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15.11.2007

Nature 450, 402-406 (15 November 2007) | doi:10.1038/nature06230; Received 10 April 2007; Accepted 4 September 2007



Generation of single optical plasmons in metallic nanowires coupled to quantum dots


A. V. Akimov1,4,5, A. Mukherjee1,5, C. L. Yu2,5, D. E. Chang1, A. S. Zibrov1,4, P. R. Hemmer3, H. Park1,2 & M. D. Lukin1




  1. Department of Physics,
  2. Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, USA
  3. Department of Electrical and Computer Engineering, Texas A&M University, College Station, Texas 77843, USA
  4. P.N. Lebedev Physical Institute RAS, Leninskiy prospect 53, Moscow, 119991, Russia
  5. These authors contributed equally to this work.


Correspondence to: H. Park1,2M. D. Lukin1 Correspondence and requests for materials should be addressed to M.D.L. (Email: lukin@fas.harvard.edu) and H.P. (Email: Hongkun_Park@harvard.edu).




Control over the interaction between single photons and individual optical emitters is an outstanding problem in quantum science and engineering. It is of interest for ultimate control over light quanta1, as well as for potential applications such as efficient photon collection2, single-photon switching3 and transistors4, and long-range optical coupling of quantum bits5, 6. Recently, substantial advances have been made towards these goals, based on modifying photon fields around an emitter using high-finesse optical cavities2, 3, 5, 6, 7, 8. Here we demonstrate a cavity-free, broadband approach for engineering photon–emitter interactions4, 9 via subwavelength confinement of optical fields near metallic nanostructures10, 11, 12, 13. When a single CdSe quantum dot is optically excited in close proximity to a silver nanowire, emission from the quantum dot couples directly to guided surface plasmons in the nanowire, causing the wire's ends to light up. Non-classical photon correlations between the emission from the quantum dot and the ends of the nanowire demonstrate that the latter stems from the generation of single, quantized plasmons. Results from a large number of devices show that efficient coupling is accompanied by more than 2.5-fold enhancement of the quantum dot spontaneous emission, in good agreement with theoretical predictions.



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  • Chen Wev .  honorary member of ISSC science council

  • Harton Vladislav Vadim  honorary member of ISSC science council

  • Lichtenstain Alexandr Iosif  honorary member of ISSC science council

  • Novikov Dimirtii Leonid  honorary member of ISSC science council

  • Yakushev Mikhail Vasilii  honorary member of ISSC science council

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