Metal enhanced fluorescence using nanostructures on silver formed with Ti:Saphire femtosecond pulsed laser

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Mattos, Vicente S. ; Paolillo, Fernanda R. ; Cavalinni, Daniel ; Pereira-da-Silva, Marcelo A. ; de Souza, Marco A. A. ; Yasuoka, Fatima M. M. ; Guimaraes, Francisco E. G. ; de Castro Neto, Jarbas C. ; Klotzbach, U ; Watanabe, A ; Kling, R

• Document type: Journal article
• Source: LASER-BASED MICRO- AND NANOPROCESSING XIV; v. 11268, p. 7-pg., 2020-01-01.

Abstract

Metal enhanced fluorescence is a phenomenon that occurs when a fluorophore is positioned near a conductive structure. Structures can be formed by the interaction of high-energy laser with a sample, on which the femtosecond laser pulses interact with the surface without heat effects. This work aims to study nanostructure formation in polished bulk silver, in order to amplify signals of fluorescence. A Titanium-sapphire femtosecond laser was used to mark silver surfaces. SEM images shows nanostructures formed in chaotic agglomerate of nanospheres with size of 50-800nm. Using Protoporphyrin-IX, the fluorescence amplification was around 300 times compared to a surface without the nanostructures. (AU)

• FAPESP's process: 13/07276-1 - CEPOF - Optics and Photonic Research Center
• Grantee: Vanderlei Salvador Bagnato
• Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC