JCJC SIMI 4 - JCJC - SIMI 4 - Physique des milieux condensés et dilués

Quantum optics with single nanocrystals deterministically coupled to a dielectric micropillar – PONIMI

Submission summary

This project considers the coupling of a single fluorescent nano-emitter with an optical cavity. The emitters are colloidal nanocrystals. Their emission can be tuned in the whole visible range, and they exhibit single-photon emission from cryogenic to room temperatures. The use of a new generation of nanocrystals with a CdSe core and a thick CdS shell will provide the photostability (absence of blinking) necessary to the project. An in-depth study of these nanocrystals will be performed : spectral properties at low temperature (coherence, spectral diffusion), nature of the emitting level (single or double dipole), emission polarization. The optical cavities will be micropillars of SiO2/TiO2 Bragg mirrors with a diameter of a few microns.

The “deterministic” control of the spatial and spectral agreement between the emitter and the cavity mode is a crucial question. An efficient method has been demonstrated in 2008 to couple a quantum dot to a micropillar. It consists in locating, by fluorescence microscopy, an emitter in a planar cavity (Bragg mirrors) covered by a photoresist ; then exposing a disk of the resist, the diameter of which can be controlled through the exposure duration and is chosen in order for the micropillar mode to be resonant with the emitter ; then lift-off and etch the pillar. During this project, this fabrication activity will be started at the Institut de NanoSciences de Paris, with important adjustments (choice of materials, resist, exposure conditions….) to the case of colloidal nanocrystals.

The weak nanocrystal-micropillar coupling will be evidenced through a modification of the emitting level lifetime (Purcell effect). By tuning the emission line width, thanks to the large range of temperatures available for nanocrystals, the role of decoherence and phonons for off-resonance coupling will be analyzed. This point is specific to solid-state cavity quantum electrodynamics is still not well understood for quantum dots and can be useful to ease the condition for spectral agreement. Finally, the emission coherence properties will be characterized and two-photon interference experiments will be performed.

Project coordination

Laurent Coolen (Institut de NanoSciences de Paris) – laurent.coolen@insp.jussieu.fr

The author of this summary is the project coordinator, who is responsible for the content of this summary. The ANR declines any responsibility as for its contents.

Partner

INSP Institut de NanoSciences de Paris

Help of the ANR 264,072 euros
Beginning and duration of the scientific project: February 2013 - 46 Months

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