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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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High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
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Liquid-crystal-based switchable polarizers for sensor protection.

C S Wu, S T Wu

    Applied Optics
    |November 10, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Two switchable polarizers protect sensors. One offers high efficiency and extinction ratio but a narrow field of view, while the other provides a wider field of view with lower performance. Both are crucial for advanced optical sensor protection.

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    Area of Science:

    • Optics and Photonics
    • Materials Science

    Background:

    • Linear polarizers are vital for protecting human eyes and optical sensors, often used with liquid-crystal filters.
    • Optimizing sensor detection requires polarizers to be clear with minimal insertion loss during no-threat conditions.
    • During threat detection, polarizers must rapidly switch to a linear polarizer state with a high extinction ratio.

    Purpose of the Study:

    • To demonstrate and compare two types of switchable polarizers for advanced sensor protection applications.
    • To evaluate their performance in terms of optical efficiency, extinction ratio, switching speed, and field of view.

    Main Methods:

    • Demonstration of a polarization conversion type switchable polarizer.
    • Development and testing of an improved switchable dichroic polarizer.
    • Comparative analysis of optical and performance characteristics for both polarizer types.

    Main Results:

    • The polarization conversion type offers high optical efficiency in its clear state, a high extinction ratio when polarized, and fast switching, but has a limited field of view (±10°).
    • The improved switchable dichroic polarizer operates effectively over a much wider field of view.
    • The dichroic polarizer exhibits lower extinction ratio and clear-state optical efficiency compared to the polarization conversion type.

    Conclusions:

    • Both demonstrated switchable polarizers offer viable solutions for sensor protection, each with distinct advantages and limitations.
    • The choice between the polarization conversion and dichroic types depends on the specific application's requirements regarding field of view versus optical performance.
    • Further research may focus on optimizing the dichroic polarizer's performance or expanding the polarization conversion type's field of view.