Centre d’Élaboration de Matériaux et d’Etudes Structurales (UPR 8011)


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Quantum Plasmonics and Nanophotonics

Quantum Plasmonics & nanophotonics aim at transposing at 2D the concepts of Quantum Optics by replacing a high-Q cavity mode by a plasmon polariton sustained by a metallic nanostructure or by a photonic mode in a dielectric nanocavity with appropriate geometry. Surface plasmon are longitudinal modes at the interface between a metal and a dielectric that allow for two-dimensional (2D) propagation and for high field confinement and enhancement in subwavelength volumes. On the other hand, dielectric nanostructures sustain photonic modes with similar confinement, enhancement and propagation properties. The quantum regime requires single elementary excitations and can be obtained by coupling one or several single photon emitters [1] to either plasmonic or photonic cavities. This single excitation realm can lead to intriguing regimes where antibunching, quantum interferences or entanglement could be observed in metallic or dielectric nanostructures. It will open the door to the engineering of elementary quantum-plasmonic or nanophotonic building blocks for optical information transfer and processing.

Contact : aurelien.cuche[at]cemes.fr

 

Single photon source : colored centers (NV) in nanodiamond

 

Figure 1 : left – Photoluminescence confocal map of single nanodiamonds hosting NV- color centers. Right – Photoluminescence spectrum of the negatively-charged NV center (the antibunching curve shown in inset is extracted from reference [1]). © CEMES-CNRS

 

 Propagation and manipulation of single photon/plasmon at 2D

 

Figure 2 : left – Schematic representation of a two-level quantum emitter electromagnetically coupled to a 2D nano-cavity. Right – Photoluminescence confocal map of single nanodiamonds hosting NV- color centers coupled to a colloidal gold cavity. © CEMES-CNRS

 

Hyperspectral quantum NSOM

 

Figure 3 : left – Schematic representation of a scalar & quantum emitter grafted at the apex of a NSOM tip and scanned above a 2D silver nano-cavity. Center – Pixel by pixel image of the fluorescence of the nanodiamond above a 500 nm cavity. Right – Corresponding simulated radiative decay rate for a scalar emitter scanned above the same 2D cavity. The results are extracted from reference [2]. (This work is a collaboration between the Néel Institute, the ICB lab and the GNS and NeO groups at CEMES) © CEMES-CNRS

 

 

[1] Y. Sonnefraud et al., Opt. Lett. 33, 611 (2008)

[2] A. Cuche et al., Phys. Rev. B 95, 121402(R) (2017)

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