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THz interferometric imaging using subwavelength plastic fiber based THz endoscopes.

Ja-Yu Lu1, Chung-Chiu Kuo, Chui-Min Chiu

  • 1Department of Electrical Engineering and Graduate Institute of Photonics and Optoelectronics, National Taiwan University, Taipei, 10617, Taiwan.

Optics Express
|June 11, 2008
PubMed
Summary

We developed a novel terahertz (THz) fiber-endoscopy technique for reflective imaging. This method achieves high-resolution 3D imaging of samples using subwavelength plastic fibers and Fabry Perot interference.

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Area of Science:

  • Optics and Photonics
  • Terahertz (THz) Imaging
  • Fiber Optics

Background:

  • Traditional THz imaging often requires bulky focusing optics.
  • Subwavelength fiber technology offers potential for miniaturized THz systems.
  • Fabry Perot interference is a known optical phenomenon exploitable for sensing.

Purpose of the Study:

  • To demonstrate a new reflective imaging technique using continuous-wave THz fiber-endoscopy.
  • To achieve 3D THz reflective imaging with high resolution without external focusing.
  • To reconstruct THz reflection amplitudes and phases from sample surfaces.

Main Methods:

  • Utilized continuous-wave THz radiation coupled into a subwavelength plastic fiber.
  • Formed Fabry Perot interference between the fiber output and the sample surface.
  • Acquired 3D images by axial sample movement and 2D fiber output scanning.
  • Analyzed axial-position dependent THz signals for amplitude and phase reconstruction.

Main Results:

  • Successfully acquired 3D THz reflective images with good signal-to-noise ratio (SNR).
  • Achieved high lateral and subwavelength axial resolutions.
  • Reconstructed THz reflection amplitudes and phases on the sample surface without a focusing medium.

Conclusions:

  • Continuous-wave THz fiber-endoscopy is a viable technique for high-resolution reflective imaging.
  • The demonstrated method eliminates the need for focusing optics in THz imaging.
  • This technique enables detailed surface characterization of samples in the THz domain.