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Browsing by Subject "OAM"

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Free-space communication with spatial modes of light

Author: Gailele, Lucas M ; Dudley, Angela L ; Forbes, A Date: Sep 2018 Current communication systems make use of polarization and wavelength multiplexing to increase transmission rates. To offer a further improvement, Orbital Angular Momentum (OAM) modes (or Laguerre-Gaussian modes) provide an infinite dimensional ... Read more
Free-space data transfer using the spatial modes of light

Author: Gailele, Lucas M ; Dudley, Angela L ; Ndagano, B ; McLaren M, M ; Rosales, C ; Forbes, A Date: Jul 2016 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 in bandwith. However ... Read more
Is long distance free space quantum communication with the OAM state of light feasible [Presentation]

Author: Hamadou Ibrahim, A ; Roux, FS ; McLaren, M ; Forbes, A ; Konrad, T Date: Jun 2013 This is a power point presentation questioning the feasablility of free space quantum communication with the OAM state of light. Presented June 2013 Read more
Measurement of the orbital angular momentum density of Bessel beams by projection into a Laguerre–Gaussian basis

Author: Schulze, C ; Dudley, Angela L ; Brüning, R ; Duparré, M ; Forbes, A Date: Sep 2014 We present the measurement of the orbital angular momentum (OAM) density of Bessel beams and superpositions thereof by projection into a Laguerre–Gaussian basis. This projection is performed by an all-optical inner product measurement performed ... 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
Optical communication beyond orbital angular momentum

Author: Trichili, A ; Rosales-Guzmán, C ; Dudley, Angela L ; Ndagano, B ; Salem, AB ; Zghal, M ; Forbes, A Date: Jun 2016 Mode division multiplexing (MDM) is mooted as a technology to address future bandwidth issues, and has been successfully demonstrated in free space using spatial modes with orbital angular momentum (OAM). To further increase the data transmission ... Read more
Orbital angular momentum correlations with a phase-flipped Gaussian mode pump beam

Author: Romero, J ; Giovannini, D ; McLaren, MG ; Galvez, EJ ; Forbes, A ; Padgett, MJ Date: Aug 2012 We report orbital angular momentum (OAM) and angle correlations between signal and idler photons observed when the nonlinear crystal used in spontaneous parametric down-conversion is illuminated by a non-fundamental Gaussian pump beam. We ... Read more
Parameter dependence in the atmospheric decoherence of modal entangled photon pairs

Author: Ibrahim, AH ; Roux, FS ; Konrad, T Date: Nov 2014 When a pair of photons that are entangled in terms of their transverse modes, such as an orbital angular momentum (OAM) basis, propagates through atmospheric turbulence, the scintillation causes a decay of the entanglement. Here, we use ... Read more
Propagation of orbital angular momentum carrying beams through a perturbing medium

Author: Chaibi, A ; Mafusire, C ; Forbes, A Date: Sep 2013 The orbital angular momentum of light has been suggested as a means of information transfer over free-space, yet the detected optical vortex is known to be sensitive to perturbation. Such effects have been studied theoretically, in particular ... Read more
Quantitative measurement of the orbital angular momentum density of light

Author: Dudley, Angela L ; Litvin, IA ; Forbes, A Date: Mar 2012 In 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
Quantitatively measuring the orbital angular momentum density of light : Presentation

Author: Dudley, Angela L ; Schulze, C ; Litvin, I ; Duparré, M ; Forbes, A Date: Aug 2013 Although 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
Qudit-Teleportation for photons with linear optics

Author: Goyal, SK ; Boukama-Dzoussi, PE ; Ghosh, S ; Roux, FS ; Konrad, T Date: Apr 2014 Quantum teleportation, the transfer of the state of one quantum system to another without direct interaction between both systems, is an important way to transmit information encoded in quantum states and to generate quantum correlations ... Read more
Radial modal dependence of the azimuthal spectrum after parametric down-conversion

Author: Zhang, Y ; Roux, FX ; McLaren, M ; Forbes, A Date: 2014 The radial degrees of freedom of the biphoton states that are produced in spontaneous parametric down-conversion (SPDC) in the Laguerre-Gaussian (LG) basis are investigated, theoretically and experimentally. We calculated the theoretical ... Read more
Self-healing of quantum entanglement after an obstruction

Author: McLaren, M ; Mhlanga, T ; Padgett, MJ ; Roux, FS ; Forbes, A Date: Feb 2014 Quantum 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
Superpositions of light fields carrying orbital angular momentum

Author: Dudley, Angela L Date: Jan 2012 The 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
Two-photon optics of Bessel-Gaussian modes

Author: McLaren, M ; Romero, J ; Padgett, MJ ; Roux, FS ; Forbes, A Date: Sep 2013 In this paper we consider geometrical two-photon optics of Bessel-Gaussian modes generated in spontaneous parametric down-conversion of a Gaussian pump beam. We provide a general theoretical expression for the orbital angular momentum (OAM) ... Read more
Vector-mode decay in atmospheric turbulence: An analysis inspired by quantum mechanics

Author: Nape, I ; Mashaba, Nikiwe P ; Mphuthi, N ; Jayakumar, S ; Bhattacharya, S ; Forbes, Andrew Date: Mar 2021 Vector beams are inhomogeneously polarized optical fields with nonseparable, quantum-like correlations between their polarization and spatial components, and hold tremendous promise for classical and quantum communication across various ... Read more
What's all this about entanglement?

Author: Roux, FS Date: Feb 2015 This report present the presentation on what's all this about entanglement? Read more

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