Abstract
We theoretically investigate a band-stop filter based on a metal-insulator-metal waveguide with a single-sided multiple-teeth-shaped structure. Three-teeth-shaped structure is used to realize the U-shaped transmission spectrum. The central wavelength of the filter can be adjusted by the depth of the teeth, and the bandwidth can be slightly modified by the spacing between the teeth-shaped cavities. Moreover, by changing the spacing of the teeth-shaped cavities, we found the suitable data to achieve the best U-shape transmission spectrum. The criterion for judging the U-shaped transmission spectrum is the comparison of the slopes of U-shape’s both sides. The unilateral-multiple-teeth-shaped filter based on double Fano line-shapes has small band-stop width less than 200 nm and can be used to design narrow band-stop filter.
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