16 April 2018 Simulation of the ТHz radiation in the tapered waveguide
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Proceedings Volume 10614, International Conference on Atomic and Molecular Pulsed Lasers XIII; 1061418 (2018) https://doi.org/10.1117/12.2302989
Event: XIII International Conference on Atomic and Molecular Pulsed Lasers, 2017, Tomsk, Russia
Abstract
The finite-element method was employed to model and simulate the terahertz (THz) wave propagation in a tapered waveguide. The relatively infrequent use of dielectric waveguides and antennas is due to the lack of analysis tools. Maxwell's equations have an analytical solution only for a rectangular shape crystal. Lack of analysis tools inhibits antenna development because physicist must resort to cut-and-try methods. It is only recently that simulation of electromagnetic fields in arbitrarily shaped media has become fast and practical.Numerical simulation results showed changes in the mode structure of the THz radiation along the length of the crystal, the concentration of the THz field inside the crystal and the radiation structure from the crystal-air interface. Excitation of ТHz radiation in the tapered waveguide with the help of an optical laser pulse permits the resolution of problems connected with input/output coupling - mode matching and single mode propagation. THz energy concentration by dielectric wedge antenna improves the spatial resolution and increases the signal/noise ratio (SNR) for the THz imaging and spectroscopy.
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A. S. Nikoghosyan, Sh. Kh. Arakelyan, M. A. Kazaryan, "Simulation of the ТHz radiation in the tapered waveguide", Proc. SPIE 10614, International Conference on Atomic and Molecular Pulsed Lasers XIII, 1061418 (16 April 2018); doi: 10.1117/12.2302989; https://doi.org/10.1117/12.2302989
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