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Rajasekharan R, Kewes G, Djalalian-Assl A, et al. Micro-concave waveguide antenna for high photon extraction from nitrogen vacancy centers in nanodiamond. Sci Rep. 2015;5:12013doi: 10.1038/srep12013.
Rajasekharan, R., Kewes, G., Djalalian-Assl, A., Ganesan, K., Tomljenovic-Hanic, S., McCallum, J. C., Roberts, A., Benson, O., & Prawer, S. (2015). Micro-concave waveguide antenna for high photon extraction from nitrogen vacancy centers in nanodiamond. Scientific reports, 512013. https://doi.org/10.1038/srep12013
Rajasekharan, Ranjith, et al. "Micro-concave waveguide antenna for high photon extraction from nitrogen vacancy centers in nanodiamond." Scientific reports vol. 5 (2015): 12013. doi: https://doi.org/10.1038/srep12013
Rajasekharan R, Kewes G, Djalalian-Assl A, Ganesan K, Tomljenovic-Hanic S, McCallum JC, Roberts A, Benson O, Prawer S. Micro-concave waveguide antenna for high photon extraction from nitrogen vacancy centers in nanodiamond. Sci Rep. 2015 Jul 14;5:12013. doi: 10.1038/srep12013. PMID: 26169682; PMCID: PMC4500948.
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Sci Rep. 2015 Jul 14;5:12013. doi: 10.1038/srep12013.

Micro-concave waveguide antenna for high photon extraction from nitrogen vacancy centers in nanodiamond.

Scientific reports

Ranjith Rajasekharan, Günter Kewes, Amir Djalalian-Assl, Kumaravelu Ganesan, Snjezana Tomljenovic-Hanic, Jeffrey C McCallum, Ann Roberts, Oliver Benson, Steven Prawer

Affiliations

  1. Department of Electrical and Electronic Engineering, The University of Melbourne, Melbourne, Victoria 3010 Australia.
  2. Nano-Optics, Institute of Physics, Humboldt-Universität zu Berlin, Newtonstraße 15, D-12489 Berlin, Germany.
  3. School of Physics, The University of Melbourne, Victoria 3010, Australia.

PMID: 26169682 PMCID: PMC4500948 DOI: 10.1038/srep12013

Abstract

The negatively charged nitrogen-vacancy colour center (NV(-) center) in nanodiamond is an excellent single photon source due to its stable photon generation in ambient conditions, optically addressable nuclear spin state, high quantum yield and its availability in nanometer sized crystals. In order to make practical devices using nanodiamond, highly efficient and directional emission of single photons in well-defined modes, either collimated into free space or waveguides are essential. This is a Herculean task as the photoluminescence of the NV centers is associated with two orthogonal dipoles arranged in a plane perpendicular to the NV defect symmetry axis. Here, we report on a micro-concave waveguide antenna design, which can effectively direct single photons from any emitter into either free space or into waveguides in a narrow cone angle with more than 80% collection efficiency irrespective of the dipole orientation. The device also enhances the spontaneous emission rate which further increases the number of photons available for collection. The waveguide antenna has potential applications in quantum cryptography, quantum computation, spectroscopy and metrology.

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