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Related Concept Videos

Types of Reversible Electrodes01:24

Types of Reversible Electrodes

For electrode reversibility to be maintained, all the reactants and products involved in the half-reaction must be present at the electrode. There are several types of reversible electrodes (half-cells).In metal-metal-ion electrodes, a metal balances electrochemically with a solution of its own ions. Examples are Cu2+|Cu and Zn2+|Zn. Metals that react with the solvent, like group 1 and most group 2 metals, which react with water, and zinc, which reacts with aqueous acidic solutions, cannot be...

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Electrically switchable cholesteric gratings based on slit electrodes.

Chie-Tong Kuo, Ru-Hsien Chiang, Chun-Yen Wang

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    |May 3, 2014
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    This study demonstrates an electrically switchable diffraction grating (ESDG) using cholesteric liquid crystals (CLCs). The device electrically swaps first and second order diffraction efficiencies by altering liquid crystal textures with applied voltage.

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    Area of Science:

    • Optoelectronics
    • Materials Science
    • Physics

    Background:

    • Diffraction gratings are optical components used to diffract light into several beams.
    • Electrically switchable devices offer dynamic control over optical properties.

    Purpose of the Study:

    • To demonstrate an electrically switchable diffraction grating (ESDG) using cholesteric liquid crystals (CLCs).
    • To investigate the electrical control of diffraction orders and efficiencies in the CLC-based ESDG.

    Main Methods:

    • Fabrication of an ESDG using a cell with slit electrodes filled with CLC material.
    • Applying varying low and high voltages to induce different CLC textures (planar, fingerprint, homeotropic).
    • Measuring the first and second order diffraction efficiencies at different applied voltages.

    Main Results:

    • The ESDG exhibits high second order diffraction efficiency at low voltage due to alternating planar and fingerprint textures.
    • The ESDG shows high first order diffraction efficiency at high voltage due to alternating planar and homeotropic textures.
    • The first and second order diffraction efficiencies are electrically swapped, with a maximum efficiency of approximately 32% in each mode.

    Conclusions:

    • An effective electrically switchable diffraction grating based on CLCs has been demonstrated.
    • The device allows for electrical switching between high first and second order diffraction efficiencies.
    • This technology holds potential for tunable optical components and displays.