Abstract
Terahertz (THz) transmission simulations play an important role in THz technology researches, especially for the structural design of a THz waveguide. Ray model takes into account both structure parameter of waveguide and the divergence angle of beam light and could be an alternative way for THz transmission behavior simulations. In this paper, the ray model is used to calculate the transmission loss of tube waveguide, and the simulated transmission losses are presented to compare with the results calculated by COMSOL. The suitable THz frequency range of ray model is discussed by analyzing the transmission loss spectra of tube waveguides with various core sizes. The credibility of ray model on terahertz transmission simulations is demonstrated based on the experimental results tested by THz-TDS and calculated results.
Highlights
In recent years, terahertz (THz) waveguides and fibers have been extensively investigated
The ray model [7], which is based on geometric optics method, can be used to calculate the transmission loss for tube waveguides and metal/dielectric hollow glass waveguides when the inner diameter of waveguide is much larger than the transmission wavelength
Whether ray model is applicable or not in lower frequency? In this paper, we demonstrated ray model can be used to calculate transmission loss for tube waveguides, even at the frequency as low as 0.5 THz
Summary
Terahertz (THz) waveguides and fibers have been extensively investigated. Many types of THz waveguides are designed to transmit THz radiations with dry air medium, including photonic crystal fibers [1], metal/dielectric hollow glass waveguides [2] [3], and polymer tube waveguides [4] [5] [6]. The ray model [7], which is based on geometric optics method, can be used to calculate the transmission loss for tube waveguides and metal/dielectric hollow glass waveguides when the inner diameter of waveguide is much larger than the transmission wavelength. The ray model has been used to calculate transmission loss in metal/dielectric hollow glass waveguide for delivery of mid- and far-infrared (2.5 THz) radiations [2]. Whether ray model is applicable or not in lower frequency (larger wavelength)? In this paper, we demonstrated ray model can be used to calculate transmission loss for tube waveguides, even at the frequency as low as 0.5 THz
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