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Photomechanical meta-molecule array for real-time terahertz imaging.

Yongzheng Wen1,2, Delin Jia1, Wei Ma1

  • 1National Key Laboratory of Science and Technology on Micro/Nano Fabrication, Institute of Microelectronics, Peking University, Beijing 100871, China.

Microsystems & Nanoengineering
|May 7, 2019
PubMed
Summary

This study introduces a novel photomechanical meta-molecule array for efficient terahertz (THz) imaging. This device enables real-time THz and infrared imaging with high sensitivity, overcoming limitations of current technologies.

Keywords:
bi-material cantilevermeta-atom absorberphotomechanical meta-molecule arraypolyimide sacrificial layer techniqueterahertz imaging

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Mechanical Engineering

Background:

  • Real-time terahertz (THz) imaging is crucial for security and medical applications.
  • Current THz detectors often require scanners, leading to long acquisition times.
  • Existing real-time thermal detectors lack sensitivity due to poor absorbing materials.

Purpose of the Study:

  • To develop a novel photomechanical meta-molecule array for efficient real-time THz imaging.
  • To overcome the sensitivity and speed limitations of existing THz detection methods.

Main Methods:

  • Assembled THz meta-atom absorbers with bi-material cantilevers to create a photomechanical meta-molecule array.
  • Utilized a polyimide sacrificial layer technique for device fabrication on a glass wafer.
  • Employed optical readout of mechanical deflections for simultaneous data acquisition.

Main Results:

  • Achieved efficient coupling of THz radiation to mechanical deflection.
  • Demonstrated real-time THz imaging of various objects.
  • Successfully captured infrared images of the human body.

Conclusions:

  • The proposed photomechanical device enables high-efficiency, real-time THz and infrared imaging.
  • This technology holds significant promise for security, medical imaging, and broadband THz applications.