Scattering of terahertz radiation in thin layers of dielectric materials

Scattering of THz radiation in inhomogeneous media is an important reason of reducing spectral information in received THz signal for different applications. Scattering of THz radiation in thin layers of dielectric material was studied, particularly, in fabric materials. A structure of different types of cloth fabric was studied, and mathematical model of fabric was suggested, which is a system of dielectric cylinders. Scattering of THz radiation was modeled numerically. Scattering cross-section and indicatrix were calculated, and then spectral transmittance was computed. During a set of experiments THz spectral transmittance of various fabric materials were obtained and numerical results were approved. The developed method for receiving scattering characteristics of different materials can be used for extracting useful information from received THz signal.

[1]  M. J. Fitch,et al.  Wideband terahertz spectroscopy of explosives , 2007 .

[2]  G. Bastiaans,et al.  Absorption coefficients of selected explosives and related compounds in the range of 0.1-2.8 THz. , 2007, Optics express.

[3]  Allen Taflove,et al.  Computational Electrodynamics the Finite-Difference Time-Domain Method , 1995 .

[4]  X-C Zhang,et al.  Identification and classification of chemicals using terahertz reflective spectroscopic focal-plane imaging system. , 2006, Optics express.

[5]  Shuting Fan,et al.  The potential of terahertz imaging for cancer diagnosis: A review of investigations to date. , 2012, Quantitative imaging in medicine and surgery.

[6]  G. Bastiaans,et al.  Detection and identification of explosive RDX by THz diffuse reflection spectroscopy. , 2006, Optics express.

[7]  J. Federici,et al.  THz imaging and sensing for security applications—explosives, weapons and drugs , 2005 .

[8]  S. V. Polishchuk,et al.  Nondestructive testing of polymer composites , 1991 .

[9]  J. Akimitsu,et al.  Terahertz BWO spectroscopy of conductors and superconductors , 2007 .

[10]  C. Reid,et al.  Spectroscopic methods for medical diagnosis at terahertz wavelengths , 2009 .

[11]  Mikko Leivo,et al.  Passive terahertz camera for standoff security screening. , 2010, Applied optics.

[12]  Kirill I. Zaytsev,et al.  Invariant embedding technique for medium permittivity profile reconstruction using terahertz time-domain spectroscopy , 2013 .

[13]  H.B. Wallace,et al.  Standoff Detection of Weapons and Contraband in the 100 GHz to 1 THz Region , 2007, IEEE Transactions on Antennas and Propagation.

[14]  P. Taday,et al.  Simulating the response of terahertz radiation to basal cell carcinoma using ex vivo spectroscopy measurements. , 2005, Journal of biomedical optics.

[15]  Eddie L. Jacobs,et al.  Enhanced terahertz imaging system performance analysis and design tool for concealed weapon identification , 2011, Security + Defence.

[16]  E. Pickwell‐MacPherson,et al.  Simulation of Terahertz Pulse Propagation in Biological Systems , 2004 .

[17]  Raj Mittra,et al.  FDTD Modeling of Metamaterials , 2008 .

[18]  Jason C. Dickinson,et al.  Terahertz imaging of subjects with concealed weapons , 2006, SPIE Defense + Commercial Sensing.

[19]  J. Blackshire,et al.  Nondestructive evaluation of aircraft composites using terahertz time domain spectroscopy , 2008, 2008 33rd International Conference on Infrared, Millimeter and Terahertz Waves.