Double-dielectric-slab waveguides for guiding broadband THz wave with low propagation loss and small beam width
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A double-dielectric-slab waveguide is proposed to guide broadband THz waves. We derive the dispersion equations of both the even mode and odd mode of the waveguide, which are used to study the relationships between the mode propagating characteristics and the waveguide structure, as well as the THz wave frequency. Furthermore, the mode field distribution characteristics of the two modes are studied. The results obtained show that this simple waveguide can guide the broadband THz wave with relatively low loss and small beam width simultaneously.