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Generation of multiple Fano resonances are theoretically investigated in asymmetry ring-disk and asymmetry split-ring-disk. The effects of structural parameter on multiple Fano resonances are analyzed in detail, and it is found that the wavelength of multipole Fano resonances can be extensively and accurately controlled by changing the gap size and the relative offset between the ring/split-ring and...
A subwavelength metal grating with single layer and double layer structure are proposed and analyzed. The two gratings are evaluated and compared in terms of the reflectance spectra and the coupling efficiency. Numerically simulation shows that the absorption peak wavelength shows some red-shift when duty cycle of the grating increases for the single layer grating. The height modulated reflectance...
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