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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Terabit free-space data transmission employing orbital angular momentum multiplexing
Jian Wang,Jian Wang,Jeng-Yuan Yang,Irfan Fazal,Nisar Ahmed,Yan Yan,Hao Huang,Yongxiong Ren,Yang Yue,S. Dolinar,Moshe Tur,Alan E. Willner +11 more
TL;DR: In this paper, the authors demonstrate the ability to multiplex and transfer data between twisted beams of light with different amounts of orbital angular momentum, which provides new opportunities for increasing the data capacity of free-space optical communications links.
Journal ArticleDOI
Orbital angular momentum: origins, behavior and applications
Alison M. Yao,Miles J. Padgett +1 more
TL;DR: In this paper, it was shown that if every polarization vector rotates, the light has spin; if the phase structure rotates and if a light has orbital angular momentum (OAM), the light can be many times greater than the spin.
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Spin-orbit interactions of light
TL;DR: In this paper, the authors provide an overview of the fundamental origins and important applications of the main spin-orbit interaction phenomena in modern optics that play a crucial role at subwavelength scales, including spin-Hall effects in inhomogeneous media and at optical interfaces, spindependent effects in non-paraxial (focused or scattered) fields, spin-controlled shaping of light using anisotropic structured interfaces (metasurfaces).
Journal ArticleDOI
Advances in optical angular momentum
TL;DR: The concept of orbital angular momentum is now leading to new understanding of a wide range of phenomena, including fundamental processes in Bose-Einstein condensates, while the associated technologies have led to new applications in optical tweezing and microscopy as mentioned in this paper.
Journal ArticleDOI
Integrated Compact Optical Vortex Beam Emitters
Xinlun Cai,Jianwei Wang,Michael J. Strain,Benjamin Johnson-Morris,Jiangbo Zhu,Jiangbo Zhu,Marc Sorel,Jeremy L. O'Brien,Mark G. Thompson,Siyuan Yu,Siyuan Yu +10 more
TL;DR: Silicon-integrated optical vortex emitters are demonstrated, using angular gratings to extract light confined in whispering gallery modes with high OAM into free-space beams with well-controlled amounts of OAM, confirming the theoretical prediction that the emitted beams carry exactly defined and adjustable OAM.
References
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Journal ArticleDOI
Polarization of light and topological phases
TL;DR: In this article, a survey and analysis of recent work on topological phases with polarization of light is presented, which has revealed several counterintuitive features of such phase shifts such as 2 nπ anholonomies, nonlinear and discontinuous behaviour originating from high singularities, peculiar spectral dependence, etc.
Journal ArticleDOI
Collective rotation of molecules driven by the angular momentum of light in a nematic film.
TL;DR: In this paper, it was shown that a circularly polarized laser beam normally incident on a homeotropically aligned nematic film can induce a collective precession of the molecules in the film if the laser intensity is above the threshold for the Freedericksz transition.
Journal ArticleDOI
Sur le moment d'impulsion d'une onde électromagnétique
TL;DR: In this article, the angular momentum of the electromagnetic radiation in three terms has been studied; two of these terms present a formal resemblance with an orbital momentum and a spin-momentum, respectively; the third one is a surface term, which has often been wrongly neglected.
Journal ArticleDOI
Spiral phase elements obtained by use of discrete space-variant subwavelength gratings
TL;DR: In this paper, the formation of spiral phase elements producing helical beams with different topological charges is presented, which consist of discrete space-variant subwavelength dielectric gratings.
Journal ArticleDOI
Self-induced stimulated light scattering in nematic liquid crystals: Theory and experiment.
TL;DR: The model is accurate enough to obtain quantitative agreement with experimental results, including the observation of optical bistability and hysteresis, and exact plane-wave expressions for energy and angular-momentum exchange between light and matter are derived.