Abstract
We present new results on single SiO<sub>2</sub> nanoparticles (SiO<sub>2</sub> NPs). NPs were obtained by full oxidation in water of silicon nanocrystals synthesized by CO<sub>2</sub> laser pyrolysis of SiH4. Samples of SiO<sub>2</sub> NPs embedded in low concentration in a thin polymer layer were prepared by spin-coating a dedicated solution on quartz cover slides. Using focused higher order laser modes, we determine the three-dimensional orientation of the nanoparticles' transition dipole moment (TDM). The SiO<sub>2</sub> NPs were found to possess a quite stable and randomly oriented TDM. However, characteristic dynamical effects featuring single NPs such as fluorescence intermittency and TDM flipping could also be observed. Photoluminescence (PL) spectroscopy of single SiO<sub>2</sub> NPs revealed spectra with a double-peak structure consisting of a narrow zero-phonon line and a broader phonon band. The phonon band can be attributed to longitudinal optical phonons excited in the SiO<sub>2</sub> network.
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