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In signal processing, bandpass sampling is an effective technique for sampling signals that have most of their energy concentrated within a narrow frequency band. This type of signal is known as a bandpass signal. The key principle of bandpass sampling involves sampling the signal at a rate that is greater than twice the signal's bandwidth to prevent aliasing.
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    Area of Science:

    • Optics and Photonics
    • Materials Science

    Background:

    • Near-infrared (IR) spectroscopy requires precise wavelength selection.
    • Existing bandpass filters often lack angular tunability or broad rejection bands.

    Purpose of the Study:

    • To design and experimentally demonstrate an angularly tunable near-infrared bandpass filter.
    • To achieve high transmission, narrow bandwidth (<20 nm), and a broad rejection band (350-1100 nm).

    Main Methods:

    • Design procedure for a bandpass filter.
    • Fabrication using plasma-enhanced reactive magnetron sputtering.
    • Characterization using a custom optical system.

    Main Results:

    • Demonstrated an angularly tunable filter (0-50°) with a central wavelength shift from 970 nm to 880 nm.
    • Achieved high transmission and bandwidth below 20 nm.
    • Maintained spectral shape and bandwidth for unpolarized light across the tunable range.

    Conclusions:

    • The developed filter meets key performance metrics for near-IR applications.
    • Plasma-enhanced reactive magnetron sputtering is a viable method for fabricating such filters.
    • The filter's angular tunability offers flexibility in optical system design.