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Scalable integrated two-dimensional Fourier-transform spectrometry.

Hongnan Xu1, Yue Qin2, Gaolei Hu2

  • 1Department of Electronic Engineering, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, China. hongnanxu@cuhk.edu.hk.

Nature Communications
|January 10, 2024
PubMed
Summary
This summary is machine-generated.

This study introduces a two-dimensional Fourier-transform spectrometer (2D-FTS) to overcome resolution-bandwidth trade-offs in integrated spectrometers. The novel 2D-FTS achieves high spectral resolution and broad bandwidth, enhancing portability for scientific research.

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Area of Science:

  • Optics and Photonics
  • Spectroscopy
  • Instrumental Science

Background:

  • Integrated spectrometers, particularly Fourier-transform spectrometers (FTS), offer portability but face resolution-bandwidth trade-offs.
  • Existing FTS designs limit simultaneous high resolution and broad spectral coverage.

Purpose of the Study:

  • To propose and demonstrate a two-dimensional Fourier-transform spectrometer (2D-FTS) to overcome the resolution-bandwidth limitation.
  • To enhance the scalability and performance of integrated spectrometers.

Main Methods:

  • Utilized a 2D Fourier transform for spectral reconstruction instead of a 1D Fourier transform.
  • Combined a tunable FTS with a spatial heterodyne spectrometer to create a 2D interferogram pattern.
  • Mapped wavelengths to a 2D Fourier map, extending beyond the free-spectral-range limit.

Main Results:

  • Demonstrated a spectral resolution of 250 pm over a 200-nm bandwidth at the Rayleigh criterion.
  • Achieved enhanced resolution of 125 pm through computational methods.
  • The 2D-FTS design circumvents the traditional trade-off between spectral resolution and bandwidth.

Conclusions:

  • The proposed 2D-FTS concept successfully addresses the resolution-bandwidth trade-off in integrated spectrometers.
  • This technology offers improved scalability and performance for portable spectroscopic applications.
  • The 2D-FTS paves the way for advanced integrated spectroscopic instruments in various scientific fields.