Optical Antennas

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Accelerated spontaneous emission

We calculate the emission rates of single emitters coupled to dielectric or metallic nanoresonators. This work is carried out in close collaboration with Sebastien Bidault from the Institut Langevin in Paris.
This work was hilighted by the french center for scientific research (CNRS), the French Agence Nationale de la Recherche, Sciences et Avenir, ...
M. P. Busson, B. Rolly, B. Stout, N. Bonod, S. Bidault, “Accelerated single photon emission from dye molecule driven nanoantennas assembled on DNA,” Nature Commun. 3, 962 (2012)
M. P. Busson, B. Rolly, B. Stout, N. Bonod, J. Wenger, S. Bidault, “Photonic engineering of hybrid metal-organic chromophores,” Angew. Chem. Int. Ed.,doi : 10.1002/anie.201205995 (2012)
M. P. Busson, B. Rolly, B. Stout, N. Bonod, E. Larquet, Albert Polman, S. Bidault, “Optical and topological characterization of gold nanoparticle dimers linked by a single DNA double-strand,” Nano Lett. 11, 5060-5065 (2011)

We also investigate the calculation of the Local Density Of States (LDOS) with magneto-electric antennas.
B. Rolly, B. Bebey, S. Bidault, B. Stout, N. Bonod, “Promoting Magnetic Dipolar Transition in Trivalent Lanthanide Ions with Lossless Mie Resonances,” Phys. Rev. B 85, 245432 (2012)

Directive antennas

We investigate the angular redistribution of light radiated by a single emitter coupled with an antenna.

- Crucial role of the emitter/particle distance

We point out the fundamental role of the phase differences introduced by the optical path difference between the emitter and the particle. We demonstrate that the reflecting properties of a single particle nanoantenna can be extremely sensitive to its distance from a quantum emitter at frequencies lower than the plasmon resonance.

N. Bonod, A. Devilez, B. Rolly, S. Bidault, B. Stout, “Ultracompact and unidirectional metallic antennas,” Phys. Rev. B 82, 115429 (2010).
B. Rolly, B. Stout, S. Bidault, N. Bonod, “Crucial role of the emitter–particle distance on the directivity of optical antennas,” Opt. Lett. 36, 3368-3370 (2011)

- Metallo-dielectric antenna
Dielectric sub-micrometric particles can behave as very efficient collectors. They provide high gain in directivity together with high quantum efficiency.

The diameter of the dielectric collector can be further reduced when considering dielectric resonators exhibiting both electric and magnetic responses.

B. Rolly, B. Stout, and N. Bonod, "Boosting the directivity of optical antennas with magnetic and electric dipolar resonant particles," Opt. Express 20, 20376-20386 (2012)
A. Devilez, B. Stout, N. Bonod, “Compact Metallo-dielectric Optical Antenna For Ultra Directional and Enhanced Radiative Emission,” ACS Nano 4, 3390–3396 (2010).

Confinement and scattering of light by metallic dimers or trimers

We study the light confinement in a trimer of metallic nanoparticles and show that the light between two neighboring nanoparticles can be vanished by properly exciting an eigenmode of the structure.

A. Devilez, B. Stout, N. Bonod, “Mode-balancing far-field control of light localization in nanoantennas,” Phys. Rev. B 81, 245128 (2010).

We study the light scattering by a dimer of metallic nanoparticles. We show that the quasi-static approximation fails when the scattering becomes predominant over absorption. For particles largely smaller than the wavelength (diameter typically around 100 nm), the brightest mode is revealed to be the mode predicted as dark in the quasi-static approximation.
B. Rolly, B. Stout, N. Bonod, “Metallic dimers : When bonding transverse modes shine light,” Phys. Rev. B. 84, 125420 (2011)

Funding :
This work is funded by the French Agence Nationale de la Recherche under Contract No. ANR-11-BS10-002-02 TWINS.
Consortium : Institut Fresnel (Marseille), Institut Langevin (Paris), LNIO (Troyes)