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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 18 — Aug. 27, 2012
  • pp: 20124–20129

Submillisecond-response and scattering-free infrared liquid crystal phase modulators

Jie Sun, Yuan Chen, and Shin-Tson Wu  »View Author Affiliations

Optics Express, Vol. 20, Issue 18, pp. 20124-20129 (2012)

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We demonstrate a submillisecond-response and scattering-free infrared phase modulator using a polymer network liquid crystal (PNLC). The required voltage for achieving 2π phase change at λ = 1.06 µm is 70V (or 5.8 V/μm) and the measured response time is ~200 µs at 25°C and 30 µs at 70°C. Opposite to our conventional understanding, a high viscosity LC helps to achieve small domain size during polymerization process, which in turn reduces the response time and light scattering. We use Rayleigh-Gans-Debye scattering model to analyze the voltage-on state transmission spectra. When the domain size is comparable to the wavelength, the model fits with experimental results well. But when the domain size is smaller than the wavelength, the simple Rayleigh model works well.

© 2012 Optical Society of America

OCIS Codes
(120.5060) Instrumentation, measurement, and metrology : Phase modulation
(160.3710) Materials : Liquid crystals
(230.2090) Optical devices : Electro-optical devices
(230.3720) Optical devices : Liquid-crystal devices

ToC Category:
Optical Devices

Original Manuscript: July 12, 2012
Revised Manuscript: August 13, 2012
Manuscript Accepted: August 13, 2012
Published: August 17, 2012

Jie Sun, Yuan Chen, and Shin-Tson Wu, "Submillisecond-response and scattering-free infrared liquid crystal phase modulators," Opt. Express 20, 20124-20129 (2012)

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