Tantalum Pentoxide Sensitization Empowers U-Shaped Dual-Channel SPR Fiber Sensor

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To address the increasing demand for versatile applications, there is a pressing need for high-resolution sensing devices that can operate in intricate environmental conditions. This work demonstrates a highly sensitive U-shaped surface plasmon resonance (SPR) sensor with two independent sensing channels, based on tantalum pentoxide (Ta2O5) film sensitization technology. We systematically optimized the sensor’s key structural parameters using the transmission matrix method. The experimental findings demonstrate that the refractive index (RI) sensitivity of Channel B reaches up to 4161 nm/RIU, which is twice that of Channel A (2005 nm/RIU). Temperature variations have a significant impact on Channel B (-0.25 nm/°C) due to the Ag/Ta2O5film coating, while Channel A (just silver film) stays practically unaffected within the measurement range of 15 to 35°C. Furthermore, the U-shaped sensor features high sensitivity, compact structure, and good stability, which establishes a novel platform for dual-channel measurement applications.

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