Regensburg 2010 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 49: Optical Properties
HL 49.4: Vortrag
Donnerstag, 25. März 2010, 10:15–10:30, H14
Confocal microscopy with cylindrical vector beams and spectroscopy of single silicon nanoparticles — •Anna Chizhik1, Alexey Chizhik1, Torsten Schmidt2, Sebastian Baer1, Friedrich Huisken2, and Alfred Meixner1 — 1Inst. of physical and theor. Chem.., Univ. of Tuebingen — 2Lab. Astrophys., Group of the MPI for Astronomy at the Inst. of Solid State Phys., Univ. of Jena
Being the paramount material silicon revealed new magnificent outlooks with the development of nanotechnology. During last years the research on silicon nanoparticles has been one of the hottest topics. However, many of their photoluminescence (PL) properties are still unclear. Combining the confocal microscopy, spectroscopy, and cylindrical vector beams (also known as higher order laser modes) we reveal new details of fundamental PL properties of Si/SiO2 core-shell systems and hollow SiO2 shells. We show that the emission from both systems may originate from defects of the SiO2 structure or at the Si-SiO2 interface. This result demonstrates the effect of *break-down* of the quantum confinement in small Si/SiO2 nanoparticles, which limits the PL tunability and thus, applications in Si optical nanostructures, especially in the short wavelength range. Using the technique of cylindrical vector beams we demonstrate that SiO2 nanoparticles and Si/SiO2 nanocrystals, where the PL originates from defects, possess linear transition dipole moment (TDM). Moreover, we precisely determine the 3-dimensional orientation of single nanoparticle TDM and show such dynamical effects as TDM sudden flipping.