Abstract
A systematic investigation of the effects of symmetry breaking and the generation of Fano resonances in metal nanocavities is still lacking. In this work, we investigate the plasmonic properties of ring/disk silver nanocavities of various symmetry-breaking configurations. We find that multiple higher-order magnetic modes can be excited and that the quadrupole (Q) mode can even become dominant in a weakly asymmetric split ring. Magnetic-electric Fano resonances in weakly split-ring/disk nanocavities can be adjusted by tuning geometric parameters, such as the angle of the split, the width of the ring, the diameter of the ring, the center offset, and the number of superradiant antenna disks. The potential use of these multiple modes of ring/disk-based nanocavities in biosensing is evaluated by calculating the figure of merit and the contrast ratio. Our results correlate the various symmetry-breaking configurations with their plasmonic properties. The results will aid in the design of metal nanocavities for plasmonic applications.
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