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  • 2015 European Conference on Lasers and Electro-Optics - European Quantum Electronics Conference
  • (Optica Publishing Group, 2015),
  • paper EG_P_14

Fine-Structure Relaxation Mechanisms and Discrete Exciton-Phonon Coupling in Single Colloidal CdSe/CdS/PMMA Quantum Dots

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Abstract

Tunable electronic properties and large transition dipole moments of colloidal core/shell quantum dots are highly attractive for applications in quantum optics [1]. We investigate temperature-dependent optical emission properties of single CdSe/CdS colloidal quantum dots (QDs) embedded in a PMMA nanoshell. The two lowest exciton fine-structure levels (“A” and “F”) in these nanoparticles exhibit bright and stable emission below 70 K (Fig. 1(a)). In addition to the zero-phonon peak, five narrow sidebands are observed in the photoluminescence (PL). These features are attributed to discrete acoustic phonon modes of the nanoparticle. The eigen-frequencies νl,n of an elastic vibrating sphere are calculated using Lamb’s theory [2], where the quantum numbers l = 0,1,2.. and n = 1,2,3.. describe the angular and the radial parts of the vibrational modes.

© 2015 IEEE

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