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Publication Detail
Polarized stimulated emission depletion studies of two-photon excited states
  • Publication Type:
    Conference
  • Authors:
    Armoogum DA, Marsh RJ, Bain AJ
  • Publication date:
    2003
  • Pagination:
    34, 44
  • Published proceedings:
    Proceedings of SPIE
  • Volume:
    5222
  • Editors:
    Andrews DL,Gaburro Z,Cartwright AN,Lee CYC
  • Status:
    Published
  • Name of conference:
    Nanocrystals, and Organic and Hybrid Nanomaterials
  • Conference start date:
    04/08/4003
  • Keywords:
    DEPLETION, emission, EXCITED-STATE, STATE, STATES
Abstract
San Diego, CA, USA 4 August 2003 Stimulated emission depletion (STED) population and polarisation dynamics following two-photon excitation are investigated for rhodamine 6G in ethylene glycol. Time resolved fluorescence intensity and polarisation measurements were made using picosecond time-correlated single photon counting (TCSPC). Cross-sections for the stimulated transition were measured between 614nm (2.32x10-16 cm2) and 663.5nm (6.05x10-17 cm2), ground state vibrational lifetimes were found to vary between 314fs and 467fs. A collinear (180°) excitation-detection geometry was employed to investigate re-polarisation of the excited state array yielding fluorescence anisotropies above the two-photon limit. The circumvention of single-photon selection rules is demonstrated allowing the measurement of higher order parameters and correlation functions that are wholly inaccessible to 'conventional' (spontaneous) time resolved fluorescence techniques
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