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(A,B) Spectra calculated for the Au ring-disk nanostructures with different R3. The R1 and R2 of the ring was unchanged (R1 = 20 nm; R2 = 30 nm). The H of the ring-disk nanostructures was unchanged (H1 = H2 = H = 10 nm). The R3 of the disk increased from 10 to 60 nm.
