Stuttgart 2012 – wissenschaftliches Programm
Q 36.4: Vortrag
Donnerstag, 15. März 2012, 11:45–12:00, V47.01
Highly efficient, fibre-integrated single photon to single mode coupling - based on defect centres in nanodiamonds — •Tim Schröder1, Masazumi Fujiwara2, Tetsuya Noda2, Hong-Quan Zhao2, Oliver Benson1, and Shigeki Takeuchi2 — 1Nano-Optics, Humboldt University — 2RIES, Hokkaido University, Japan
Recently, the most direct approach to fabricate a reliable single photon source, by mounting a single quantum emitter on an optical fibre, was demonstrated*. A nanodiamond containing a single nitrogen vacancy (NV) centre was placed on the fibre facet. Such a system easily integrates into fibre optic networks for quantum cryptography and is promising for quantum metrology applications.
Here, we present a tapered fibre based single photon system that has an even wider application range. Single nanodiamonds containing NV centres are deposited on such a tapered fibre of 273 nm in diameter. The tapered fibres were fabricated from standard single mode fibres. For the deposition on the taper, a dip-coating technique was developed, that enables controlled deposition of nanodiamonds and other nanoparticles. For a single NV centre, 689 kcts/s of single photons are coupled into a single mode. The system was cooled to cryogenic temperatures and can be coupled evanescently to other nanophotonic structures, such as microresonators. It is suitable for integrated quantum transmission experiments, two-photon interference, quantum-random-number generation. As a nanoprobe it can be used for well localized, ultra-sensitive sensing applications such as nano-magnetometry.
* Schroeder et al. Nano Letters 11, 198, 2011