Institut des
NanoSciences de Paris
insp
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Patch nano-antenna

An antenna is a device which enhances the coupling between a local electric oscillator and the propagating waves of the electromagnetic waves. Antennas are widely used for the emission and reception of radio waves, but their visible counterparts have only been considered recently as their dimensions must be controlled with wavelength-scale precision. Positioning the light emitter with respect to the antenna is an especially delicate aspect of coupling.

We have fabricated patch nano-antenna where the emitter is located 15 nm above a metallic plane and 15 nm below a metallic disk of 1 to 2 µm (fig. 1a). For a nanocrystals agregate in a patch antenna, placed deterministically at the center of the disk, acceleration factors up to 80 have been measured (fig. 1b-d). We have developped lithography protocols for the deterministic positioning of a single nanocrystal at the center of a patch antenna and shown a strong luminescence enhancement and an important contribution from multi-excitons.

Figure 1 : (a) Schematic of the patch antenna ; (b) observation by fluorescence microscopy (collab. IOGS) : the emitter at the center is coupled to an antenna and appears much brighter than the neighbouring non-coupled emitters ; (c) decay curves of three different antennas with different diameters (red) and an emitter in a reference medium (homog. silica) ; (d) acceleration factors extracted for a vertical dipole (blue) and a horizontal dipole (red).

 

Collaborations :
- Pascale Senellart at the LPN (Marcoussis)

- Jean-Jacques Greffet and François Marquier at the IOGS (Palaiseau)

- Benoît Dubertret and Thomas Pons at the ESPCI (Paris)

 

Communications :

- C. Belacel, A. Raj Dhawan, F. Bigourdan, B. Habert, X. Lafosse, F. Marquier, L. Coolen, B. Dubertret, J.-J. Greffet, P. Senellart et A. Maître, Deterministical coupling of nanocrystal to plasmonic patch antenna : Purcell effect and directionality, International Conference on Nanoscience + Technology (ICN+T), Vail (Etats-Unis), 21-25 juillet 2014,

- C. Belacel, A. Raj Dhawan, B. Habert, F. Bigourdan, F. Marquier, L. Coolen, X. Lafosse, B. Dubertret, J.-J. Greffet, P. Senellart et A. Maître, Purcell effect and directional emission in a plasmonic patch antenna, Spie Photonics Europe (Bruxelles, 14-18 avril 2014)

- C.Belacel, B.Habert, F. Bigourdan, C. Javeaux, L. Coolen, C.Schwob, S.Michaelis De Vasconcellos, X.Lafosse, B. Dubertret, F. Marquier, P. Senellart, JJ. Greffet, A. Maître, Emission in plasmonics patch nanoantennas, Surface Plasmon Polariton 6, Ottawa (27-31 mai 2013),

- C.Belacel, B.Habert, F. Bigourdan, C. Javeaux, L. Coolen, C.Schwob, S.Michaelis De Vasconcellos, X.Lafosse, B. Dubertret, F. Marquier, P. Senellart, J.-J. Greffet et A. Maître, Emission in plasmonics patch nanoantennas, Photonics West, San Francisco 02/2013

- C. Belacel, B. Habert, F. Bigourdan, F. Marquier, J.-P. Hugonin, S. Michaelis de Vasconcellos, X. Lafosse, L. Coolen, C. Schwob, C. Javaux, B. Dubertret, J.-J. Greffet, P. Senellart et A. Maître, Controlling Spontaneous Emission with Plasmonic Optical Patch Antennas, Nano Lett. 13, 1516 (2013),

- C. Belacel, X. Lafosse , B. Malher, B. Dubertet, A. Maître , P. Senellart, Nanocristaux en cavité micropilier en vue de la réalisation d’une source de photons uniques efficace à température ambiante, Journées Nationales de l’Optique Guidée, Besançon, 20-22 octobre 2010,