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ROOM TEMPERATURE POLARIZED SINGLE PHOTON SOURCE WITH A COLLOIDAL DOT IN ROD.

ROOM TEMPERATURE POLARIZED SINGLE PHOTON SOURCE WITH A COLLOIDAL DOT IN ROD. Godefroy Leménager 1 , F Pisanello 1,2 , L Martiradonna 3 , P Spinicelli 1 , A Fiore 2 , J-P Hermier 4 , L Manna 5 , R Cingolani 2,3 , E Giacobino 1 , M De Vittorio 2,3 and A Bramati 1

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ROOM TEMPERATURE POLARIZED SINGLE PHOTON SOURCE WITH A COLLOIDAL DOT IN ROD.

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  1. ROOM TEMPERATURE POLARIZED SINGLE PHOTON SOURCE WITH A COLLOIDAL DOT IN ROD. Godefroy Leménager1, F Pisanello1,2, L Martiradonna3, P Spinicelli1, A Fiore2, J-P Hermier4, L Manna5, R Cingolani2,3, E Giacobino1, M De Vittorio2,3 and A Bramati1 1 Laboratoire Kastler Brossel, Paris, France. 2 National Nanotechnology Laboratory, Lecce, Italy. 3 Istituto Italiano di Tecnologia, Arnesano (Lecce). 4 Groupe d'étude de la Matière Condensée, Versailles, France. 5 Istituto Italiano di Tecnologia, Genova. lemenager@spectro.jussieu.fr PLMCN 10, 12/16 avril 2010 Cuernavaca

  2. G. Leménager : ROOM TEMPERATURE POLARIZED SINGLE PHOTON SOURCE WITH A COLLOIDAL DOT IN ROD. Why single photon sources? Quantum Information Quantum computation Quantum error corrections Quantum cryptography Several keys distribution algorithms are based on photon polarization, such as BB84 or B92 Bennett and Brassard, Int. Conf. on Computers, Systems and Signal Processing, India, December 10–12, 1984, p. 175. Polarized single photon sources are usually needed PLMCN 10, 12/16 avril 2010 Cuernavaca

  3. G. Leménager : ROOM TEMPERATURE POLARIZED SINGLE PHOTON SOURCE WITH A COLLOIDAL DOT IN ROD. Why single emitter florescence for single photon sources? Laser Attenuated laser Pulsed Laser hν > Ec-Ev Ec-Ev Single emitter florescence PLMCN 10, 12/16 avril 2010 Cuernavaca

  4. Epitaxial growth SPSs G. Leménager : ROOM TEMPERATURE POLARIZED SINGLE PHOTON SOURCE WITH A COLLOIDAL DOT IN ROD. Epitaxial or colloidal artificial atoms? Colloidal SPSs [2] • Stranski-Krastanow growth • Metal-Organic Chemical Vapor Deposition (MOCVD) /Molecular Beam Epitaxy (MBE) • efficient electrical injection by p-n doping of the surrounding heterostructure • Expensive techniques required • Room-temperature emission from single QD difficult to be achieved due to phonons energy comparable with allowed energy levels distance • Higher distance among allowed energy states in conduction and valence bands: intense emission also at room temperature • Broad tunable emission range • Low costs and versatile synthesis procedures • Blinking • Not collimated and not polarized emission Y. Arakawa et al., Nat. Mat.5, 887 (2006). A. Tribu et al., Nano Lett.8, 4326 (2008). P. Michler et al., Nature406, 968 (2000). PLMCN 10, 12/16 avril 2010 Cuernavaca

  5. High quantum yield Increasing spontaneous emission rate Shell Core CdS CdS CdSe CdSe G. Leménager : ROOM TEMPERATURE POLARIZED SINGLE PHOTON SOURCE WITH A COLLOIDAL DOT IN ROD. Colloidal Nanocrystals Engineering Linear Dipole Moment Blinking suppression A. Qualtieri et al., New J. Phys 11, 033025 (2009). B. Malher et al., Nature Mat.7, 659 (2008). PLMCN 10, 12/16 avril 2010 Cuernavaca

  6. G. Leménager : ROOM TEMPERATURE POLARIZED SINGLE PHOTON SOURCE WITH A COLLOIDAL DOT IN ROD. Increasing spontaneous emission rate • Nanocristals not in the cavity • Nanocristals in the cavity Antonio Qualtieri et al 2009 New J. Phys. 11 033025 PLMCN 10, 12/16 avril 2010 Cuernavaca

  7. High quantum yield Increasing spontaneous emission rate Shell Core CdS CdSe G. Leménager : ROOM TEMPERATURE POLARIZED SINGLE PHOTON SOURCE WITH A COLLOIDAL DOT IN ROD. Colloidal Nanocrystals Engineering Linear Dipole Moment Blinking suppression CdS A. Qualtieri et al., New J. Phys 11, 033025 (2009). B. Malher et al., Nature Mat.7, 659 (2008). CdSe PLMCN 10, 12/16 avril 2010 Cuernavaca

  8. G. Leménager : ROOM TEMPERATURE POLARIZED SINGLE PHOTON SOURCE WITH A COLLOIDAL DOT IN ROD. Seeded growth colloidal dot in a rod Carbone et al., Nano Letters7, 2942 (2007). HRTEM Images PLMCN 10, 12/16 avril 2010 Cuernavaca

