Optical control of the emission direction of a quantum dot

Journal Article · Mon Dec 09 00:00:00 EST 2013 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4845975· OSTI ID:22253852

Wasley, N. A.; Fox, A. M.; Skolnick, M. S. ^[1]; Ramsay, A. J. ^[2]; Thijssen, A. C. T.; Oulton, R. ^[3]; Hugues, M. ^[4]

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1. Department of Physics and Astronomy, University of Sheffield, Sheffield S3 7RH (United Kingdom)
2. Hitachi Cambridge Laboratory, Hitachi Europe Ltd, Cambridge CB3 OHE (United Kingdom)
3. H. H. Wills Physics Laboratory and Department of Electrical and Electronic Engineering, Tyndall Avenue, Bristol BS8 1TL (United Kingdom)
4. Department of Electronic and Electrical Engineering, University of Sheffield, Sheffield S1 3JD (United Kingdom)

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%.

• OSTI ID: 22253852
• Journal Information: Applied Physics Letters, Vol. 103, Issue 24; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CONTROL
EMISSION
EXCITATION
EXCITONS
GALLIUM ARSENIDES
INDIUM ARSENIDES
LASERS
PHOTONS
QUANTUM DOTS
SPIN ORIENTATION
VISIBLE RADIATION
WAVEGUIDES