Pulse generation with ultra-superluminal pulse propagation in semiconductor heterostructures by superradiant-phase transition enhanced by transient coherent population gratings

Peter P Vasil'ev; Richard V Penty; Ian H White

doi:10.1038/lsa.2016.86

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Pulse generation with ultra-superluminal pulse propagation in semiconductor heterostructures by superradiant-phase transition enhanced by transient coherent population gratings

Original Articles

- Pulse generation with ultra-superluminal pulse propagation in semiconductor heterostructures by superradiant-phase transition enhanced by transient coherent population gratings
- Light: Science & Applications Vol. 5, Issue 3, (2016)
- Affiliations：
  
  1.Centre for Photonic Systems, Department of Engineering, University of Cambridge, Cambridge CB3 0FA, UK
  2.Quantum Electronics Division, PN Lebedev Physical Institute, Moscow 119991, Russia
- Author bio：
  
  PP Vasil'ev, Email: pv261@cam.ac.uk
- Funds：
- DOI：10.1038/lsa.2016.86
  CLC：
- Published：2016-09，
  
  Published Online：29 January 2016，
  
  Received：31 August 2015，
  
  Revised：22 January 2016，
  
  Accepted：27 January 2016
- Accepted：
Scan QR Code
Vasil'ev, P. P., Penty, R. V. & White, I. H. Pulse generation with ultra-superluminal pulse propagation in semiconductor heterostructures by superradiant-phase transition enhanced by transient coherent population gratings. Light: Science & Applications, 5, e16086 (2016).
DOI：

Vasil'ev, P. P., Penty, R. V. & White, I. H. Pulse generation with ultra-superluminal pulse propagation in semiconductor heterostructures by superradiant-phase transition enhanced by transient coherent population gratings. Light: Science & Applications, 5, e16086 (2016). DOI： 10.1038/lsa.2016.86.

摘要

Abstract

This paper reports the observation of ultra-superluminal pulse propagation in multiple-contact semiconductor heterostructures in a superradiant emission regime

and shows definitively that it is a different class of emission from conventional spontaneous or stimulated emission. Coherent population gratings induced in the semiconductor medium under strong electrical pumping have been shown to cause a major decrease of the group refractive index

in the range of 5–40%. This decrease is much greater than that caused by conventional carrier depletion or chirp mechanisms. The decrease in refractive index in turn causes faster-than-c propagation of femtosecond pulses. The measurement also proves the existence of coherent amplification of electromagnetic pulses in semiconductors at room temperature

the coherence being strongly enhanced by interactions of the light with coherent transient gratings locked to carrier gratings. This pulse-generation technique is anticipated to have great potential in applications where highly coherent femtosecond optical pulses must be generated on demand.

关键词

Keywords

phase transitionpopulation gratingsuperradiancesuperluminal propagation

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