A high-performance surface plasmon resonance (SPR) fiber
sensor
is proposed with hyperbolic metamaterials (HMMs), nanodiamonds (NDs),
and polydimethylsiloxane (PDMS) to enhance the temperature sensitivity
and response time. The HMM with tunable dispersion can break through
the structural limitations of the optical fiber to improve the refractive
index (RI) sensitivity, while NDs and PDMS with large thermo-optic
coefficients enable to induce significant RI change under varied thermal
fields. The ternary composite endows the sensor with a high temperature
sensitivity of −9.021 nm/°C, which is 28.6 times higher
than that of the conventional gold film-based SPR sensor. Furthermore,
NDs with high thermal conductivity (2200 W/mK) effectively expedite
the thermal response of PDMS, which reduces the response time from
80 to 6 s. It is believed that the proposed sensors with high sensitivity,
fast response time, and compact size have great potential for applications
in industrial production, healthcare, environmental monitoring, etc.
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