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 hexagonal plasmonic cavity. Center - Emission spectrum of a nanodiamond hosting a single NV center positionned in the vicinity of a such hexagonal cavity made of cristalline gold (autocorrelation curve in inset). Right - Luminescence wide-field image of this single nanodiamond coupled to the hexagonal platelet (8 µm from the left extremity to the right one). This image shows the plasmon-mediated propagation of the signal. The results are extracted from reference [2]. (This work is a collaboration between the NeO and GNS groups at CEMES and ETH Zurich) © CEMES-CNRS
Figure 3 : (a) Scanning electron microscopy image of the hexagonal platelet after carving of a Bragg mirror by a focused ion beam (FIB). (b) Luminescence wide-field image of the single nanodiamond coupled to the hexagonal platelet after FIB reshaping. (c) Simulation of the system shown in (b) (Dyadic Green function formalism). The results are extracted from reference [2]. (This work is a collaboration between the NeO and GNS groups at CEMES and ETH Zurich) © CEMES-CNRS
Hyperspectral quantum NSOM
Figure 4 : left – Schematic representation of a scalar & quantum emitter grafted at the apex of a NSOM tip [3] and scanned above a 2D silver nano-cavity. Center – Simulation of the local optical density of states (LDOS) above a 900 nm cavity. Right – Comparison of the LDOS and the photoluminescence signal along a line above the structure, illustrated by the yellow arrow in the central image. The results are extracted from reference [4]. (This work is a collaboration between the Néel Institute, the ICB lab and the NeO and GNS groups at CEMES) © CEMES-CNRS
Control of single photon propagation in Silicon nanostructures
Figure 5 : Top - Luminescence wide-field image of a single nanodiamond positioned at one extremity of a silicon nanowire with a length of 7 µm. The propagation of the single photons in the nanowire can be observed. The scanning electron microscopy image of the silicon nanowire is shown in inset. Bottom - Autocorrelation functions acquired either directly on the nanodiamond (in) or after propagation of the photons in the nanowire (out). These curves show a similar antibunching signature that reveals the quantum nature of this punctual light source. Results are extracted from reference [5]. (This work is a collaboration between the LAAS, the ICB laboratory and the NeO group at CEMES) © CEMES-CNRS
Deterministic positioning of quantum emitters AFM nanoxerography
Figure 6 : Left – Two atomic force microscopy (AFM) images with different magnifications showing nanodiamonds deterministically positionned on a SOI substrate by AFM nanoxerography. Center - Photoluminescence confocal image of the nanodiamond shown in the left image. Right – Autocorrelation function with photon antibunching acquired on the same nanodiamond. Results are extracted from reference [6]). (This work is a collaboration between the NeO group at CEMES, the Nanotech group at LPCNO and the LAAS) © CEMES-CNRS
[1] Y. Sonnefraud et al., Opt. Lett. 33, 611 (2008).
[2] U. Kumar et al., Nanoscale 12, 13414 (2020).
[3] A. Cuche et al., Nanolett. 10, 4566 (2010).
[4] A. Cuche et al., Phys. Rev. B 95, 121402(R) (2017).
[5] M. Humbert et al., en préparation (2020).
[6] M. Humbert et al., en préparation (2020).