Multiple Plasmonic Fano Resonances Revisited with Modified Transformation-Optics Theory

Plasmonic Fano resonances have recently attracted a great deal of research interest due to their sharp asymmetric profile, high sensitivity the ambient material and low radiation damping. In this paper, we extend plasmonic that resulted from interference between bright dark modes in coreshell nanoparticle system for novel biosensing, optical switching applications, by using theory transformation optics. To end, consider properties dielectric-core-metallic-shell dimer derive full analytical formulae different geometric configurations. Our results demonstrated breaking geometrical symmetry structure, multiple arise owing near-field coupling resonant modes. Electromagnetic induced transparency (EIT)-like effects are observed when resonance frequencies overlap. Strong dependence localized surface plasmon (LSP) on geometry renders highly tunable proposed structure through independently altering spectral profile each nanoparticle, which provides much feasibility since most reported literature collective behavior cannot be tuned independently. Furthermore, figure merit refractive index sensing higher-order predicted up 36% greater than single nanowire. These make nanostructure attractive many potential applications such as multiwavelength modulation.