Terahertz imaging with a time-reversed finite difference time-domain method

BARDAK C., Zhu Y., Bernussi A. A., Saed M.

IEEE Transactions on Terahertz Science and Technology, vol.4, no.2, pp.240-246, 2014 (SCI-Expanded, Scopus) identifier identifier

  • Publication Type: Article / Article
  • Volume: 4 Issue: 2
  • Publication Date: 2014
  • Doi Number: 10.1109/tthz.2014.2303788
  • Journal Name: IEEE Transactions on Terahertz Science and Technology
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.240-246
  • Keywords: Finite difference time-domain (FDTD), image reconstruction, terahertz (THz) imaging, time reversal
  • Manisa Celal Bayar University Affiliated: Yes

Abstract

A novel approach to three-dimensional terahertz (THz) imaging based on a time-reversed finite difference time-domain (FDTD) method is presented. Time-reversed convolutional perfectly matching layers (CPML) were implemented as boundaries to truncate the simulation domain. The proposed computationally efficient technique is capable of producing detailed images using a much smaller set of measured data compared to conventional terahertz imaging methods. A coarser grid of transmitter/receiver locations is needed, saving significant data acquisition time. Transmission and reflection imaging configurations in far-field were investigated. Simulations as well as experimental results, including comparisons with conventional methods, are presented. Our approach was validated experimentally using a time-domain terahertz measurement system. © 2011-2012 IEEE.