Generating optical orbital angular momentum at visible wavelengths using a plasmonic metasurface

Ebrahim Karimi; Sebastian A Schulz; Israel De Leon; Hammam Qassim; Jeremy Upham; Robert W Boyd

doi:10.1038/lsa.2014.48

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Generating optical orbital angular momentum at visible wavelengths using a plasmonic metasurface

Original Articles

- Generating optical orbital angular momentum at visible wavelengths using a plasmonic metasurface
- Light: Science & Applications Vol. 3, Issue 2, (2014)
- Affiliations：
  
  1.Department of Physics, University of Ottawa, Ottawa, Ont. K1N 6N5, Canada
  2.Institute of Optics, University of Rochester, Rochester, NY 14627, USA
- Author bio：
  
  Dr E Karimi, Department of Physics, University of Ottawa, 150 Louis Pasteur, Ottawa, Ont. K1N 6N5, Canada Email: ekarimi@uottawa.ca
- Funds：
- DOI：10.1038/lsa.2014.48
  CLC：
- Published：2014-06，
  
  Published Online：09 May 2014，
  
  Received：21 November 2013，
  
  Revised：16 January 2014，
  
  Accepted：19 January 2014
- Accepted：
Scan QR Code
Karimi, E. et al. Generating optical orbital angular momentum at visible wavelengths using a plasmonic metasurface. Light: Science & Applications, 3, e167 (2014).
DOI：

Karimi, E. et al. Generating optical orbital angular momentum at visible wavelengths using a plasmonic metasurface. Light: Science & Applications, 3, e167 (2014). DOI： 10.1038/lsa.2014.48.

摘要

Abstract

Light beams with a helical phase-front possess orbital angular momentum along their direction of propagation in addition to the spin angular momentum that describes their polarisation. Until recently

it was thought that these two 'rotational' motions of light were largely independent and could not be coupled during light–matter interactions. However

it is now known that interactions with carefully designed complex media can result in spin-to-orbit coupling

where a change of the spin angular momentum will modify the orbital angular momentum and

vice versa

. In this work

we propose and demonstrate that the birefringence of plasmonic nanostructures can be wielded to transform circularly polarised light into light carrying orbital angular momentum. A device operating at visible wavelengths is designed from a space-variant array of subwavelength plasmonic nano-antennas. Experiment confirms that circularly polarised light transmitted through the device is imbued with orbital angular momentum of ±2

(with conversion efficiency of at least 1%). This technology paves the way towards ultrathin orbital angular momentum generators that could be integrated into applications for spectroscopy

nanoscale sensing and classical or quantum communications using integrated photonic devices.

关键词

Keywords

light orbital angular momentumlight spin angular momentumplasmonic metasurface

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