Optical control of the emission direction of a quantum dot

Isaac Luxmoore, Nicholas A Wasley, Andrew J. Ramsay, Ruth Oulton, Andrew Ramsay, Arthur C T Thijssen, Maxime Hughes, A. Mark Fox, Maurice Skolnick

Research output: Contribution to journalArticle (Academic Journal)peer-review

21 Citations (Scopus)

Abstract

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%.
Original languageEnglish
Article number1.4845975
Pages (from-to)241102
Number of pages3
JournalApplied Physics Letters
Volume103
Issue number24
DOIs
Publication statusPublished - 9 Dec 2013

Keywords

  • quantum dot
  • spin
  • nanophotonics

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