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Metallic structures open the possibility to optimize the emission of a single emitter for the generation of single photons. High collection efficiency can be achieved and the radiative decay rate can be increased through the well-known Purcell effect. For emitters operating at room temperature and thus showing a large linewidth, plasmonic structures are specially well-suited since they exhibit a very...
It is well-known that, at the single molecule level, the fluorescence emission of semi-conductor nanocrystals (NCs) fluctuate in intensity. For regular NCs, these fluctuations are between “on and off” states, due to the existence of a complete dark state. This corresponds to the blinking phenomenon. This blinking has been associated to the very efficient Auger recombination processes. Recently, CdSe/CdS...
In the field of quantum optics, the control of the radiative properties of single emitter through its coupling to a photonic structure has attracted great attention. In particular, optical cavities enable to reduce the radiative lifetime through the effect first discribed by Purcell. The Purcell factor, which is equal to the increase of the radiative decay rate, is proportional to the cavity quality...
The blinking of fluorophore, that means the switch between bright and dark states, is a well-known phenomenon for single emitters. In the case of standard CdSe/ZnS colloidal quantum dots (QDs), this was considered as their main drawback for experiments at the single molecule level. Statistical analysis of these intensity fluctuations has demonstrated that the dark states duration exhibits a universal...
In this paper, we show that the synthesis of thick shell enables to strongly reduce the blinking of colloidal quantum dots. It opens also new opportunities in terms of quantum engineering of the career wavefunctions. Modifying the Auger effect efficiency which is a crucial parameter to control the quantum optical properties of an individual nanocrystal fluorescence, we were able to observe radiative...
This paper describes the modification of individual CdSe-CdS nanocrystals emission deposited at a controlled distance d from a gold semicontinous film. These colloidal quantum dots exhibit many promising optical properties and can be easily manipulated. Emission wavelength can be tuned between 450 and 600 nm through the control of the nanocrystals synthesis parameters. Finally, the results reveal...
Abstract: In the standard description of phase separation, quenching from an initial equilibrium state to a final metastable state in the two-phase region is usually assumed to be instantaneous. Such an artificial situation is nevertheless intrinsically at variance with experiments because the quench rate is finite due to the continuous changes in thermodynamic parameters between the initial and final...
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