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Wavelength tuning the photonic band gap in chiral nematic liquid crystals using electrically commanded surfaces

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4 Author(s)
Seok Choi, Su ; Centre of Molecular Materials for Photonics and Electronics, Engineering Department, University of Cambridge, 9 JJ Thomson Avenue, Cambridge CB3 0FA, United Kingdom ; Morris, Stephen M. ; Coles, Harry J. ; Huck, Wilhelm T.S.

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In this letter, the authors demonstrate photonic band gap (PBG) tuning in chiral nematic liquid crystals using electrically commanded surfaces consisting of a ferroelectric liquid crystal. The electrically commanded surfaces generate a contraction of the pitch of the chiral nematic which is manifested as a blueshift of the PBG. Results are presented which demonstrate that tuning can be achieved by either varying the frequency or the amplitude of the electric field. The maximum shift observed for the long-wavelength band edge was 23 nm for an electric field strength of 20 V μm-1 and a frequency of 800 Hz to 1 kHz.

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Applied Physics Letters  (Volume:91 ,  Issue: 23 )