Armoogum, DA;
Marsh, RJ;
Bain, AJ;
(2003)
Polarised stimulated emission depletion studies of two-photon excited states.
In: Andrews, DL and Gaburro, Z and Cartwright, AN and Lee, CYC, (eds.)
Nanocrystals, and Organic and Hybrid Nanomaterials.
Society of Photo-Optical Instrumentation Engineers (SPIE): San Diego, CA, USA.
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Abstract
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 (2.32 X 10(-16) cm(2)) and 663.5nm (6.05 X 10(-17) cm(2)), ground state vibrational lifetimes were found to vary between 314fs and 467fs. A collinear (180degrees) 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.
| Type: | Proceedings paper |
|---|---|
| Title: | Polarised stimulated emission depletion studies of two-photon excited states |
| Event: | Nanocrystals, and Organic and Hybrid Nanomaterials |
| Location: | SAN DIEGO, CA |
| Dates: | 04 August 2003 - 08 August 2003 |
| ISBN: | 0819450952 |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1117/12.505839 |
| Publisher version: | http://dx.doi.org/10.1117/12.505839 |
| Language: | English |
| Additional information: | Copyright © 2003 Society of Photo Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited. |
| Keywords: | stimulated emission depletion, vibrational relaxation, two-photon, polarisation, selection rules, anisotropic fluid media, fluorescence microscopy, spectroscopy, excitation, probes |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/29743 |
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