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Related Experiment Video

Updated: Jun 8, 2026

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
06:24

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal

Published on: October 31, 2019

30 to 50 ns liquid-crystal optical switches.

M W Geis1, T M Lyszczarz, R M Osgood

  • 1Lincoln Laboratory, Massachusetts Institute of Technology, Lexington, Massachusetts 02420-9108, USA. geis@ll.mit.edu

Optics Express
|October 14, 2010
PubMed
Summary

Fast optical switching times in liquid crystal cells are achievable, with transition times as low as 32 ns. Performance is influenced by voltage, temperature, and specific liquid crystal material properties.

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Physical Chemistry

Background:

  • Twisted-nematic liquid-crystal cells are crucial components in various optical devices.
  • Understanding their optical switching dynamics is essential for optimizing device performance.
  • Key parameters influencing switching time include temperature, bias voltage, and switching voltage.

Purpose of the Study:

  • To characterize the optical switching times of specific liquid crystal materials (5CB, 5OCB, PCH5).
  • To investigate the impact of temperature, bias voltage, and switching voltage on switching performance.
  • To determine the limiting factors for achieving faster switching speeds.

Main Methods:

  • Experimental characterization of optical switching times in twisted-nematic liquid-crystal cells.

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Related Experiment Videos

Last Updated: Jun 8, 2026

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
06:24

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal

Published on: October 31, 2019

An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation
10:33

An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation

Published on: February 27, 2019

Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets
06:26

Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets

Published on: May 15, 2017

  • Systematic variation of temperature, bias voltage, and switching voltage.
  • Measurement of transition time (90% to 10% transmission) and delay time.

    • Main Results:

    • Transition time scales approximately as V(-1.9) and is limited by the liquid-crystal breakdown electric field (~100 V μm(-1)) to 30-50 ns.
    • Delay time decreases with increasing bias and switching voltage, approaching a constant at higher fields (>10 V μm(-1)) for 5CB and 5OCB.
    • Both transition and delay times decrease with increasing temperature, with minimum transition times around 32 ns near the nematic-isotropic transition.

    Conclusions:

    • Optical switching times in twisted-nematic liquid-crystal cells are highly dependent on applied electric fields and temperature.
    • Specific liquid crystal materials like 5CB, 5OCB, and PCH5 exhibit distinct switching characteristics.
    • Achieving sub-50 ns switching times is feasible, with potential for further optimization through material selection and operating conditions.