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, to create a microchannel. The latter was then coated with a gold nanofilm 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 mu m) allows for avoiding microfluidic systems, typically adopted in this kind of SPR configuration. As a proof of concept, the plasmonic sensor has been tested as a refractometer using different water-ethanol solutions, with a refractive index (RI) ranging 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 x 10(-4) RIU, respectively. These values testify to the proposed sensor's goodness and its suitability for biochemical sensing applications.
A Novel Microchannel-in-a-Fiber Plasmonic Sensor
Arcadio, F;Minardo, A;Zeni, L;Cennamo, N;
2023
Abstract
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, to create a microchannel. The latter was then coated with a gold nanofilm 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 mu m) allows for avoiding microfluidic systems, typically adopted in this kind of SPR configuration. As a proof of concept, the plasmonic sensor has been tested as a refractometer using different water-ethanol solutions, with a refractive index (RI) ranging 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 x 10(-4) RIU, respectively. These values testify to the proposed sensor's goodness and its suitability for biochemical sensing applications.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
