Work

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

Year: 2024

Type: article

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.

Source: Nanoscale

DOI: 10.1039/d4nr03648d

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

Institutions: University of Eastern Finland, Aalto University, University of Tartu

Language: English

Topic: Gold and Silver Nanoparticles Synthesis and Applications

Subfield: Electronic, Optical and Magnetic Materials

Field: Materials Science

Domain: Physical Sciences

Open Access status: hybrid