Performance evaluation of a bilayer SPR-based fiber optic RI sensor with TiO2 using FDTD solutions
Al-Qazwini, Yusser and Muhammad Noor, Ahmad Shukri and Yadav, T. K. and Yaacob, Mohd. Hanif and Harun, Sulaiman Wadi and Mahdi, Mohd Adzir (2014) Performance evaluation of a bilayer SPR-based fiber optic RI sensor with TiO2 using FDTD solutions. Photonic Sensors, 4 (4). pp. 289-294. ISSN 1674-9251; ESSN: 2190-7439
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Official URL: http://link.springer.com/article/10.1007/s13320-01...
We proposed a new bilayer surface plasmon resonance-based fiber-optic refractive index sensor with silver and an over-layer of TiO2. We numerically investigated the optimal thickness of TiO2 over-layer in the proposed sensor and compared its performance to that based on typical bimetallic layers of silver-and-gold in the aqueous media using finite-difference time domain approach. We show that the use of TiO2 over-layer greatly improves the sensor performance in terms of sensitivity and signal-to-noise ratio compared to that with gold as the over-layer. Not only does the TiO2 over-layer offer a cost-effective alternative to gold for overcoming the oxidation problem, but also it allows resonance wavelength-tunability.
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