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High-efficiency fused-silica reflection grism.

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    A novel fused-silica reflection grism utilizing total internal reflection (TIR) was designed and fabricated. This TIR grating achieves over 99% theoretical and 95% experimental diffraction efficiency for TM-polarized waves.

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    Area of Science:

    • Optics and Photonics
    • Nanofabrication

    Background:

    • Reflection gratings and prisms are essential optical components.
    • Total internal reflection (TIR) offers efficient light manipulation.
    • Integrating gratings and prisms can enhance optical device performance.

    Purpose of the Study:

    • To design and fabricate a fused-silica reflection grism.
    • To leverage total internal reflection (TIR) for grating functionality.
    • To achieve high diffraction efficiency in a compact device.

    Main Methods:

    • Rigorous coupled-wave analysis (RCWA) for grating profile optimization.
    • Two-beam interference lithography for precise grating fabrication.
    • Inductively coupled plasma (ICP) etching for fused-silica microstructuring.

    Main Results:

    • Theoretical diffraction efficiency exceeding 99% for TM-polarized waves at 980 nm.
    • Experimental demonstration of diffraction efficiencies greater than 95%.
    • Simplified device architecture by direct etching of the TIR grating into the prism.

    Conclusions:

    • The developed fused-silica reflection grism offers high performance.
    • Direct etching of TIR gratings simplifies fabrication and integration.
    • This technology has potential applications in various optical systems requiring efficient beam manipulation.