Spiniform phase-encoded metagratings entangling arbitrary rational-order orbital angular momentum

Huang, K., Liu, H., Restuccia, S. , Mehmood, M. Q., Mei, S.-T., Giovannini, D., Danner, A., Padgett, M. J. , Teng, J.-H. and Qiu, C.-W. (2018) Spiniform phase-encoded metagratings entangling arbitrary rational-order orbital angular momentum. Light: Science and Applications, 7, 17156. (doi: 10.1038/lsa.2017.156)

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Quantum entanglements between integer-order and fractional-order orbital angular momentums (OAMs) have been previously discussed. However, the entangled nature of arbitrary rational-order OAM has long been considered a myth due to the absence of an effective strategy for generating arbitrary rational-order OAM beams. Therefore, we report a single metadevice comprising a bilaterally symmetric grating with an aperture, creating optical beams with dynamically controllable OAM values that are continuously varying over a rational range. Due to its encoded spiniform phase, this novel metagrating enables the production of an average OAM that can be increased without a theoretical limit by embracing distributed singularities, which differs significantly from the classic method of stacking phase singularities using fork gratings. This new method makes it possible to probe the unexplored niche of quantum entanglement between arbitrarily defined OAMs in light, which could lead to the complex manipulation of microparticles, high-dimensional quantum entanglement and optical communication. We show that quantum coincidence based on rational-order OAM-superposition states could give rise to low cross-talks between two different states that have no significant overlap in their spiral spectra. Additionally, future applications in quantum communication and optical micromanipulation may be found.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Padgett, Professor Miles and Restuccia, Ms Sara and Danner, Mr Aaron and Giovannini, Dr Daniel
Authors: Huang, K., Liu, H., Restuccia, S., Mehmood, M. Q., Mei, S.-T., Giovannini, D., Danner, A., Padgett, M. J., Teng, J.-H., and Qiu, C.-W.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Light: Science and Applications
Publisher:Nature Publishing Group
ISSN (Online):2047-7538
Published Online:16 November 2017
Copyright Holders:Copyright © 2018 The Authors
First Published:First published in Light: Science and Applications 7:17156
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
624501TWISTS - Twists & more: the complex shape of lightMiles PadgettEuropean Research Council (ERC)340507S&E P&A - PHYSICS & ASTRONOMY