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Browsing by Author "Forbes, A"

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  • Katumba, G; Olumekor, L; Forbes, A; Wackelgard, E (2006-07)
    The investigation and development of carbon-silica composites has been going on for some time. Different applications such as adsorbents, biosensors, templates and solar absorbers have emanated from these studies. The ...
  • Yalisi, B; Katumba, G; Forbes, A; Pillay, SR (2009-06)
    Selective solar absorbers are devices that have been designed to absorb as much as possible of the solar radiation which is in the wavelength range of 0.3 to 2.5 µm and to minimise thermal emittance in the wavelength range ...
  • Masina, BN; Lafane, S; Wu, L; Kerdja, T; Abdelli-Messaci, S; Forbes, A (2013-10)
    The main objective of this study is to fully optimise the synthesis of vanadium oxide nanostructures using pulsed laser deposition. We will attempt to realise this by studying the mechanism of the plasma formation and ...
  • Nkosi, SS; Gavi, HM; Motaung, DE; Keartland, J; Sideras-Haddad, E; Forbes, A; Mwakikunga, BW (Hindawi Publishing Corporation, 2013)
    Electron spin resonance (ESR) measurements at room temperature and X-band microwave frequency were performed on highly crystalline FePt system thin films. Fairly high DC static magnetic field absorption of about 300 mT was ...
  • Govender, M; Shikwambana, L; Mwakikunga, BW; Sideras-Haddad, E; Erasmus, RM; Forbes, A (Springer, 2010-06)
    This report focuses on the production of multi-phase WO3 and WO3-x (where x could vary between 0.2 and 0.33) nanostructures synthesized by CO2-laser pyrolysis technique at varying laser wavelengths (9.22-10.82 mm) and power ...
  • Gailele, Lucas M; Dudley, Angela; Ndagano, B; McLaren M, M; Rosales, C; Forbes, A (2016-07)
    The orbital angular momentum (OAM) of light has become the focus of intensive research. Traditional optical communication systems optimize multiplexing in the polarization and the wavelength of light to attain an increase ...
  • Dudley, Angela L; Forbes, A (Optical Society of America, 2012-04)
    In this work we use a phase-only spatial light modulator (SLM) to mimic a ring-slit aperture, containing multiple azimuthally varying phases at different radial positions. The optical Fourier transform of such an aperture ...
  • Mafusire, C; Forbes, A; Snedden, Glen C; Mahlase, ACK; Michaelis, MM; Mathuthu, M (2006-07)
    When a heated pipe is rotated, the dynamics of the gas inside exhibit properties reminiscent of a solid-state positive lens. The properties are a result of a parabolic distribution of refractive index in the pipe which is ...
  • Litvin, IA; Forbes, A (Optical Society of America, 2009-10)
    The authors outline a resonator design that allows for the selection of a Gaussian mode by diffractive optical elements. This is made possible by the metamorphosis of a Gaussian beam into a flat-top beam during propagation ...
  • Mafusire, C; Forbes, A (Optical Society of America, 2011-07)
    The authors outline a theory for the calculation of the beam quality factor of an aberrated laser beam. They provide closed form equations that show that the beam quality factor of an aberrated Gaussian beam depends on all ...
  • Li, Y; Dudley, Angela L; Mhlanga, T; Escutia, MJ; Forbes, A (SPIE Proceedings, 2013-08)
    We experimentally generate non-diffracting vector vortex beams by using a Spatial Light Modulator (SLM) and an azimuthal birefringent plate (q-plate). The SLM generates scalar Bessel beams and the q-plate converts them to ...
  • Dudley, Angela L; Lib, Y; Mhlanga, T; Escuti, M; Forbes, A (SPIE Proceedings, 2014-03)
    We 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 ...
  • Dudley, Angela L; Li, Y; Mhlanga, T; Escuti, M; Forbes, A (Optical Society of America, 2013-09)
    Nondiffracting 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 ...
  • Vasilyeu, R; Dudley, Angela L; Khilo, N; Forbes, A (Optical Society of America, 2009-10)
    An experimental setup to generate a superposition of higher-order Bessel beams by means of a spatial light modulator and ring aperture is presented. The experimentally produced fields are in good agreement with those ...
  • Vasilyeu, R; Dudley, Angela L; Khilo, N; Forbes, A (Optical Society of America, 2009-12)
    The 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 ...
  • Forbes, A; Du Preez, N; Litvin, IA; Botha, LR (South African Institute of Physics (SAIP), 2009-07)
    Generation and application of high power flattened Gaussian beams. Presented at the 54th Annual Conference of the South African Institute of Physics (SAIP) 2009.
  • Belyi, VN; Khilo, NA; Forbes, A; Ryzhevich, AA (Society of Photo-optical Instrumentation Engineers (SPIE), 2009-08)
    Linear and nonlinear processes of transferring optical singularities from anisotropic crystals onto the wavefront of Bessel light beams (BLBs) are investigated. The generation of high-order vortices at the propagation of ...
  • Hendriks, A; Naidoo, Darryl; Roux, FS; Löpez-Mariscal, C; Forbes, A (SPIE, 2012-08)
    Phase-only spatial light modulators are now ubiquitous tools in modern optics laboratories, and are often used to generate so-called structured light. In this work we outline the use of a phase-only spatial light modulator ...
  • Ngcobo, S; Ait-Ameur, K; Forbes, A (2012-07)
    This work deals with the generation of symmetrical high order Laguerre Gaussian modes. These high order Laguerre-Gaussian beams are generated by forcing the laser using an annular binary Diffractive Optical Element whose ...
  • Ait-Ameur, K; Naidoo, Darryl; Ngcobo, S; Fromager, M; Litvin, I; Hasnaoui, A; Harfouche, A; Forbes, A (SPIE, 2015-02)
    A great number of laser applications need in place of the usual Gaussian beam a flat-top intensity profile in the focal plane of a focusing lens. In general the transformation of the laser beam from the Gaussian to the ...