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(A,B) Spectra calculated for the Au ring-disk nanostructures with different R2. The R1 of the ring was unchanged (R1 = 20 nm). The R3 of the disk was unchanged (R3 = 30 nm). The H of the ring-disk nanostructures was unchanged (H1 = H2 = H = 10 nm). The R2 of the ring increased from 22 to 50 nm.
