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Proceedings Paper

Simple and functional photonic devices from printable liquid crystal lasers
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Paper Abstract

In this paper we demonstrate laser emission from emulsion-based polymer dispersed liquid crystals. Such lasers can be easily formed on single substrates with no alignment layers. Remarkably, it is shown that there can exist two radically different laser emission profiles, namely, photonic band-edge lasing and non-resonant random lasing. The emission is controlled by simple changes in the emulsification procedure. Low mixing speeds generate larger droplets that favor photonic band edge lasing with the requisite helical alignment produced by film shrinkage. Higher mixing speeds generate small droplets, which facilitate random lasing by a non-resonant scattering feedback process. Lasing thresholds and linewidth data are presented showing the potential of controllable linewidth lasing sources. Sequential and stacked layers demonstrate the possibility of achieving complex, simultaneous multi-wavelength and "white-light" laser output from a wide variety of substrates including glass, metallic, paper and flexible plastic.

Paper Details

Date Published: 7 September 2011
PDF: 10 pages
Proc. SPIE 8114, Liquid Crystals XV, 81140M (7 September 2011); doi: 10.1117/12.893448
Show Author Affiliations
D. J. Gardiner, Univ. of Cambridge (United Kingdom)
P. J. W. Hands, Univ. of Cambridge (United Kingdom)
S. M. Morris, Univ. of Cambridge (United Kingdom)
T. D. Wilkinson, Univ. of Cambridge (United Kingdom)
H. J. Coles, Univ. of Cambridge (United Kingdom)


Published in SPIE Proceedings Vol. 8114:
Liquid Crystals XV
Iam Choon Khoo, Editor(s)

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