Plasmonic Nanowires for Wide Wavelength Range Molecular Sensing

Materials
Giovanni MarinaroEnzo Di Fabrizio

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.

References

May 24, 2008·Nature Materials·Jeffrey N AnkerRichard P Van Duyne
Nov 4, 2008·Biosensors & Bioelectronics·Gobind DasEnzo Di Fabrizio
Mar 5, 2010·Langmuir : the ACS Journal of Surfaces and Colloids·Hicham HamoudiVladimir A Esaulov
Jan 1, 2009·Nanoscale Research Letters·Marco SalernoRoberto Cingolani
May 9, 2013·Scientific Reports·Gobind DasEnzo Di Fabrizio
Jan 24, 2014·Advanced Materials·Manohar ChirumamillaEnzo Di Fabrizio
Oct 28, 2014·Nanoscale·Amaury de Melo SouzaStefano Sanvito
Mar 21, 2015·Physical Chemistry Chemical Physics : PCCP·Rudolf Holze
Sep 25, 2015·ACS Applied Materials & Interfaces·Gobind DasEnzo Di Fabrizio
Mar 10, 2016·ACS Applied Materials & Interfaces·Remo Proietti ZaccariaMaurizio Canepa
Apr 30, 2016·Optics Letters·Yashna Sharma, Anuj Dhawan
Aug 25, 2016·Journal of the American Chemical Society·Lakshminarayana PolavarapuLuis M Liz-Marzán

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Citations

Apr 20, 2019·Biosensors·Roberto PilotLaura Fabris

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Methods Mentioned

BETA
surface plasmon resonance

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