Abstract
In this paper, a sub-wavelength terahertz plasmonic waveguide based on a borophene–insulator–metal (BIM) structure is investigated by using the 2D finite-difference time-domain method. It is proved there is a plasmonic mode of high confinement and low propagation loss in an optimized wavelength range. A dynamically adjustable filter, formed by introducing a borophene nanoribbon into the BIM waveguide, is computationally and theoretically explored, which can achieve tailoring terahertz surface plasmon polaritons in deep-subwavelength scale. These results can further provide a broader path for dynamic regulation of light transmission in the borophene-based waveguide and the development of adjustable borophene-based optoelectronic filtering.
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