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Development of a THz spectroscopic imaging system.

M Usami1, T Iwamoto, R Fukasawa

  • 1TOCHIGI Nikon Corporation, 770 Midori, Ohtawara, Tochigi 324-8625, Japan.

Physics in Medicine and Biology
|November 28, 2002
PubMed
Summary

We developed a real-time terahertz (THz) imaging system using 2D electro-optic (EO) sampling. This system achieves video-rate imaging and spectroscopic analysis of static and moving objects, including silicon wafers.

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Area of Science:

  • Optics and Photonics
  • Terahertz (THz) Technology
  • Spectroscopy

Background:

  • Traditional THz imaging often lacks real-time capabilities.
  • Achieving high spatial resolution in THz imaging is challenging.
  • Spectroscopic analysis in THz imaging requires specialized techniques.

Purpose of the Study:

  • To develop a real-time THz imaging system.
  • To achieve high spatial resolution and video-rate imaging.
  • To enable spectroscopic analysis of THz images.

Main Methods:

  • Utilized a two-dimensional (2D) electro-optic (EO) sampling technique.
  • Employed a CCD camera for image acquisition at up to 30 frames per second.
  • Collected time-domain images for spectroscopic information extraction.

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Main Results:

  • Achieved a spatial resolution of 1.4 mm, near the diffraction limit.
  • Demonstrated real-time imaging of both static and moving objects.
  • Successfully obtained spectroscopic images, demonstrated with silicon wafers.

Conclusions:

  • The developed 2D EO sampling THz imaging system offers real-time capabilities.
  • The system provides high spatial resolution and can perform spectroscopic analysis.
  • This technology has potential applications in material inspection and dynamic process monitoring.