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 0003-6951Full text not available from this repository.
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.
|Divisions:||Div B > Photonics|
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|Date Deposited:||09 Dec 2016 17:53|
|Last Modified:||23 Apr 2017 23:25|