Photonic Sensors, Volume. 4, Issue 4, 289(2014)
Performance Evaluation of a Bilayer SPR-Based Fiber Optic RI Sensor With TiO2 Using FDTD Solutions
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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Yusser AL-QAZWINI, A. S. M. NOOR, T. K. YADAV, M. H. YAACOB, S. W. HARUN, and M. A. MAHDI. Performance Evaluation of a Bilayer SPR-Based Fiber Optic RI Sensor With TiO2 Using FDTD Solutions[J]. Photonic Sensors, 2014, 4(4): 289
Received: Jun. 24, 2014
Accepted: Sep. 6, 2014
Published Online: Dec. 8, 2014
The Author Email: M. NOOR A. S. (ashukri@upm.edu.my)