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Real-Time High Resolution THz Imaging with a Fiber-Coupled Photo Conductive Antenna and an Uncooled Microbolometer

Peter Zolliker1, Mostafa Shalaby2, Elisa Söllinger2

  • 1Transport at Nanoscale Interfaces Laboratory, Empa, Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, 8600 Dübendorf, Switzerland.

Sensors (Basel, Switzerland)
|June 2, 2021
PubMed
Summary

We developed a real-time terahertz (THz) imaging system using a compact THz source and sensitive camera. This adaptable system achieves nine frames per second for material science and security applications.

Keywords:
THz imagingTHz-TDSmicrobolometer cameraphoto conductive antennareal-time

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Area of Science:

  • Terahertz (THz) imaging
  • Optoelectronics
  • Non-destructive testing

Background:

  • Traditional THz imaging systems can be bulky and require specialized cooling.
  • Advancements in component miniaturization and sensitivity are crucial for practical THz applications.

Purpose of the Study:

  • To present a novel, real-time THz imaging method.
  • To demonstrate the adaptability and potential of a compact, uncooled THz imaging system.

Main Methods:

  • Utilized a commercial fiber-coupled photoconductive antenna as the THz source.
  • Employed an uncooled microbolometer camera for high-sensitivity detection.
  • Configured the system for transmission geometry imaging.

Main Results:

  • Achieved real-time THz imaging at a rate of nine frames per second.
  • Successfully measured the beam shape of a THz Time Domain Spectrometer.
  • Demonstrated the capability to resolve hidden items, complex structures, and moisture content in materials.

Conclusions:

  • The developed THz imaging system offers a flexible and adaptable solution for real-time imaging.
  • The system shows significant potential for practical applications in material science, security, and beyond.
  • Future work could explore reflection geometry and multi-spectral imaging capabilities.