Ultra-simplified diffraction-based computational spectrometer

Chuangchuang Chen; Honggang Gu; Shiyuan Liu

doi:10.1038/s41377-023-01355-4

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Ultra-simplified diffraction-based computational spectrometer

Original Articles

- Ultra-simplified diffraction-based computational spectrometer
- Light: Science & Applications Vol. 13, Issue 6, Pages: 1022-1031(2024)
- Affiliations：
  
  1.State Key Laboratory of Intelligent Manufacturing Equipment and Technology, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
  2.Optics Valley Laboratory, Wuhan, Hubei 430074, China
- Author bio：
  
  Honggang Gu (hongganggu@hust.edu.cn)
  Shiyuan Liu (shyliu@hust.edu.cn)
- Funds：
- DOI：10.1038/s41377-023-01355-4
  CLC：
- Received：13 August 2023，
  
  Revised：07 December 2023，
  
  Accepted：2023-12-08，
  
  Published Online：05 January 2024，
  
  Published：30 June 2024
- Accepted：
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Chen, C. C., Gu, H. G. & Liu, S. Y. Ultra-simplified diffraction-based computational spectrometer. Light: Science & Applications, 13, 1022-1031 (2024).
DOI：

Chen, C. C., Gu, H. G. & Liu, S. Y. Ultra-simplified diffraction-based computational spectrometer. Light: Science & Applications, 13, 1022-1031 (2024). DOI： 10.1038/s41377-023-01355-4.

摘要

Abstract

Miniaturizing spectrometers for compact and cost-effective mobile platforms is a major challenge in current spectroscopy research

where conventional spectrometers are impractical due to their bulky footprint. Existing miniaturized designs primarily rely on precalibrated response functions of nanophotonic structures to encode spectral information captured in a snapshot by detector arrays. Accurate spectrum reconstruction is achieved through computational techniques

but this requires precise component design

high-precision fabrication

and calibration. We propose an ultra-simplified computational spectrometer that employs a one-to-broadband diffraction decomposition strategy facilitated by a numerical regularized transform that depends only on the spectrum of the diffracted radiation. The key feature of our design is the use of a simple

arbitrarily shaped pinhole as the partial disperser

eliminating the need for complex encoding designs and full spectrum calibration. Our spectrometer achieves a reconstructed spectral peak location accuracy of better than 1 nm over a 200 nm bandwidth and excellent resolution for peaks separated by 3 nm in a bimodal spectrum

all within a compact footprint of under half an inch. Notably

our approach also reveals a breakthrough in broadband coherent diffractive imaging without requiring any

prior

knowledge of the broadband illumination spectrum

assumptions of non-dispersive specimens

or correction for detector quantum efficiency.

关键词

Keywords

references

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