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Related Experiment Video

Updated: Jun 16, 2026

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

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Published on: February 27, 2019

Lightguiding in photochromic glasses.

J D Crow, N F Borrelli, T P Seward Iii

    Applied Optics
    |February 6, 2010
    PubMed
    Summary

    Researchers demonstrated lightguiding in photochromic glass. They controlled light attenuation using UV and visible light, achieving rapid switching speeds for optical applications.

    Area of Science:

    • Materials Science
    • Optics
    • Photonics

    Background:

    • Photochromic materials change optical properties upon light exposure.
    • Ion-exchanged glass is a promising substrate for optical devices.

    Purpose of the Study:

    • To investigate lightguiding properties in ion-exchanged photochromic glass.
    • To demonstrate controllable attenuation of light within these guides.

    Main Methods:

    • Fabrication of photochromic glass layers via ion exchange (Ag+ for Na+ or F- outdiffusion).
    • Characterization of lightguiding properties and attenuation.
    • Dynamic control of attenuation using UV (darkening) and visible (bleaching) light.

    Main Results:

    • Achieved low guide attenuation (< 0.2 dB/cm) in ion-exchanged glass.

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  • Demonstrated variable attenuation up to 30 dB/cm.
  • Observed switching times on the order of seconds for darkening and bleaching.

    • Conclusions:

    • Ion-exchanged photochromic glass supports efficient lightguiding.
    • Light-induced modulation of attenuation is feasible with rapid switching.
    • Potential for applications in optical switching and modulation.