Scattering of pulsed Terahertz wave by sand particles

Abstract

A pulsed Terahertz wave scattered by a spherical particle is numerical analyzed in this paper using a generalized Lorenz-Mie formula. The envelope information of Terahertz wave covers a spectrum range of 0.2THz-3.75THz is extracted from the original signal generated by a femtosecond laser source and then fitted by using the single peak function. The complex refractive index of particles changes with the frequency in the Terahertz band are obtained using the cubic spline interpolation algorithm based on the original data extracted from the HITRAN2012. Scattering efficiency, backscattering efficiency and polarization of sand particles are investigated. The effects of particle size and pulse width on the scattering characteristics are analyzed.