Scalable integrated two-dimensional Fourier-transform spectrometry

Hongnan Xu (), Yue Qin, Gaolei Hu and Hon Ki Tsang ()
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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

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: 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.

Date: 2024
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DOI: 10.1038/s41467-023-44518-y

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