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Glass-in-glass infiltration for 3D micro-optical composite components.

Enrico Casamenti, Gözden Torun, Luciano Borasi

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    Researchers developed a new method to create 3D chalcogenide-silica micro-glass composites. This technique overcomes the material

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    Area of Science:

    • Materials Science
    • Optical Engineering
    • Nanotechnology

    Background:

    • Chalcogenide glass offers a wide infrared transmission window, high refractive index, and nonlinear optical properties.
    • Poor mechanical properties and stability hinder the creation of 3D chalcogenide glass microstructures.

    Purpose of the Study:

    • To develop a method for fabricating complex 3D chalcogenide-silica micro-glass composites.
    • To overcome the limitations of traditional chalcogenide glass processing for 3D structures.

    Main Methods:

    • Fabrication of 3D fused silica molds using femtosecond laser-assisted chemical etching.
    • Pressure-assisted infiltration of chalcogenide glass into the silica molds.

    Main Results:

    • Successfully created geometrically complex 3D chalcogenide-silica micro-glass composites.
    • Achieved high refractive index contrast enabling total-internal-reflection guiding.
    • Demonstrated optical quality surface roughness suitable for infrared applications.

    Conclusions:

    • The combined laser etching and infiltration method enables the fabrication of advanced 3D chalcogenide-silica microstructures.
    • The resulting composites are promising for infrared optical applications requiring total-internal-reflection guiding.