Solid-state single photon sources: light collection strategies |
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Authors: | WL Barnes G Björk JM Gérard P Jonsson JAE Wasey PT Worthing V Zwiller |
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Institution: | (1) Thin Film Photonics Group, School of Physics, University of Exeter, Exeter, EX4 4QL, UK, GB;(2) Dept. of Microelectronics and Information Technology, KTH Electrum 229, 16440 Kista, Sweden, SE;(3) CNRS/LPN, 196 avenue Henri Ravera, B.P. 29, 92222 Bagneux Cedex, France, FR;(4) Dept. of Solid State Physics, Lund University, 22100 Lund, Sweden, SE |
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Abstract: | We examine the problem of efficiently collecting the photons produced by solid-state single photon sources. The extent of
the problem is first established with the aid of simple physical concepts. Several approaches to improving the collection
efficiency are then examined and are broadly categorized into two types. First are those based on cavity quantum dynamics,
in which the pathways by which the source may emit a photon are restricted, thus channeling emission into one desired mode.
Second are those where we try to reshape the free space modes into a target mode in an optimal way, by means of refraction,
without fundamentally altering the way in which the source emits. Respectively, we examine a variety of microcavities and
solid immersion lenses. Whilst we find that the micropillar microcavities offer the highest collection efficiency (∼70%),
choosing this approach may not always be appropriate due to other constraints. Details of the different approaches, their
merits and drawbacks are discussed in detail.
Received 19 July 2001 and Received in final form 5 October 2001 |
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Keywords: | PACS 03 67 Dd Quantum cryptography – 42 79 Gn Optical waveguides and couplers – 12 20 -m Quantum electrodynamics |
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