Experimental and theoretical investigation of waveguided plasmonic surface lattice resonances

Håvard S. Ugulen, Ranveig Flatabø, Mansoor A. Sultan, Jeffrey T. Hastings, Martin M. Greve

Research output: Contribution to journalArticlepeer-review

Abstract

Plasmonic nanostructures are good candidates for refractive index sensing applications through the surface plasmon resonance due to their strong dependence on the surrounding dielectric media. However, typically low quality-factor limits their application in sensing devices. To improve the quality-factor, we have experimentally and theoretically investigated two-dimensional gold nanoparticle gratings situated on top of a waveguide. The coupling between the localized surface plasmon and waveguide modes results in Fano-type resonances, with high quality-factors, very similar to plasmonic surface lattice resonances. By combining plasmonic surface lattice resonance and waveguide theory, we present a theoretical framework describing the structures. By immersing the fabricated samples in three different media we find a sensitivity of ∼50 nm/RIU and figure of merit of 8.9, and demonstrate good agreement with the theory presented. Further analysis show that the sensitivity is very dependent on the waveguide parameters, grating constant and the dielectric environment, and by tuning these parameters we obtain a theoretical sensitivity of 887 nm/RIU.

Original languageEnglish
Pages (from-to)37846-37862
Number of pages17
JournalOptics Express
Volume30
Issue number21
DOIs
StatePublished - Oct 10 2022

Bibliographical note

Funding Information:
Universitetet i Bergen.

Publisher Copyright:
Journal © 2022.

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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