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L. Coolen, C.Schwob, A. Maître Institut des Nanosciences de Paris (Paris) Engineering Emission Properties with Plasmonic Structures B.Habert, F. Bigourdan,

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Presentation on theme: "L. Coolen, C.Schwob, A. Maître Institut des Nanosciences de Paris (Paris) Engineering Emission Properties with Plasmonic Structures B.Habert, F. Bigourdan,"— Presentation transcript:

1 L. Coolen, C.Schwob, A. Maître Institut des Nanosciences de Paris (Paris) Engineering Emission Properties with Plasmonic Structures B.Habert, F. Bigourdan, F. Marquier, JJ. Greffet Laboratoire Charles Fabry de ’Institut d’Optique, Palaiseau (France) C.Belacel, S.Michaelis De Vasconcellos, X.Lafosse, P. Senellart Laboratoire de Photonique et Nanostructure (Marcoussis) C. Javeaux, B. Dubertret Ecole Supérieure de Physique et de Chimie Industrielles (Paris)

2 2 Plasmonic Gold Nanoshell Dielectric Gold Emitter ~ 100nm ~ 10nm

3 3 Resonance of a Nanoshell + + + + + + - - - - - Restoring force = resonance

4 4 Tunable Resonance

5 5 Emission Enhancement Small mode volume: high Local Density of Optical States

6 6 Radiative Purcell Factor

7 7 Excitation Enhancement Ratio =

8 8 SNR Enhancement

9 9 Fabrication + Quality Factor

10 10 Plasmonic Patch Antenna Purcell 1946 Spontaneous emission depends on Local Density of States Small mode volume  High density of state  Fast decay Structure geometry  radiation pattern |E Z | + + + - - - - - - + + + - - - + + +

11 11 Fabrication Process Colloidal Quantum Dots B. Dubertret (ESPCI) Optical In-Situ Lithography P. Senellart (LPN)

12 12 Measurement of Decay Rate Start-Stop Lifetime measurement A. Maître (INSP)

13 13 Measurement of Directivity θ r High NA microscope objective Back- Focal Plane Image of the back focal plane

14 14 Conclusions Small volumes lead to decay rate enhancement Coupling far field to the emitter increases fluorescence efficiency Structure geometry for tuning of radiation pattern

15 15 Perspectives Single Quantum Dots Improving radiative efficiency * Photon Plasmonic antenna mode Quenching (heat) coupled to far-field absorbed

16 16 Spontaneous Emission or Quenching? * Photon (vacuum mode) Plasmon (surface mode) Quenching (heat) coupled to far-field absorbed

17 17 Controlling Spontaneous Emission | E Z |

18 18 Log 10 (Purcell factor) Disk diameter (um) dielectric thickness (um) 30 nm thickness

19 19 Controlling Directivity + + + - - - + + + - - - + + + - - - + + + - - - + + + - - - Standing wave for the current distribution in the metal The structure radiates as an antenna Radiation patterns controlled by the shape/size of the antenna

20 20 Without surface scattering With surface scattering d_scatt = 2nm Radiation Efficiency

21 21 Plasmonic antenna as a solution Alberto G. Curto, et al. Science 329, 930 (2010) Sergei Kuhn, et al. PRL 97, 017402 (2006)

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