CUED Publications database

Simple and functional photonic devices from printable liquid crystal lasers

Gardiner, DJ and Hands, PJW and Morris, SM and Wilkinson, TD and Coles, HJ (2011) Simple and functional photonic devices from printable liquid crystal lasers. In: UNSPECIFIED.

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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. © 2011 Copyright Society of Photo-Optical Instrumentation Engineers (SPIE).

Item Type: Conference or Workshop Item (UNSPECIFIED)
Uncontrolled Keywords: laser liquid crystal photonic band-gap printable random laser Alignment layers Band edge Feedback process Film shrinkage Flexible plastics Laser emission Laser output Lasing threshold Liquid-crystal lasers Mixing speed Multiwavelength Nonresonant Photonic band edge Polymer dispersed liquid crystals printable Random lasers Random lasing Small droplets Stacked layer White light Alignment Crystals Drop formation Emulsification Functional polymers Glass lasers Lasers Liquid crystals Liquid lasers Photonic band gap Photonic devices
Divisions: Div B > Photonics
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:01
Last Modified: 27 Jul 2017 05:49