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A novel microchannel-in-a-fiber plasmonic sensor

Arcadio, F. ; Oliveira, R. ; Prete, D. ; Minardo, A. ; Zeni, L. ; Bilro, L. ; Cennamo, N. ; Nogueira, R.N.

IEEE Sensors Journal Vol. 23, Nº 11, pp. 11648 - 11655, April, 2023.

ISSN (print): 1530-437X
ISSN (online):

Scimago Journal Ranking: 0,99 (in 2022)

Digital Object Identifier: 10.1109/JSEN.2023.3268002

In this work, a novel Surface Plasmon Resonance (SPR) sensor has been designed, realized and investigated. The SPR platform was created by using a D-shaped plastic optical fiber shell (POFS), obtained by removing the graded index core region from the fiber’s protective jacket, in order to create a microchannel. The latter was then coated with a gold nanofilm in order to obtain the plasmonic sensitive region. The sensor’s structure includes an integrated measuring cell, being the solution under test injected into the microchannel using a peristaltic pump. The microchannel dimension (160 μm) allows to avoid microfluidic systems, typically adopted in this kind of SPR configurations. As a proof of concept, the plasmonic sensor has been tested as a refractometer using different water-ethanol solutions, with a refractive index range from 1.332 to 1.352. The experimental results have highlighted a sensitivity and a resolution equal to about 1026 nm/RIU and 1.95 × 10 -4 RIU, respectively. These values testify to the proposed sensor goodness and its suitability for biochemical sensing applications.