MRS Proceedings

Articles

Ultrafast Switching Liquid Crystals for Electro-Optic Transmissive and Reflective Displays and Microscopic Lasers

2010 MRS Fall Meeting.

Harry J Colesa1, Stephen M Morrisa1, Flynn Castlesa1, Philip J W Handsa1, Timothy D Wilkinsona1 and Su Soek Choia1

a1 Centre of Molecular Materials for Photonics and Electronics, Electrical Engineering Division, University of Cambridge, 9 JJ Thomson Avenue, Cambridge, Cambridgeshire, CB3 0FA, UK.

ABSTRACT

We report on novel liquid crystals with extremely large flexoelectric coefficients in a range of ultra-fast photonic modes, namely 1) the uniform lying helix, that leads to in-plain switching, birefringence phase devices with 100 μs switching times at low fields, i.e.2-5 V/μm, and analogue or grey scale capability, 2) the uniform standing helix, using planar surface alignment and in-plane fields, with sub ms response times and optical contrasts in excess of 5000:1 with a perfect optically isotropic or black “off state”, 3) the wide temperature range blue phase that leads to field controlled reflective color, 4) chiral nematic optical reflectors electric field tunable over a wide wavelength range and 5) high slope efficiency, wide wavelength range tunable narrow linewidth microscopic liquid crystal lasers.

Key Words:

  • liquid crystal;
  • laser;
  • optoelectronic
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