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Optica Publishing Group
  • Chinese Optics Letters
  • Vol. 7,
  • Issue 8,
  • pp. 690-693
  • (2009)

Diffraction-induced edge contrast enhancement for terahertz imaging

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Abstract

Contrast enhancement is particularly important for imaging of weakly absorbing materials. We demonstrate the inherent contrast-enhancement effect at the edges of a transparent object by using a conventional pulsed terahertz imaging setup without additional modification of the system design. We provide both experimental and theoretical evidence suggesting that this effect is a consequence of the frequency-dependent energy loss of the terahertz radiation induced by edge diffraction. The influence of the phase step of the broadband terahertz pulses on the edge contrast is discussed.

© 2009 Chinese Optics Letters

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