Actuated plasmonic nanohole arrays for sensing and optical spectroscopy applications

Daria Kotlarek, Stefan Fossati, Priyamvada Venugopalan, Nestor Gisbert Quilis, Jiri Slabý, Jiří Homola, Médéric Lequeux, Frédéric Amiard, Marc Lamy De La Chapelle, Ulrich Jonas, Jakub Dostalek

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Herein, we report a new approach to rapidly actuate the plasmonic characteristics of thin gold films perforated with nanohole arrays that are coupled with arrays of gold nanoparticles. The near-field interaction between the localized and propagating surface plasmon modes supported by the structure was actively modulated by changing the distance between the nanoholes and nanoparticles and varying the refractive index symmetry of the structure. This approach was applied by using a thin responsive hydrogel cushion, which swelled and collapsed by a temperature stimulus. The detailed experimental study of the changes and interplay of localized and propagating surface plasmons was complemented by numerical simulations. We demonstrate that the interrogation and excitation of the optical resonance to these modes allow the label-free SPR observation of the binding of biomolecules, and is applicable for in situ SERS studies of low molecular weight molecules attached in the gap between the nanoholes and nanoparticles.
    Original languageEnglish
    Pages (from-to)9756-9768
    Number of pages13
    JournalNanoscale
    Volume12
    DOIs
    Publication statusPublished - 2020

    Research Field

    • Biosensor Technologies

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