The Modeling Peculiarities of Diffractive Propagation of the Broadband Terahertz Two-dimensional Field☆

Abstract In this paper, we discuss the features of numerical simulation of propagation of the two-dimensional pulsed broadband terahertz (THz) fields. A set of separate spectral components used to describe diffraction of broadband THz pulses. To eliminate sampling theorem restriction in the numerical simulation of diffraction process for the complete spectral range, we use the representation of two-dimension fields as angular spectrum for the high-frequency spectral components and the convolution of initial fields with the impulse response for the low-frequency components. The peculiarities of diffraction of pulsed broadband terahertz radiation are manifested in the form of the dips in its spectrum, which is obtained at different points of the screen. The application of the given model for THz pulsed time-domain holography is demonstrated by the reconstruction of the image of the letter “K”.