Design, fabrication and characterisation of silica-titania thin film coated over coupled long period fibre gratings: Towards bio-sensing applications

被引：38

作者：

Biswas, Palas ^{[1
]}

Chiavaioli, Francesco ^{[2
]}

Jana, Sunirmal ^{[1
]}

Basumallick, Nandini ^{[1
]}

Trono, Cosimo ^{[2
]}

Giannetti, Ambra ^{[2
]}

Tombelli, Sara ^{[2
]}

Mallick, Aparajita ^{[1
]}

Baldini, Francesco ^{[2
]}

Bandyopadhyay, Somnath ^{[1
]}

机构：

[1] CSIR CGCRI, Cent Glass & Ceram Res Inst, 196 Raja SC Mullick Rd, Kolkata 700032, India

[2] CNR IFAC, Inst Appl Phys Nello Carrara, Via Madonna del Piano 10, I-50019 Sesto Fiorentino, Italy

来源：

SENSORS AND ACTUATORS B-CHEMICAL | 2017年 / 253卷

关键词：

Long period fibre grating; over coupling; Thin film overlay; Sol-gel-based silica-titania thin film; Biosensinga; REFRACTIVE-INDEX SENSITIVITY; SENSOR; OPTIMIZATION; DEPOSITION; MODE; POINT;

D O I：

10.1016/j.snb.2017.06.139

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

In this paper we report on the application of over coupled long period fibre gratings (OCLPFGs) for detecting small changes in the surrounding refractive index (SRI). In addition, the optimization of a high RI(HRI) overlay deposited over the fibre for the adhesion of biological species is described. In this study, we utilised a sol-gel-based silica-titania thin film as HRI material deposited on the grating portion using the simple and versatile dip-coating (DC) technique. The OCLPFG-based sensor has been manufactured in such a way that the resonant band retains good visibility (close to the maximum coupling condition) in the transmission spectrum even after high thermal sintering of the coating material. Three different batches of OCLPFGs were produced using different withdrawal speeds and sol viscosities. By carefully tuning both the overlay thickness during the DC process and the RI of the sol-gel material during its preparation, it was possible to bring the sensor into the so-called transition mode working region, and thus maximize the sensing performance in terms of SRI changes. All devices were characterized as optical refractometers in the RI range of interest for a bio-sensing application (from 1.33 to 1.34) and, after a suitable bio-functionalisation process, one of them was used to implement a classical receptor-analyte biosensor. (C) 2017 Elsevier B.V. All rights reserved.

引用

页码：418 / 427

页数：10