  9. G. Leménager : ROOM TEMPERATURE POLARIZED SINGLE PHOTON SOURCE WITH A COLLOIDAL DOT IN ROD. How to characterize a polarized single photon source? Picoseconds pulsed laser =404nm Acquisition card Coincidences histogram Delay between photons and laser pulse Emission = 595nm l/2 plate Polarized Hanbury Brown and Twiss interferometer PLMCN 10, 12/16 avril 2010 Cuernavaca

  10. G. Leménager : ROOM TEMPERATURE POLARIZED SINGLE PHOTON SOURCE WITH A COLLOIDAL DOT IN ROD. Luminescence topography y 5um 15 000 [photons/s] 0 0 x 0 5um PLMCN 10, 12/16 avril 2010 Cuernavaca

  11. G. Leménager : ROOM TEMPERATURE POLARIZED SINGLE PHOTON SOURCE WITH A COLLOIDAL DOT IN ROD. Single photon source ? F. Pisanello et al., Appl. Phys. Let. 96, 033101 (2010) F. Pisanello et al., Superlattices and Microstructures 47, 165 (2009) PLMCN 10, 12/16 avril 2010 Cuernavaca

  12. G. Leménager : ROOM TEMPERATURE POLARIZED SINGLE PHOTON SOURCE WITH A COLLOIDAL DOT IN ROD. Photoluminescence intensity 0 5 10 15 20 PLMCN 10, 12/16 avril 2010 Cuernavaca

  13. θ=90° θ=0° G. Leménager : ROOM TEMPERATURE POLARIZED SINGLE PHOTON SOURCE WITH A COLLOIDAL DOT IN ROD. Photoluminescence intensity 0 5 10 15 20 PLMCN 10, 12/16 avril 2010 Cuernavaca

  14. G. Leménager : ROOM TEMPERATURE POLARIZED SINGLE PHOTON SOURCE WITH A COLLOIDAL DOT IN ROD. Properties of the polarized emission F. Pisanello et al., Appl. Phys. Let. 96, 033101 (2010) PLMCN 10, 12/16 avril 2010 Cuernavaca

  15. G. Leménager : ROOM TEMPERATURE POLARIZED SINGLE PHOTON SOURCE WITH A COLLOIDAL DOT IN ROD. Orientation of the Dot in Rod Omnidirectional Emitter Focus Dipole like Emitter X. Brokman Phd Thesis UPMC (2004) PLMCN 10, 12/16 avril 2010 Cuernavaca

  16. G. Leménager : ROOM TEMPERATURE POLARIZED SINGLE PHOTON SOURCE WITH A COLLOIDAL DOT IN ROD. Orientation of the Dot in Rod Focalised picture Defocalised picture F. Pisanello et al., Appl. Phys. Let. 96, 033101 (2010) PLMCN 10, 12/16 avril 2010 Cuernavaca

  17. G. Leménager : ROOM TEMPERATURE POLARIZED SINGLE PHOTON SOURCE WITH A COLLOIDAL DOT IN ROD. Orientation of the Dot in Rod F. Pisanello et al., Appl. Phys. Let. 96, 033101 (2010) PLMCN 10, 12/16 avril 2010 Cuernavaca

  18. G. Leménager : ROOM TEMPERATURE POLARIZED SINGLE PHOTON SOURCE WITH A COLLOIDAL DOT IN ROD. Device PLMCN 10, 12/16 avril 2010 Cuernavaca

  19. E E G. Leménager : ROOM TEMPERATURE POLARIZED SINGLE PHOTON SOURCE WITH A COLLOIDAL DOT IN ROD. Device L Carbone et al. Nano Lett., 2007, 7 (10), pp 2942–2950 PLMCN 10, 12/16 avril 2010 Cuernavaca

  20. G. Leménager : ROOM TEMPERATURE POLARIZED SINGLE PHOTON SOURCE WITH A COLLOIDAL DOT IN ROD. Conclusion • The polarization properties of a single, isolated dot in rod are presented • We show that a single dot in a rod is a polarized single photon source • The degree of polarization of the emission around 80% • We show the possibility to identify the orientation of a single Dot-in-Rod • We propose a strategy to implement the sender site in a device F. Pisanello et al., Appl. Phys. Let. 96, 033101 (2010) PLMCN 10, 12/16 avril 2010 Cuernavaca

  21. G. Leménager : ROOM TEMPERATURE POLARIZED SINGLE PHOTON SOURCE WITH A COLLOIDAL DOT IN ROD. Work in progress • Implement the device proposed • Analysis of different lengths of cores and shells • Spectrum measurements • Coherence time measurements PLMCN 10, 12/16 avril 2010 Cuernavaca

  22. G. Leménager : ROOM TEMPERATURE POLARIZED SINGLE PHOTON SOURCE WITH A COLLOIDAL DOT IN ROD. Thanks to : • Antonio Qualtieri • Riccardo Messina • Gianmichele Epifani • Dr. Giuseppe Patera • Dr. Giovanni Morello • Gianvito Caputo • Dr. Alessandro Massaro • Dr. Vittorianna Tasco • Dr. Maria Teresa Todaro PLMCN 10, 12/16 avril 2010 Cuernavaca

  23. G. Leménager : ROOM TEMPERATURE POLARIZED SINGLE PHOTON SOURCE WITH A COLLOIDAL DOT IN ROD. Thank you for your attention PLMCN 10, 12/16 avril 2010 Cuernavaca

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