Laser & Optoelectronics Progress, Volume. 60, Issue 18, 1811015(2023)
Novel Terahertz Spectrum-Measurement Method Based on Spectral Encoding
In order to improve the transient performance and system integration level of terahertz spectral analysis, this study proposes a novel terahertz spectrum-measurement method that combines metasurface spectral encoding and computational reconstruction. High-random spectral encoding of incident terahertz waves is achieved using spectral encoder devices that utilize multiple metasurface structures. Furthermore, a sparse recovery algorithm based on dictionary learning is developed to accurately restore the spectrum. Theoretical calculations and numerical simulations demonstrate that under a 4% noise level, the proposed method achieves a reconstruction error of less than 3% for the lactose transmission spectrum. Thus, the proposed method provides a new pathway for developing on-chip integrated terahertz spectrometers.
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Meng Chen, Ziran Zhao, Ruifeng Liu, Yingxin Wang. Novel Terahertz Spectrum-Measurement Method Based on Spectral Encoding[J]. Laser & Optoelectronics Progress, 2023, 60(18): 1811015
Category: Imaging Systems
Received: Jun. 2, 2023
Accepted: Aug. 1, 2023
Published Online: Sep. 19, 2023
The Author Email: Zhao Ziran (zhaozr@mail.tsinghua.edu.cn)