High sensitivity refractive index sensor in long-range surface plasmon resonance based on side polished optical fiber
Document Type
Article
Publication Date
1-1-2021
Abstract
A side-polished single mode optical fiber based on conventional long-range surface plasmon resonance (cLRSPR) sensor and symmetrical long-range surface plasmon resonance (sLRSPR) sensor was proposed and experimentally demonstrated. The proposed structure of cLRSPR is composed of optical fiber/dielectric buffer layer (DBL)/Ag film while for sLRSPR is consisted of optical fiber/DBL/Ag film/DBL. Magnesium fluoride, MgF2 with 50 nm thickness is used as DBL layer that lies beneath of Ag film in cLRSPR and covering both sides of Ag film in sLRSPR. 40 nm thickness of Ag layer is used with 5 mm length of sensing region. The result suggested that the sensing performance in terms of sensitivity of the cLRSPR sensor was better compared to sLRSPR and previous works of conventional surface plasmon resonance (cSPR) as it achieves as high as 2812.5 nm/RIU at 0.01 interval of refractive index with refractive index (RI) range of 1.33–1.34. The larger the sensitivity value indicates the better the performance of the SPR sensor. This design is expected to play an important role on chemical sensing and biological sensing as it displays higher penetration depth. © 2020 Elsevier Inc.
Keywords
Side-polished, Single-mode, Buffer layer, cSPR, cLRSPR, sLRSPR
Divisions
fac_eng,photonics
Funders
Impact-Oriented Interdisciplinary Research Grant (IIRG) under University Malaya PPGP(IIRG005B-19IISS)
Publication Title
Optical Fiber Technology
Volume
61
Publisher
Elsevier