhlanga, T; Escuti, M; Forbes, ADate:Mar 2014We demonstrate how to create non-diffracting vector Bessel beams by implementing a spatial light modulator (SLM) to generate scalar Bessel beams which are then converted into vector fields by the use of an azimuthally-varying birefringent ...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:Dudley, Angela L; Litvin, I; Forbes, ADate:Jan 2012To measure the Orbital Angular Momentum (OAM) density of superposition fields two steps are needed: generation and measurement. An azimuthally-varying phase (bounded by a ring-slit) placed in the spatial frequency domain produces a higher-order ...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; Rop, R; Litvin, IA; Lopez-Mariscal, C; Roux, FS; Forbes, ADate:Aug 2012We experimentally generated superpositions of higher-order Bessel beams that possess no global orbital angular momentum (OAM), yet exhibit an angular rotation in their intensity profile as the field propagates. The digital holograms encoded ...Read more