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Two Methods for Modelling the Propagation of Terahertz Radiation in a Layered Structure

Authors
  • Walker, G.C.1
  • Berry, E.1
  • Smye, S.W.2
  • Zinov'ev, N.N.3
  • Fitzgerald, A.J.1
  • Miles, R.E.3
  • Chamberlain, M.3
  • Smith, M.A.1
  • 1 University of Leeds, Academic Unit of Medical Physics, UK
  • 2 Leeds Teaching Hospitals NHS Trust, Department of Medical Physics and Engineering, UK
  • 3 University of Leeds, Institute of Microwaves and Photonics, UK
Type
Published Article
Journal
Journal of Biological Physics
Publisher
Kluwer Academic Publishers
Publication Date
Jun 01, 2003
Volume
29
Issue
2-3
Pages
141–148
Identifiers
DOI: 10.1023/A:1024484523964
Source
Springer Nature
Keywords
License
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Abstract

Modelling the interaction of terahertz(THz) radiation with biological tissueposes many interesting problems. THzradiation is neither obviously described byan electric field distribution or anensemble of photons and biological tissueis an inhomogeneous medium with anelectronic permittivity that is bothspatially and frequency dependent making ita complex system to model.A three-layer system of parallel-sidedslabs has been used as the system throughwhich the passage of THz radiation has beensimulated. Two modelling approaches havebeen developed a thin film matrix model anda Monte Carlo model. The source data foreach of these methods, taken at the sametime as the data recorded to experimentallyverify them, was a THz spectrum that hadpassed though air only.Experimental verification of these twomodels was carried out using athree-layered in vitro phantom. Simulatedtransmission spectrum data was compared toexperimental transmission spectrum datafirst to determine and then to compare theaccuracy of the two methods. Goodagreement was found, with typical resultshaving a correlation coefficient of 0.90for the thin film matrix model and 0.78 forthe Monte Carlo model over the full THzspectrum. Further work is underway toimprove the models above 1 THz.

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