epsilon-Near-Zero Materials for Highly Miniaturizable Magnetoplasmonic Sensing Devices

Author(s)

Moncada-Villa, E. ^[1] ; Oliveira, Jr., Osvaldo N. ^[2] ; Mejia-Salazar, J. R. ^[3]

Affiliation

^[1] Univ Pedag & Tecnol Colombia, Escuela Fis, Ave Cent Norte 39-115, Tunja 150003 - Colombia

^[2] Univ Sao Paulo, Sao Carlos Inst Phys, CP 369, BR-13560970 Sao Carlos, SP - Brazil

^[3] Natl Inst Telecommun Inatel, BR-37540000 Santa Rita Do Sapucai, MG - Brazil

• Document type: Journal article
• Source: Journal of Physical Chemistry C; v. 123, n. 6, p. 3790-3794, FEB 14 2019.
• Web of Science Citations: 3

Abstract

We show here the design of a magneto-plasmonic sensing platform consisting of a bilayer of a transparent conducting oxide and a gold film grown on a ferromagnetic substrate. Near the bulk plasmon frequency (epsilon approximate to 0) of the oxide film, sharp resonances are observed for the transverse magneto-optical Kerr effect, which are used for sensing permittivity changes. As a proof of concept, we demonstrate that the proposed architecture is able to detect glucose at millimolar concentration levels in aqueous media, even without any surface functionalization. Because no prism coupler is needed, the sensing platform may be miniaturized and employed in microfluidic systems for point-of-care devices. (AU)

• FAPESP's process: 13/14262-7 - Nanostructured films from biologically-relevant materials
• Grantee: Osvaldo Novais de Oliveira Junior
• Support Opportunities: Research Projects - Thematic Grants