journal article·2025Open access

Controlling Raman enhancement in particle–aperture hybrid nanostructures by interlayer spacing

Kabusure M. Kabusure, Petteri Piskunen, Jarkko J. Saarinen, Veikko Linko, Tommi K. Hakala

Nanoscale· Volume 17· Issue 6

Abstract

Here we show how surface-enhanced Raman spectroscopy (SERS) features can be fine-tuned in optically active substrates made of layered materials. To demonstrate this, we used DNA-assisted lithography (DALI) to create substrates with silver bowtie nanoparticle-aperture pairs and then coated the samples with rhodamine 6G (R6G) molecules. By varying the spacing between the aperture and particle layer, we were able to control the strength of the interlayer coupling between the plasmon resonances of the apertures and those of the underlying bowtie particles. The changes in the resulting field enhancements were confirmed by recording the Raman spectra of R6G from the substrates, and the experimental findings were supported with finite difference time domain (FDTD) simulations including reflection/extinction and near-field profiles.
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Research context

OpenAlex topics: Advanced biosensing and bioanalysis techniques · Gold and Silver Nanoparticles Synthesis and Applications · Plasmonic and Surface Plasmon Research

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Center for Photonics Sciences, University of Eastern Finland, P.O. Box 111, FI-80101, Joensuu, Finland

Department of Chemistry, University of Eastern Finland, Yliopistokatu 7, P.O. Box 111, FI-80101, Joensuu, Finland

Biohybrid Materials, Department of Bioproducts and Biosystems, Aalto University, P.O. Box 16100, FI-00076, Aalto, Finland

Institute of Technology, University of Tartu, Nooruse 1, 50411, Tartu, Estonia

Funding

Research Council of Finland · Joint Programming Initiative on Antimicrobial Resistance · Sigrid Juséliuksen Säätiö · Suomen Kulttuurirahasto · H2020 European Institute of Innovation and Technology · Jane ja Aatos Erkon Säätiö · Magnus Ehrnroothin Säätiö · Emil Aaltosen Säätiö

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