Invited paper

Applied Physics B

, Volume 68, Issue 6, pp 1085-1094

First online:

Recent advances in terahertz imaging

  • D.M. MittlemanAffiliated withElectrical and Computer Engineering Department, Rice University, MS-366, 6100 Main St., Houston, TX 77005, USA (Fax: +1-713/524-5237, E-mail: daniel@rice.edu)
  • , M. GuptaAffiliated withElectrical and Computer Engineering Department, Rice University, MS-366, 6100 Main St., Houston, TX 77005, USA (Fax: +1-713/524-5237, E-mail: daniel@rice.edu)
  • , R. NeelamaniAffiliated withElectrical and Computer Engineering Department, Rice University, MS-366, 6100 Main St., Houston, TX 77005, USA (Fax: +1-713/524-5237, E-mail: daniel@rice.edu)
  • , R.G. BaraniukAffiliated withElectrical and Computer Engineering Department, Rice University, MS-366, 6100 Main St., Houston, TX 77005, USA (Fax: +1-713/524-5237, E-mail: daniel@rice.edu)
  • , J.V. RuddAffiliated withPicometrix, Inc., P.O. Box 130243, Ann Arbor, MI 48113, USA
  • , M. KochAffiliated withInstitut für Hochfrequenztechnik, Schleinitzstr. 22, Technical University of Braunschweig, D-38106 Braunschweig, Germany

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Abstract.

We review recent progress in the field of terahertz “T-ray” imaging. This relatively new imaging technique, based on terahertz time-domain spectroscopy, has the potential to be the first portable far-infrared imaging spectrometer. We give several examples which illustrate the possible applications of this technology, using both the amplitude and phase information contained in the THz waveforms. We describe the latest results in tomographic imaging, in which waveforms reflected from an object can be used to form a three-dimensional representation. Advanced signal processing tools are exploited for the purposes of extracting tomographic results, including spectroscopic information about each reflecting layer of a sample. We also describe the application of optical near-field techniques to the THz imaging system. Substantial improvements in the spatial resolution are demonstrated.

PACS: 07.57.Pt; 42.65.Re