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Compact silicon multimode waveguide spectrometer with enhanced bandwidth.

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  • 1Technical University of Denmark, Department of Photonics Engineering, Kgs. Lyngby, 2800, Denmark.

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Researchers developed a compact spectrometer using a multimode waveguide. This innovative spectrometer achieves high resolution and broad bandwidth, overcoming fabrication challenges for advanced sensing applications.

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Area of Science:

  • Photonics and Optical Engineering
  • Integrated Optics
  • Spectroscopy

Background:

  • Compact, broadband, and high-resolution spectrometers are crucial for various sensing applications.
  • Fabricating such spectrometers with desired performance metrics remains a significant challenge.

Purpose of the Study:

  • To demonstrate a novel spectrometer design overcoming traditional limitations in bandwidth and resolution.
  • To present a compact, high-performance spectrometer suitable for sensing applications.

Main Methods:

  • Utilizing a multimode waveguide as the core component of the spectrometer.
  • Employing an on-chip mode-exciting element to control and enhance mode excitation.
  • Leveraging calibration data to validate spectrometer performance.

Main Results:

  • Achieved a spectral resolution of 2 GHz and a bandwidth of 250 GHz.
  • The spectrometer boasts a compact footprint of 1.6 mm x 2.1 mm.
  • The mode-exciting element increased spectral channels by exciting distinct mode collections, extending the usable range.

Conclusions:

  • The developed multimode waveguide spectrometer offers a promising solution for compact, high-performance spectral analysis.
  • This approach significantly enhances the number of independent spectral channels, enabling broader spectral range utilization.
  • The demonstrated technology has potential implications for miniaturized sensing systems and optical communications.