Plasmonic characteristics of rhodium dual brokennanorings in UV-visible regime

Abstract This work reports on the plasmonic properties of a symmetry-breaking system consisting of rhodium dual broken nanorings, in the ultraviolet-visibleregime. In the structure, two rhodium broken rings are located with a separation on the scale of nanometers. As the separation, the light polarization,and the relative orientation of the broken angles are respectively varied, theplasmonic scattering efficiency of the system is investigated, using the finite difference time domain method. Multiple plasmonic resonances are revealed,and the associated asymmetry-induced Fano-like lineshapes are fitted to amodel that employs multiple Fano lineshape functions. The resonance wave-lengths, the spectral widths, and the characteristic q values are determinedfrom the best fit parameters, and the plasmonic characteristics of the sys-tem are quantitatively probed. The results in this work may be beneficial indesigns of plasmonic devices that operates at ultraviolet-visible wavelengths.