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Scalable integrated two-dimensional Fourier-transform spectrometry

Author

Listed:
  • Hongnan Xu

    (The Chinese University of Hong Kong)

  • Yue Qin

    (The Chinese University of Hong Kong)

  • Gaolei Hu

    (The Chinese University of Hong Kong)

  • Hon Ki Tsang

    (The Chinese University of Hong Kong)

Abstract

Integrated spectrometers offer the advantages of small sizes and high portability, enabling new applications in industrial development and scientific research. Integrated Fourier-transform spectrometers (FTS) have the potential to realize a high signal-to-noise ratio but typically have a trade-off between the resolution and bandwidth. Here, we propose and demonstrate the concept of the two-dimensional FTS (2D-FTS) to circumvent the trade-off and improve scalability. The core idea is to utilize 2D Fourier transform instead of 1D Fourier transform to rebuild spectra. By combining a tunable FTS and a spatial heterodyne spectrometer, the interferogram becomes a 2D pattern with variations of heating power and arm lengths. All wavelengths are mapped to a cluster of spots in the 2D Fourier map beyond the free-spectral-range limit. At the Rayleigh criterion, the demonstrated resolution is 250 pm over a 200-nm bandwidth. The resolution can be enhanced to 125 pm using the computational method.

Suggested Citation

  • Hongnan Xu & Yue Qin & Gaolei Hu & Hon Ki Tsang, 2024. "Scalable integrated two-dimensional Fourier-transform spectrometry," Nature Communications, Nature, vol. 15(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-023-44518-y
    DOI: 10.1038/s41467-023-44518-y
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    References listed on IDEAS

    as
    1. Mario C. M. M. Souza & Andrew Grieco & Newton C. Frateschi & Yeshaiahu Fainman, 2018. "Fourier transform spectrometer on silicon with thermo-optic non-linearity and dispersion correction," Nature Communications, Nature, vol. 9(1), pages 1-8, December.
    2. Derek M. Kita & Brando Miranda & David Favela & David Bono & Jérôme Michon & Hongtao Lin & Tian Gu & Juejun Hu, 2018. "High-performance and scalable on-chip digital Fourier transform spectroscopy," Nature Communications, Nature, vol. 9(1), pages 1-7, December.
    3. S. N. Zheng & J. Zou & H. Cai & J. F. Song & L. K. Chin & P. Y. Liu & Z. P. Lin & D. L. Kwong & A. Q. Liu, 2019. "Microring resonator-assisted Fourier transform spectrometer with enhanced resolution and large bandwidth in single chip solution," Nature Communications, Nature, vol. 10(1), pages 1-8, December.
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