Effects of metal film on transmission characteristics of single-dielectric-slab THz waveguide
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The effects of a symmetrical metal film on the transmission characteristics of TM mode in the thicker single-dielectric-slab THz waveguide is analyzed theoretically. We find that the coating of metal film results in huge difference in the attenuation coefficients of TM mode, and it is increasing with respect to increase in the THz frequency. In case of a thicker single-dielectric-slab THz waveguide with low absorption loss, the influence of metal film on the loss of TM mode can not be ignored. We further study the influence of metal film on the mode field distribution of TM mode and we find that the mode field distribution of TM mode in the thicker dielectric slab is varied significantly after coating.