Lowering the excitation threshold of a random laser using the dynamic scattering states of an organosiloxane smectic A liquid crystal

Smectic A liquid crystals, based upon molecular structures that consist of combined siloxane and mesogenic moieties, exhibit strong multiple scattering of light with and without the presence of an electric field. This paper demonstrates that when one adds a laser dye to these compounds it is possibl...

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Veröffentlicht in:Journal of applied physics 2012-02, Vol.111 (3), p.033106-033106-6
Hauptverfasser: Morris, Stephen M., Gardiner, Damian J., Qasim, Malik M., Hands, Philip J. W., Wilkinson, Timothy D., Coles, Harry J.
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container_end_page 033106-6
container_issue 3
container_start_page 033106
container_title Journal of applied physics
container_volume 111
creator Morris, Stephen M.
Gardiner, Damian J.
Qasim, Malik M.
Hands, Philip J. W.
Wilkinson, Timothy D.
Coles, Harry J.
description Smectic A liquid crystals, based upon molecular structures that consist of combined siloxane and mesogenic moieties, exhibit strong multiple scattering of light with and without the presence of an electric field. This paper demonstrates that when one adds a laser dye to these compounds it is possible to observe random laser emission under optical excitation, and that the output can be varied depending upon the scattering state that is induced by the electric field. Results are presented to show that the excitation threshold of a dynamic scattering state, consisting of chaotic motion due to electro-hydrodynamic instabilities, exhibits lower lasing excitation thresholds than the scattering states that exist in the absence of an applied electric field. However, the lowest threshold is observed for a dynamic scattering state that does not have the largest scattering strength but which occurs when there is optimization of the combined light absorption and scattering properties.
doi_str_mv 10.1063/1.3681898
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title Lowering the excitation threshold of a random laser using the dynamic scattering states of an organosiloxane smectic A liquid crystal
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