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...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Published: |
SpringerOpen
2014
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| Online Access: | http://psasir.upm.edu.my/id/eprint/34875/ http://link.springer.com/article/10.1007/s13320-014-0207-y |
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| Summary: | 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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