Plasmonic Nanowires for Wide Wavelength Range Molecular Sensing

Giovanni Marinaro, Gobind Das, Andrea Giugni, Marco Allione, Bruno Torre, Patrizio Candeloro, Jürgen Kosel, Enzo M. Di Fabrizio

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

In this paper, we propose the use of a standing nanowires array, constituted by plasmonic active gold wires grown on iron disks, and partially immersed in a supporting alumina matrix, for surface-enhanced Raman spectroscopy applications. The galvanic process was used to fabricate nanowires in pores of anodized alumina template, making this device cost-effective. This fabrication method allows for the selection of size, diameter, and spatial arrangement of nanowires. The proposed device, thanks to a detailed design analysis, demonstrates a broadband plasmonic enhancement effect useful for many standard excitation wavelengths in the visible and NIR. The trigonal pores arrangement gives an efficiency weakly dependent on polarization. The devices, tested with 633 and 830 nm laser lines, show a significant Raman enhancement factor, up to around 6 × 10⁴, with respect to the flat gold surface, used as a reference for the measurements of the investigated molecules.
Original languageEnglish (US)
Pages (from-to)827
JournalMaterials
Volume11
Issue number5
DOIs
StatePublished - May 17 2018

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