Journal
IEEE PHOTONICS TECHNOLOGY LETTERS
Volume 31, Issue 14, Pages 1159-1162Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LPT.2019.2908288
Keywords
Optic fiber sensor; surface plasmon resonance; refractive index; double layers of film
Funding
- Natural Science Foundation of Jiangsu Province, China [BK20181391]
- Natural Science Foundation of the Higher Education Institutions of Jiangsu Province, China [17KJB140018]
- Research Center of Optical Communications Engineering and Technology, Jiangsu Province, China [ZXF20170301]
- Nanjing University of Posts and Telecommunications (NUPTSF) [NY215142]
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A surface plasmon resonance (SPR)-based fiber-optic biosensor with bi-layers (copper, ITO) has been experimentally proposed and demonstrated. Benefitting from its high refractive index and unique optoelectronic properties, the additional ITO layer immobilized onto the Cu film can significantly improve its sensing performance. A sensitivity of 4583.4 nm/RIU (refractive index unit) was achieved, with a large enhancement in the figure of merit (FOM) by 61.6% compared with the sample without the ITO layer. Furthermore, the proposed SPR-based biosensor exhibits a bovine serum albumin (BSA) solution concentration sensitivity of 1.907 nm/(mg/mL) and a detection limit of 5.70x10(-7) mg/mL. Significantly, this biosensor shows a sub-microliter-dose sensitivity, with promising biochemical applications such as DNA hybridization, cancer screenings, medicine examination, and environmental engineering.
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