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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Far-field measurements of vortex beams interacting with nanoholes.
TL;DR: Interestingly, vortex beams enhance the γm,p ratio as compared to those obtained by Gaussian beams, and this ratio is highly dependent on the helicity (p) and the angular momentum of the incident vortex beam in consideration.
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Optical vortex coronagraphy with an elliptical aperture
TL;DR: An optical vortex coronagraph that makes efficient use of a larger fraction of the clear aperture of a Cassegrain-type telescope is described, and a new vortex phase mask is derived that maintains the same theoretical contrast of a circularly symmetric Vortex coronagraph.
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Wavelength-selective orbital angular momentum generation based on a plasmonic metasurface.
TL;DR: The agreement between the simulated and measured results suggests that the metasurface of wavelength-selective OAM modes may have potential applications in future optical communication systems.
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Ptychographic amplitude and phase reconstruction of bichromatic vortex beams
Yuka Esashi,Chen-Ting Liao,Bin Wang,Nathan J. Brooks,Kevin M. Dorney,Carlos Hernandez-Garcia,Henry C. Kapteyn,Daniel E. Adams,Margaret M. Murnane +8 more
TL;DR: It is experimentally demonstrate that ptychographic coherent diffractive imaging can be used to simultaneously characterize the amplitude and phase of bichromatic orbital angular momenta-shaped vortex beams, which consist of a fundamental field, together with its copropagating second-harmonic field.
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Frontiers of light manipulation in natural, metallic, and dielectric nanostructures
E. De Tommasi,Emanuela Esposito,Silvia Romano,Alessio Crescitelli,V. Di Meo,Vito Mocella,Gianluigi Zito,I. Rendina +7 more
TL;DR: In this article, the main properties and applications of cutting-edge nanostructures starting from several examples of natural photonic architectures, up to the most recent technologies based on metallic and dielectric metasurfaces.
References
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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
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Direct Observation of Transfer of Angular Momentum to Absorptive Particles from a Laser Beam with a Phase Singularity
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