THz reflection spectroscopy of C-4 explosive and its detection through interferometric imaging

Amartya Sengupta, Aparajita Bandyopadhyay, Robert Barat, Dale Gary, John Federici

Research output: Chapter in Book/Report/Conference proceedingConference contribution

9 Scopus citations


In recent times, Terahertz (1 THz = 10 12 cycles/sec and 300 μm in wavelength) spectroscopy has become a promising technique for spectroscopic identification of different materials having contemporary interest. In this study we report a direct measurement of reflection spectra of the explosive C-4, which shows significant absorption around 0.8 THz, using THz time domain spectroscopic techniques. A contrast in reflection of around 8% has also been observed between the neighboring frequencies of 0.7 THz and 0.9 THz. The spectral data have been used to create realistic synthetic images for use in simulations of interferometric detection in a stand-off THz imaging system. The results obtained are analyzed using Artificial Neural Networks for positive identification of the agents with an interferometric array of few linear detectors in near field mode.

Original languageEnglish (US)
Title of host publicationTerahertz and Gigahertz Electronics and Photonics V
StatePublished - 2006
EventTerahertz and Gigahertz Electronics and Photonics V - San Jose, CA, United States
Duration: Jan 25 2006Jan 26 2006

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


OtherTerahertz and Gigahertz Electronics and Photonics V
Country/TerritoryUnited States
CitySan Jose, CA

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


  • Characterization
  • Interferometric Detection
  • Lethal Agents
  • Reflection Spectra
  • THz Imaging
  • THz Spectroscopy


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