a Transmission properties of spectra of complete nanoring alone. The distribution of z-component of electric field at the wavelength of 1027 nm denoted by the inset A.
b Mechanism of the plasmonic hybridization between the dipolar modes of the disk (D
) and anti-dot (hole) (D
) structures and the energy diagram of the degenerated plasmon bonding (D
) and antibonding (D
) modes. The signs “+” and “−” represent the positive and negative charges, respectively. c Transmission spectra of the single half nanoring. The distribution of z-component of electric field at the wavelength of 1297 nm denoted by the inset B