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Related Concept Videos

Dielectric Polarization in a Capacitor01:31

Dielectric Polarization in a Capacitor

The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
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Related Experiment Video

Updated: Jun 6, 2026

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

Ferroelectric liquid-crystal waveguide modulation based on a switchable uniaxial-uniaxial interface.

D B Walker, E N Glytsis, T K Gaylord

    Applied Optics
    |November 19, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Ferroelectric liquid crystals offer a promising alternative for active waveguide modulators, overcoming the high scattering losses seen in nematic liquid crystals. This research explores their potential in practical optical devices.

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    Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
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    Published on: February 27, 2019

    Related Experiment Videos

    Last Updated: Jun 6, 2026

    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

    Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
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    Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals

    Published on: August 15, 2018

    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

    Area of Science:

    • Photonics and Optoelectronics
    • Materials Science
    • Integrated Optics

    Background:

    • Liquid crystals possess superior electro-optic coefficients compared to traditional materials like lithium niobate.
    • Nematic liquid crystals, while studied for waveguides, suffer from significant scattering losses.
    • Smectic liquid crystals and confined liquid crystals show potential for reduced optical losses.

    Purpose of the Study:

    • To investigate the feasibility of ferroelectric liquid crystals (FLCs) for active waveguide modulators.
    • To analyze various modulator configurations, including cutoff, deflection, and input coupler designs.
    • To develop and apply a mode-matching technique for analyzing waveguide discontinuities.

    Main Methods:

    • A novel mode-matching technique was developed to analyze discontinuities in uniaxial slab waveguides.
    • The optic axis orientation within the waveguide plane was considered.
    • Results from the mode-matching technique were validated against simple bulk models.

    Main Results:

    • Ferroelectric liquid crystals demonstrate significant potential for waveguide modulator applications.
    • The analyzed modulator configurations show desirable performance characteristics.
    • The mode-matching technique provides an effective method for analyzing such structures.

    Conclusions:

    • Ferroelectric liquid crystals are a viable candidate for next-generation active waveguide modulators.
    • The developed analytical techniques support the design and optimization of FLC-based devices.
    • FLC modulators could lead to practical and high-performance integrated optical systems.