Ultrafast control of fractional orbital angular momentum of microlaser emissions

Zhifeng Zhang; Haoqi Zhao; Danilo Gomes Pires; Xingdu Qiao; Zihe Gao; Josep M. Jornet; Stefano Longhi; Natalia M. Litchinitser; Liang Feng

doi:10.1038/s41377-020-00415-3

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Ultrafast control of fractional orbital angular momentum of microlaser emissions

Original Articles

- Ultrafast control of fractional orbital angular momentum of microlaser emissions
- Light: Science & Applications Vol. 9, Issue 6, Pages: 1878-1886(2020)
- Affiliations：
  
  1.Department of Electrical and Systems Engineering, University of Pennsylvania, Philadelphia, PA 19104, USA
  2.Department of Electrical and Computer Engineering, Duke University, Durham, NC 27708, USA
  3.Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, PA 19104, USA
  4.Department of Electrical and Computer Engineering, Northeastern University, Boston, MA 02115, USA
  5.Dipartimento di Fisica, Politecnico di Milano and Istituto di Fotonica e Nanotecnologie del Consiglio Nazionale delle Ricerche, Piazza L. da Vinci 32, I-20133 Milano, Italy
  6.Instituto de Fisica Interdisciplinar y Sistemas Complejos IFISC (CSIC-UIB), Palma de Mallorca, Spain
- Author bio：
  
  Liang Feng (fenglia@seas.upenn.edu)
- Funds：
- DOI：10.1038/s41377-020-00415-3
  CLC：
- Published：2020，
  
  Published Online：21 October 2020，
  
  Received：12 August 2020，
  
  Revised：28 September 2020，
  
  Accepted：29 September 2020
- Accepted：
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Zhang, Z. F. et al. Ultrafast control of fractional orbital angular momentum of microlaser emissions. Light: Science & Applications, 9, 1878-1886 (2020).
DOI：

Zhang, Z. F. et al. Ultrafast control of fractional orbital angular momentum of microlaser emissions. Light: Science & Applications, 9, 1878-1886 (2020). DOI： 10.1038/s41377-020-00415-3.

摘要

Abstract

On-chip integrated laser sources of structured light carrying fractional orbital angular momentum (FOAM) are highly desirable for the forefront development of optical communication and quantum information–processing technologies. While integrated vortex beam generators have been previously demonstrated in different optical settings

ultrafast control and sweep of FOAM light with low-power control

suitable for high-speed optical communication and computing

remains challenging. Here we demonstrate fast control of the FOAM from a vortex semiconductor microlaser based on fast transient mixing of integer laser vorticities induced by a control pulse. A continuous FOAM sweep between charge 0 and charge +2 is demonstrated in a 100 ps time window

with the ultimate speed limit being established by the carrier recombination time in the gain medium. Our results provide a new route to generating vortex microlasers carrying FOAM that are switchable at GHz frequencies by an ultrafast control pulse.

关键词

Keywords

references

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