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Structure parameters and optical properties of the proposed TINR. (a) Schematic diagram of TINR. (b) Extinction, scattering, and absorption spectra of TINR (Rin = 125 nm, Rout = 175 nm, and L = 150 nm).
Two-layer plasmon hybridization model for TINR. (a) The extinction spectrum of APP, resulting from the hybridized process between TID and ACH. (b) The second layer of plasmon hybridization model: the hybridized process between APP and TCH.
Dependence of Fano resonance on the central distance (L) of TINR.
Refractive index sensing results for TINR. (a) The spectral shifts of peaks and Fano dip of TINR vs refractive indices of the covered medium. (b) The spectral shifts of SNR (the outer and inner radii are 175 and 125 nm, respectively) vs refractive index.
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