Subwavelength polarization optics via individual and coupled helical traveling-wave nanoantennas

Mengjia Wang; Roland Salut; Huihui Lu; Miguel-Angel Suarez; Nicolas Martin; Thierry Grosjean

doi:10.1038/s41377-019-0186-2

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Subwavelength polarization optics via individual and coupled helical traveling-wave nanoantennas

Article

- Subwavelength polarization optics via individual and coupled helical traveling-wave nanoantennas
- Light: Science & Applications Vol. 8, Issue 5, Pages: 758-765(2019)
- Affiliations：
  
  1.FEMTO-ST Institute UMR 6174, Univ. Bourgogne Franche-Comté CNRS, Besancon, France
  2.Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Department of Optoelectronic Engineering, Jinan University, Guangzhou 510632, China
- Author bio：
  
  Huihui Lu (thuihuilu@jnu.edu.cn)
  Thierry Grosjean (thierry.grosjean@univ-fcomte.fr)
- Funds：
- DOI：10.1038/s41377-019-0186-2
  CLC：
- Published：2019，
  
  Published Online：28 August 2019，
  
  Received：26 February 2019，
  
  Revised：07 July 2019，
  
  Accepted：30 July 2019
- Accepted：
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Wang, M. J. et al. Subwavelength polarization optics via individual and coupled helical traveling-wave nanoantennas. Light: Science & Applications, 8, 758-765 (2019).
DOI：

Wang, M. J. et al. Subwavelength polarization optics via individual and coupled helical traveling-wave nanoantennas. Light: Science & Applications, 8, 758-765 (2019). DOI： 10.1038/s41377-019-0186-2.

摘要

Abstract

Light polarization control is a key factor in modern photonics. Recent advances in surface plasmon manipulation have introduced the prospect of more compact and more efficient devices for this purpose. However

the current plasmonic-based polarization optics remain much larger than the wavelength of light

which limits the design degrees of freedom. Here

we present a plasmonic traveling-wave nanoantenna using a gold-coated helical carbon nanowire end-fired with a dipolar aperture nanoantenna. Our nonresonant helical nanoantenna enables tunable polarization control by swirling surface plasmons on the subwavelength scale and taking advantage of the optical spin–orbit interaction. Four closely packed helical traveling-wave nanoantennas (HTNs) are demonstrated to locally convert an incoming light beam into four beams of tunable polarizations and intensities

with the ability to impart different polarization states to the output beams in a controllable way. Moreover

by near-field coupling four HTNs of opposite handedness

we demonstrate a subwavelength waveplate-like structure providing a degree of freedom in polarization control that is unachievable with ordinary polarization optics and current metamaterials.

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Keywords

references

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