Performances of different metals in optical ﬁbre-based surface plasmon resonance sensor
The capability of various metals used in optical ﬁbre-based surface plasmon resonance (SPR) sensing is studied theoretically. Four metals, gold (Au), silver (Ag), copper (Cu) and aluminium (Al) are considered for the present study. The performance of the optical ﬁbre-based SPR sensor with four different metals is obtained numerically and compared in detail. The performance of optical ﬁbre-based SPR sensor has been analysed in terms of sensitivity, signal-to-noise (SNR) ratio and quality parameter. It is found that the performance of optical ﬁbre-based SPR sensor with Au metal is better than that of the other three metals. The sensitivity of the optical ﬁbre-based SPR sensor with 50 nm thick and 10 mm long Au metal ﬁlm of exposed sensing region is 2.373 𝜇m/RIU with good linearity, SNR is 0.724 and quality parameter is 48.281 RIU-1. The thickness of the metal ﬁlm and the length of the exposed sensing region of the optical ﬁbre-based SPR sensor for each metal are also optimized.
Volume 94, 2020
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