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Single and three pulse photoselection of dye probes in nematic liquid crystals

Armoogum, DA; Bryant, J; Monge, EM; Bain, AJ; (2002) Single and three pulse photoselection of dye probes in nematic liquid crystals. In: Khoo, IC, (ed.) Liquid Crystals VI. Society of Photo-Optical Instrumentation Engineers (SPIE): Seattle, WA, USA. Green open access

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Abstract

We present results of single and three pulse photoselection studies of the dynamics of a fluorescent probe (Oxazine 4) in the nematic phase of the liquid crystal 4-n-pentyl-4'-cyanobiphenyl (5CB). The combination of these techniques with time resolved fluorescence anisotropy measurements allows the unambiguous determination of the full angular motion of the probe together with the ground and excited state degrees of equilibrium (steady state) alignment. The restricted geometry imposed by the nematic host is seen to impart a marked anisotropy in theta and phi diffusion (gamma(phi)/gamma(theta)similar to4).

Type: Proceedings paper
Title: Single and three pulse photoselection of dye probes in nematic liquid crystals
Event: Liquid Crystals VI
Location: SEATTLE, WA
Dates: 08 July 2002 - 09 July 2002
ISBN: 0819445673
Open access status: An open access version is available from UCL Discovery
DOI: 10.1117/12.452487
Publisher version: http://dx.doi.org/10.1117/12.452487
Language: English
Additional information: Copyright © 2002 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: molecular probe, alignment, rotational diffusion, picosecond, fluorescence anisotropy, polarisation, anisotropic fluid media, picosecond polarized fluorescence, laser techniques, absorption
UCL classification: UCL
UCL > Provost and Vice Provost Offices
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.ucl.ac.uk/id/eprint/27787
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