Optical spin-to-orbital angular momentum conversion in inhomogeneous anisotropic media
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TLDR
An optical process in which the spin angular momentum carried by a circularly polarized light beam is converted into orbital angular momentum, leading to the generation of helical modes with a wave-front helicity controlled by the input polarization is demonstrated.Abstract:
We demonstrate experimentally an optical process in which the spin angular momentum carried by a circularly polarized light beam is converted into orbital angular momentum, leading to the generation of helical modes with a wave-front helicity controlled by the input polarization. This phenomenon requires the interaction of light with matter that is both optically inhomogeneous and anisotropic. The underlying physics is also associated with the so-called Pancharatnam-Berry geometrical phases involved in any inhomogeneous transformation of the optical polarization.read more
Citations
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Limitations to the determination of a Laguerre–Gauss spectrum via projective, phase-flattening measurement
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TL;DR: In this article, the authors studied the efficiency of the orbital angular momentum (OAM) component of a light beam and showed that even for low values of the OAM, a large amount of light can fall outside the fundamental mode of the optical fiber, and quantified the losses as functions of the waist of the coupling beam of OAM and radial indices.
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Guiding light via geometric phases
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TL;DR: In this article, a mechanism for confining and guiding light that relies on spin-orbit interactions of light is presented, which is based on the spin interaction of light and the spin spin.
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Liquid-Crystal-Mediated Geometric Phase: From Transmissive to Broadband Reflective Planar Optics
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Generation of arbitrary vector beams with liquid crystal polarization converters and vector-photoaligned q-plates
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High-speed spatial control of the intensity, phase and polarisation of vector beams using a digital micro-mirror device
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References
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TL;DR: In this paper, the authors define an order parameter statistical theories of the nematic order phenomonological description of the nematic-isotopic mixtures and describe the properties of these mixtures.
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Orbital angular momentum of light and the transformation of Laguerre-Gaussian laser modes.
TL;DR: Laser light with a Laguerre-Gaussian amplitude distribution is found to have a well-defined orbital angular momentum and an astigmatic optical system may be used to transform a high-order LaguERre- Gaussian mode into aHigh-order Hermite-Gaussia mode reversibly.
Journal ArticleDOI
Free-space information transfer using light beams carrying orbital angular momentum
Graham M. Gibson,Johannes Courtial,Miles J. Padgett,Mikhail V. Vasnetsov,V. A. Pas’ko,Stephen M. Barnett,Sonja Franke-Arnold +6 more
TL;DR: The transfer of information encoded as orbital angular momentum states of a light beam is demonstrated, which is resistant to eavesdropping and gives an experimental insight into the effects of aperturing and misalignment of the beam on the OAM measurement and demonstrates the uncertainty relationship for OAM.
Journal ArticleDOI
Dislocations in wave trains
John F. Nye,Michael V Berry +1 more
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Direct Observation of Transfer of Angular Momentum to Absorptive Particles from a Laser Beam with a Phase Singularity
TL;DR: Black or reflective particles can be trapped in the dark central minimum of a doughnut laser beam produced using a high efficiency computer generated hologram to carry angular momentum transferred from the central phase singularity beam.