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

Stephen M. Morris, Damian J. Gardiner, Philip J.W. Hands, Malik M. Qasim, Timothy D. Wilkinson, Ian H. White, Harry J. Coles

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)

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.

Original languageEnglish
Article number071110
JournalApplied Physics Letters
Volume100
Issue number7
DOIs
Publication statusPublished - 13 Feb 2012

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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