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Updated: Dec 25, 2025

Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
Published on: December 27, 2012
Spurious Absorption Frequency Appearance Due to Frequency Conversion Processes in Pulsed THz TDS Problems
Vyacheslav A Trofimov1,2, Nan-Nan Wang1, Jing-Hui Qiu1
1Department of Microwave Engineering, Harbin Institute of Technology, Harbin 150001, China.
Abstract:
The appearance of the spurious absorption frequencies caused by the frequency conversion process at the broadband THz pulse propagation in a medium is theoretically and experimentally discussed. The spurious absorption frequencies appear due to both the frequency doubling and generation of waves with sum or difference frequency. Such generation might occur because of the nonlinear response of a medium or its non-instantaneous response. This phenomenon is confirmed by the results of a few physical experiments provided with the THz CW signals and broadband THz pulses that are transmitted through the ordinary or dangerous substances. A high correlation between the time-dependent spectral intensities for the basic frequency and generated frequencies is demonstrated while using the computer simulation results. This feature of the frequency conversion might be used for the detection and identification of a substance.
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