Abstract
We observe and analyze multiple Fano resonances and the plasmon-induced transparency (PIT) arising from waveguidecoupled surface plasmon resonance in a metal-dielectric Kretschmann configuration. It is shown that the simulation results for designed structures agree well with those of the dispersion relation of waveguide theory. We demonstrate that the coupling between the surface plasmon polariton mode and multi-order planar waveguide modes leads to multiple Fano resonances and PIT. The obtained results show that the number of Fano resonances and the linewidth of resonances depend on two structural parameters, the Parylene C and SiO2 layers, respectively. For the sensing action of Fano resonance, the figure of merit for the sensitivity by intensity is estimated to be 44 times higher than that of conventional surface plasmon resonance sensors. Our research reveals the potential advantage of sensors with high sensitivity based on coupling between the SPP mode and multi-order PWG modes.
Highlights
The interaction of freely oscillating electrons on a metallic surface with photons can induce surface plasmon polaritons (SPPs)
From the analysis of electromagnetic calculations made for this structure, we illustrate that multiple Fano resonances and plasmon-induced transparency (PIT) are attributed to the coupling between the SPP mode and multi-order planar waveguides (PWGs) modes
We know that a structure consisting of only a semi-infinite dielectric layer adjacent to a metal layer can support SPP mode in a conventional surface plasmon resonance (SPR) sensor
Summary
The interaction of freely oscillating electrons on a metallic surface with photons can induce surface plasmon polaritons (SPPs) These are electromagnetic waves that propagate along the surface of a metal-insulator interface[1] and exponential evanescent field that is excited by transverse magnetic polarized light perpendicular to the interface. Hayashi et al recently achieved coupling between SPPs and PWG modes[10,11,12,13,14] They proposed a planar multilayer structure that exhibits plasmon-induced transparency (PIT) and Fano resonance in a Kretschmann configuration. We propose a planar structure of waveguide-coupled SPR sensor, it is a metal-dielectric Kretschmann structure that can achieve multiple Fano resonances and PIT. We estimate that the figure of merit of refractive index sensing for the sensitivity by intensity is 44 times higher than that of conventional SPR sensors[14]
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