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

Kun Huang; Hong Liu; Sara Restuccia; Muhammad Q Mehmood; Sheng-Tao Mei; Daniel Giovannini; Aaron Danner; Miles J Padgett; Jing-Hua Teng; Cheng-Wei Qiu

doi:10.1038/lsa.2017.156

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

Original Articles

- Spiniform phase-encoded metagratings entangling arbitrary rational-order orbital angular momentum
- Light: Science & Applications Vol. 7, Issue 2, (2018)
- Affiliations：
  
  1.Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117583, Singapore
  2.Institute of Materials Research and Engineering, Agency for Science, Technology and Research, Singapore 138634, Singapore
  3.Department of Optics and Optical Engineering, University of Science and Technology of China, Hefei 230026, China
  4.SUPA, School of Physics and Astronomy, University of Glasgow, Glasgow G128QQ, UK
  5.Information Technology University of the Punjab, Lahore 54000, Pakistan
  6.NUS Graduate School for Integrative Science and Engineering, National University of Singapore, Singapore 117456, Singapore
  7.The Edward S Rogers Department of Electrical and Computer Engineering, University of Toronto, Toronto M5S 3G4, Canada
  8.SZU-NUS Collaborative Innovation Center for Optoelectronic Science and Technology, Shenzhen University, Shenzhen 518060, China
  9.NUS Suzhou Research Institute (NUSRI), Suzhou 215123, China
- Author bio：
  
  JH Teng, Email: jh-teng@imre.a-star.edu.sg
  CW Qiu, Email: eleqc@nus.edu.sg
- Funds：
- DOI：10.1038/lsa.2017.156
  CLC：
- Published：2018，
  
  Published Online：09 March 2018，
  
  Received：12 May 2017，
  
  Revised：09 November 2017，
  
  Accepted：09 November 2017
- Accepted：
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Huang, K. et al. Spiniform phase-encoded metagratings entangling arbitrary rational-order orbital angular momentum. Light: Science & Applications, 7, 17156 (2018).
DOI：

Huang, K. et al. Spiniform phase-encoded metagratings entangling arbitrary rational-order orbital angular momentum. Light: Science & Applications, 7, 17156 (2018). DOI： 10.1038/lsa.2017.156.

摘要

Abstract

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.

关键词

Keywords

metasurfacenanophotonicsorbital angular momentumsuperposition state

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