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Title: Optical control of the emission direction of a quantum dot

Using the helicity of a non-resonant excitation laser, control over the emission direction of an InAs/GaAs quantum dot is demonstrated. The quantum dot is located off-center in a crossed-waveguide structure, such that photons of opposite circular polarization are emitted into opposite waveguide directions. By preferentially exciting spin-polarized excitons, the direction of emission can therefore be controlled. The directional control is quantified by using the ratio of the intensity of the light coupled into the two waveguides, which reaches a maximum of ±35%.
Authors:
 [1] ;  [2] ; ; ;  [3] ;  [4] ; ;  [5] ;  [6] ;  [7]
  1. College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter EX4 4QF (United Kingdom)
  2. (United Kingdom)
  3. Department of Physics and Astronomy, University of Sheffield, Sheffield S3 7RH (United Kingdom)
  4. Hitachi Cambridge Laboratory, Hitachi Europe Ltd, Cambridge CB3 OHE (United Kingdom)
  5. H. H. Wills Physics Laboratory and Department of Electrical and Electronic Engineering, Tyndall Avenue, Bristol BS8 1TL (United Kingdom)
  6. Department of Electronic and Electrical Engineering, University of Sheffield, Sheffield S1 3JD (United Kingdom)
  7. (France)
Publication Date:
OSTI Identifier:
22253852
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 103; Journal Issue: 24; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CONTROL; EMISSION; EXCITATION; EXCITONS; GALLIUM ARSENIDES; INDIUM ARSENIDES; LASERS; PHOTONS; QUANTUM DOTS; SPIN ORIENTATION; VISIBLE RADIATION; WAVEGUIDES