ResearchSpace
→
Browsing by Subject

Browsing by Subject "Bessel beams"

Now showing items 1-20 of 30

Next Page

Affects of binary and continuous phase modulations on the structure of Bessel beams

Author: Dudley, Angela L ; Vasilyeu, R ; Belyi, V ; Khilo, N ; Ropot, P ; Forbes, A Date: Sep 2010 The 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
Azimuthal decomposition of optical modes

Author: Dudley, Angela L ; Litvin, I ; Roux, FS ; Forbes, A Date: Jul 2012 This 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
The behavior of the instantaneous Poynting vector of symmetrical laser beams

Author: Litvin, IA Date: Jun 2012 In 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
Characterisation of a Bessel beam optical cell sorting system using microspheres

Author: Lugongolo, Masixole Y ; Ombinda-Lemboumba, Saturnin ; Manoto, Sello L ; Mthunzi-Kufa, Patience Date: Feb 2020 Accurate sorting of specific particles in a mixed population is a desirable capability in the field of biomedical sciences. This enables researchers to purify samples by selecting only the particles of interest. Optical sorting is achieved ... Read more
Complete azimuthal decomposition of optical fields

Author: Dudley, Angela L ; Litvin, I ; Roux, FS ; Forbes, A Date: Feb 2013 By 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
Controlled acceleration of superimposed Bessel beams

Author: Dudley, Angela L ; Schulze, C ; Roux, FS ; Duparré, M ; Forbes, A Date: Jun 2013 In 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
Controlling the evolution of nondiffracting speckle by complex amplitude modulation on a phase-only spatial light modulator

Author: Dudley, Angela L ; Vasilyeu, R ; Belyi, V ; Khilo, N ; Ropot, P ; Forbes, A Date: Sep 2011 In 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
Creating and decomposing vector Bessel beams

Author: Dudley, Angela L ; Li, Y ; Mhlanga, T ; Escuti, M ; Forbes, A Date: Jul 2013 This is a paper presented on creating and decomposing vector Bessel beams, presented at the 58th annual SAIP conference. Read more
Effective and efficient method of calculating Bessel beam fields

Author: Litvin, IA ; Forbes, A Date: 2005 Bessel 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
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
Efficient sorting of Bessel beams [Conference paper]

Author: Mhlanga, T ; Dudley, Angela L ; McDonald, Andre M ; Roux, FS ; Lavery, M ; Padgett, M ; Forbes, A Date: Feb 2013 A 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
Generating and measuring non-diffracting vector Bessel beams

Author: Dudley, Angela L ; Lib, Y ; Mhlanga, T ; Escuti, M ; Forbes, A Date: Mar 2014 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 birefringent ... Read more
Generating and measuring nondiffracting vector Bessel beams

Author: Dudley, Angela L ; Li, Y ; Mhlanga, T ; Escuti, M ; Forbes, A Date: Sep 2013 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 only a spatial light ... Read more
Generating superpositions of higher–order Bessel beams [Journal article]

Author: Vasilyeu, R ; Dudley, Angela L ; Khilo, N ; Forbes, A Date: Dec 2009 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 with light which has ... Read more
Measurement of the orbital angular momentum density of light by modal decomposition

Author: Schulze, C ; Dudley, Angela L ; Flamm, D ; Duparre, M ; Forbes, A Date: Jul 2013 We 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
Measuring the orbital angular momentum density for a superposition of Bessel beams

Author: Dudley, Angela L ; Litvin, I ; Forbes, A Date: Jan 2012 To 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
Measuring the self-healing of the spatially inhomogeneous states of polarization of vector Bessel beams

Author: Milione, G ; Dudley, Angela L ; Nguyen, TA ; Chakraborty, O ; Karimi, E ; Forbes, A ; Alfano, R Date: Feb 2015 We 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
Poynting vector and orbital angular momentum density of superpositions of Bessel beams

Author: Litvin, IA ; Dudley, Angela L ; Forbes, A Date: Aug 2011 The 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
Propagation of high-order circularly polarized Bessel beams and vortex generation in uniaxial crystals

Author: Belyi, VN ; Khilo, NA ; Kazak, NS ; Ryzhevich, AA ; Forbes, A Date: May 2011 The 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
Putting light in a spin

Author: Dudley, Angela L ; Rop, R ; Litvin, IA ; Lopez-Mariscal, C ; Roux, FS ; Forbes, A Date: Aug 2012 We 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

Now showing items 1-20 of 30

Next Page

Browse

All of ResearchSpace

Quick Links

Legislation and compliance

General Enquiries

Tel: + 27 12 841 2911
Email: callcentre@csir.co.za

Physical Address
Meiring Naudé Road
Brummeria
Pretoria
South Africa

Postal Address
PO Box 395
Pretoria 0001
South Africa

Social Connect

Copyright © CSIR 2017. All Rights Reserved

Resources on this site are free to download and reuse according to associated licensing provision. Please read the terms and conditions of usage of each resource.