Ambiguous Refractive Index Sensitivity of Fano Resonance on an Array of Gold Nanoparticles
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We investigate the optical response to refractive index changes of a Fano resonance occurring in a random array of gold nanoparticles supported on a glass substrate. The Fano resonance results from the interference between localized surface plasmon on a gold nanoparticle and the light reflected at the boundary of the glass substrate. We demonstrate that the sensitivity of the resonance to the refractive index of the surrounding medium is highly dependent on the excitation geometry and can assume either positive or negative values. We furthermore present a theoretical analysis explaining this behavior based on the rigorous coupled wave analysis (RCWA) as well as the island film theory.
KeywordsNanoparticle array Fano resonance Surface plasmon Sensor Rigorous coupled wave analysis Island film theory
This research was supported by Praemium Academiae of the Academy of Sciences of the Czech Republic, the Czech Science Foundation (contract P205/12/G118), and by the Ministry of Education, Youth and Sports (contract LH11102).
- 13.Čtyroký J, Kwiecien P, Richter I (2013) Analysis of hybrid dielectric-plasmonic slot waveguide structures with 3D Fourier modal methods. J Eur Opt Soc-Rapid 8. Artn 13024 doi: 10.2971/Jeos.2013.13024
- 22.Bohren CFH, D. R (1983) Absorption and scattering of light by small particles. John Wiley and SonsGoogle Scholar