P Atkinson

Publications (2)7.17 Total impact

• Article: Influence of exciton dynamics on the interference of two photons from a microcavity single-photon source.

  A Bennett, D Unitt, A Shields, P Atkinson, D Ritchie
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  ABSTRACT: One- and two-photon interference visibilities observed with the exciton emission from a quantum dot microcavity single-photon source are sensitive to the excitation conditions. In particular, the coherence time of the source is reduced with increasing pump power or excitation of the barrier layers. Furthermore, the two-photon interference visibility is affected by a long lived population of the biexciton state in the dot. This suggests that two-photon interference may be improved by controlling the exciton dynamics in the dot or by improved temporal resolution of the detection set-up.
  Optics Express 11/2005; 13(20):7772-8. · 3.59 Impact Factor
• Article: High performance single photon sources from photolithographically defined pillar microcavities.

  A Bennett, D Unitt, P Atkinson, D Ritchie, A Shields
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  ABSTRACT: We demonstrate that single photons can be generated from single InAs/GaAs quantum dots in photolithographically defined pillar microcavities. Pillars with a 1.9 microm diameter cavity show a four fold enhancement in the radiative decay rate due to the Purcell effect and a photon collection efficiency into a lens of up to 10%. Measurements of the second order correlation function reveal a greater than fifty fold reduction in the multi-photon emission rate compared to a laser of the same intensity.
  Optics Express 02/2005; 13(1):50-5. · 3.59 Impact Factor