CUED Publications database

Electrically switchable random to photonic band-edge laser emission in chiral nematic liquid crystals

Morris, SM and Gardiner, DJ and Hands, PJW and Qasim, MM and Wilkinson, TD and White, IH and Coles, HJ (2012) Electrically switchable random to photonic band-edge laser emission in chiral nematic liquid crystals. Applied Physics Letters, 100. ISSN 0003-6951

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Abstract

Using a chiral nematic liquid crystal with a negative dielectric anisotropy, it is possible to switch between band-edge laser emission and random laser emission with an electric field. At low frequencies (1 kHz), random laser emission is observed as a result of scattering due to electro-hydrodynamic instabilities. However, band-edge laser emission is found to occur at higher frequencies (5 kHz), where the helix is stabilized due to dielectric coupling. These results demonstrate a method by which the linewidth of the laser source can be readily controlled externally (from 4 nm to 0.5 nm) using electric fields. © 2012 American Institute of Physics.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div B > Photonics
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 11:29
Last Modified: 08 Dec 2014 02:36
DOI: 10.1063/1.3684804