Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7134118 | Sensors and Actuators A: Physical | 2017 | 8 Pages |
Abstract
We propose and demonstrate a cascaded distributed multichannel fiber surface plasmon resonance (SPR) refractive index (RI) sensor by using a gold film coating thickness adjustment approach. For a multimode fiber-based SPR sensor, different gold film thicknesses produce different resonance wavelengths, different dynamic ranges, and even different testing sensitivities. Therefore, we design and fabricate a cascaded distributed two-channel multimode fiber SPR sensor with the gold film thickness of 30Â nm in #1 sub-channel and 60Â nm in #2 sub-channel. The corresponding testing sensitivities are 1712Â nm/RIU and 3038Â nm/RIU with the RI range of 1.333-1.385. The experimental results indicate that, in the range of 20nm-60Â nm, the smaller is the gold film thickness, the larger is the RI testing range, and the lower is the testing sensitivity, and the deeper is the resonance dip. In addition, it is worthy to say that, the testing sensitivity and the dynamic range of the cascaded distributed multichannel fiber SPR sensor keep unchanged after multiple sensing sub-channels being cascaded-connected. By using the gold film thickness adjustment approach, we overcome the limit of adjusting and separating the dynamic ranges of the multichannel fiber SPR sensors effectively.
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Authors
Yu Zhang, Peibo Liang, Yushan Wang, Yaxun Zhang, Zhihai Liu, Yong Wei, Zongda Zhu, Enming Zhao, Jun Yang, Libo Yuan,