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X-ray Crystallography02:18

X-ray Crystallography

The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
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Patterning via Optical Saturable Transitions - Fabrication and Characterization
08:19

Patterning via Optical Saturable Transitions - Fabrication and Characterization

Published on: December 11, 2014

Single-step photopatterning of diffraction.

Dong Jun Kang, Jang-Ung Park, Byeong-Soo Bae

    Optics Express
    |May 26, 2009
    PubMed
    Summary
    This summary is machine-generated.

    New hybrid materials exhibit significant photoinduced negative refractive-index changes and volume changes. Direct laser writing of diffraction gratings was achieved without etching, demonstrating potential for optical device fabrication.

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    Area of Science:

    • Materials Science
    • Optics
    • Nanotechnology

    Background:

    • Sol-gel processing enables the creation of inorganic-organic hybrid materials with unique optical properties.
    • Photoinduced refractive index changes are crucial for developing advanced optical components.
    • Direct laser writing offers a maskless fabrication route for micro- and nanostructures.

    Purpose of the Study:

    • To investigate the photoinduced optical and volume changes in sol-gel derived inorganic-organic hybrid materials.
    • To fabricate diffraction gratings directly using laser irradiation without etching.
    • To analyze the influence of irradiation conditions on diffraction efficiency.

    Main Methods:

    • Preparation of inorganic-organic hybrid materials via sol-gel synthesis.
    • Direct laser writing of diffraction gratings using a KrF excimer laser (248 nm) and a phase mask.
    • Characterization of diffraction efficiency using a He-Ne laser (633 nm) in a Littrow configuration.

    Main Results:

    • The hybrid materials demonstrated a large photoinduced negative refractive-index change of 2x10^-2.
    • A significant volume change was observed concurrently with the refractive index change.
    • Maximum diffraction efficiency of 3.4% in reflection mode was achieved.
    • Irradiation conditions were found to influence the diffraction efficiency.

    Conclusions:

    • Sol-gel derived inorganic-organic hybrid materials are suitable for direct laser writing of diffraction gratings.
    • The observed photoinduced effects enable maskless fabrication of optical elements.
    • These materials hold promise for applications in integrated optics and photonic devices.