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Proceedings Paper

Photonic band edge lasing in dye-doped chiral nematic bimesogen liquid crystals
Author(s): Alison Ford; Stephen Morris; Mikhail Pivnenko; Andrew Blatch; Harry Coles
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Paper Abstract

In this paper we investigate Photonic Band Edge (PBE) lasing from a homologous series of non-symmetric bimesogen liquid crystals (the mesogenic units are not identical) with varying physical parameters. A homologous series was synthesised, where the number of methylene units in the linking flexible spacer chain ranged from 6 to 12. Our results show a clear odd-even effect within the threshold values and slope efficiencies, of the PBE lasers, when plotted as a function of the number of methylene units in the spacer chain. The even spacer bimesogen PBE lasers performed with an overall higher efficiency (< 2μJ/pulse threshold values and 8% slope efficiency) than the odd spacer bimesogens PBE lasers (3.5μJ/pulse threshold values and 1% slope efficiency). We believe that this odd-even effect is due to the odd-even effect observed within the host physical parameters; a consequence of the molecular shape anisotropy

Paper Details

Date Published: 12 April 2005
PDF: 11 pages
Proc. SPIE 5741, Emerging Liquid Crystal Technologies, (12 April 2005); doi: 10.1117/12.593330
Show Author Affiliations
Alison Ford, Univ. of Cambridge (United Kingdom)
Stephen Morris, Univ. of Cambridge (United Kingdom)
Mikhail Pivnenko, Univ. of Cambridge (United Kingdom)
Andrew Blatch, Univ. of Cambridge (United Kingdom)
Harry Coles, Univ. of Cambridge (United Kingdom)

Published in SPIE Proceedings Vol. 5741:
Emerging Liquid Crystal Technologies
Liang-Chy Chien, Editor(s)

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