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Related Experiment Video

Updated: Jun 5, 2025

Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor
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High-sensitivity computational miniaturized terahertz spectrometer using a plasmonic filter array and a modified

Mengjuan Liu1, Meichen Yang2,3, Jiaqi Zhu1,2,3,4

  • 1Zhejiang Province Key Laboratory of Quantum Technology and Devices, School of Physics, and State Key Laboratory of Silicon and Advanced Semiconductor Materials, Zhejiang University, Hangzhou 310058, China.

Nanophotonics (Berlin, Germany)
|December 5, 2024
PubMed
Summary

We developed a compact terahertz (THz) spectrometer using a plasmonic filter and deep learning. This miniaturized THz spectrometer offers high sensitivity for portable applications.

Keywords:
adaptive deep-learning algorithmcomputational miniaturized terahertz spectrometerplasmonic filters

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Area of Science:

  • Optics and Photonics
  • Spectroscopy
  • Terahertz Technology

Background:

  • Miniaturized spectrometers are crucial for portable and handheld devices.
  • Limited progress exists in developing miniaturized spectrometers for the terahertz (THz) waveband.
  • Computational strategies offer a promising approach for spectrometer miniaturization.

Purpose of the Study:

  • To demonstrate a miniaturized computational terahertz spectrometer.
  • To utilize a plasmonic filter array and a blocked-impurity-band detector.
  • To develop an adaptive deep-learning algorithm for spectral reconstruction.

Main Methods:

  • A computational spectrometer design incorporating a plasmonic filter array.
  • A blocked-impurity-band detector to tailor spectral response.
  • An adaptive deep-learning algorithm for spectral reconstruction and error mitigation.

Main Results:

  • Achieved a spectral resolution of 2.3 cm⁻¹.
  • Demonstrated outstanding sensitivity with a signal-to-noise ratio of 6.4E6:1.
  • Outperformed common benchtop THz spectrometers in sensitivity.

Conclusions:

  • The integration of THz optical devices and reconstruction algorithms enables spectrometer miniaturization.
  • This approach provides a viable pathway for developing portable THz spectroscopy systems.
  • Expands the potential applications of terahertz spectroscopy.