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

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Optically switchable, rapidly relaxing cholesteric liquid crystal reflectors.

Uladzimir A Hrozhyk¹, Svetlana V Serak, Nelson V Tabiryan

¹Beam Engineering for Advanced Measurements Co., 809 South Orlando Avenue, Suite I, Winter Park, FL, USA.

|July 1, 2010

Summary

This study demonstrates fast, reversible, all-optical switching of cholesteric liquid crystal (CLC) reflection using push-pull azobenzene dyes. These photosensitive CLC compositions enable rapid optical switching and restoration of reflection states.

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Area of Science:

Materials Science
Optics
Photochemistry

Background:

Cholesteric liquid crystals (CLCs) exhibit unique optical properties, including selective reflection of light.
All-optical switching offers potential for advanced photonic devices but often faces limitations in speed and reversibility.
Azobenzene dyes are known photosensitive molecules that undergo reversible cis-trans isomerization upon light exposure.

Purpose of the Study:

To demonstrate reversible, fast, all-optical switching of CLC reflection.
To investigate the use of push-pull azobenzene dyes for enhancing switching speed and reversibility in CLCs.
To explore optical switching using various laser sources, including continuous wave (CW) and pulsed lasers.

Main Methods:

Formulating cholesteric liquid crystals doped with push-pull azobenzene dyes.
Exposing the photosensitive CLC compositions to CW lasers (488 nm and 532 nm) and ns pulsed 532 nm irradiation.
Measuring the switching times and reversibility of the CLC reflection upon laser exposure and cessation.

Main Results:

Achieved reversible, all-optical switching of CLC reflection.
Demonstrated rapid optical switching within hundreds of milliseconds for CW laser exposure.
Observed optical switching on the order of tens of nanoseconds with ns pulsed laser irradiation.
Utilized the rapid cis-trans isomerization of azobenzene dyes to restore CLC reflection from a photoinduced isotropic state within seconds.

Conclusions:

Push-pull azobenzene dyes enable unprecedented fast, reversible, all-optical switching of cholesteric liquid crystal reflection.
The developed photosensitive CLC formulations are promising for applications in optical switching and photonic devices.
The rapid photoisomerization mechanism offers a new pathway for controlling liquid crystal optical properties.