META 2021, META'12

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Surface plasmon effects excitation from three-pair arrays of silver nanorings for subwavelength imaging
Yuan-Fong Chau, Huang-Yi Li

Last modified: 2012-01-03

Abstract


We studied, numerically, the characteristics of the surface plasmon of a system consisting of several pair arrays of silver nanorings. Effects from different numbers of pair arrays, illumination wavelengths, and the core refractive index of silver-nanocylinders are studied by using the finite element method. Results show that the peak wavelengths shift to NIR wavelengths when the solid silver nanodisks are instead of silver nanorings. The near-field intensities in the gaps of our proposed structures can be tuned much stronger with a redshift by varying the wavelength of the incident light. The main features of surface plasmon effects can be qualitatively understood from some simple models of three, six, eight, and twelve pairs of silver-shell nanorings.

Keywords


surface plasmon; nanorings; silver nanodisks