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    A novel integrated spectrometer on a chip uses stationary wave integrated Fourier transform spectrometer (SWIFTS) technology for compact, high-resolution measurements in the short-wave infrared spectrum.

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    Area of Science:

    • Photonics and Optical Engineering
    • Integrated Optics
    • Spectroscopy

    Background:

    • Traditional spectrometers often rely on bulky optical components, limiting miniaturization and stability.
    • Integrated waveguide technology offers a path towards compact and robust optical systems.
    • Fourier transform spectroscopy provides high spectral resolution but can be complex to implement in integrated formats.

    Purpose of the Study:

    • To present a monolithic spectrometer device utilizing integrated waveguide technology.
    • To demonstrate the stationary wave integrated Fourier transform spectrometer (SWIFTS) technology for short-wave infrared applications.
    • To showcase a compact and stable spectrometer without traditional optical lens interposers.

    Main Methods:

    • Development of a spectrometer on a glass chip using integrated waveguide technology.
    • Implementation of stationary wave integrated Fourier transform spectrometer (SWIFTS) principles.
    • Utilizing nanoscale antennas to sample stationary waves within a surface-integrated waveguide.
    • Employing an optimized data reduction method to enhance spectral resolution and mitigate aliasing.

    Main Results:

    • Achieved a spectral resolution of <300 pm over a 2560 μm waveguide length.
    • Demonstrated a 7 nm repetitive spectral bandwidth with a 60 μm sampling period.
    • Showcased a wavelength-meter configuration with 50 pm spectral resolution over a 14 nm range.
    • The multi-nanowire antenna design enabled a compact and stable system, eliminating bulky optics.

    Conclusions:

    • The presented SWIFTS device represents a significant advancement in integrated spectrometer technology.
    • The monolithic design on a glass chip offers a compact, stable, and lens-free solution.
    • This work paves the way for future development of more sophisticated and efficient integrated spectrometers.