Abstract
A highly sensitive temperature sensor based on surface plasmon resonance (SPR) of a side-polished single mode fiber is demonstrated. The sensor consists of a gold film coated side-polished fiber covered by a layer of UV-curable adhesive. Before introducing the UV-curable adhesive, the gold-coated fiber exhibits refractive index (RI) sensitivity of 1691.6 nm/RIU to 8800 nm/RIU in the range of 1.32 to 1.43. The resonant wavelength of the SPR sensor shifts to 650 nm when the adhesive is coated on the gold film, and is fixed at about 725 nm when the adhesive is cured. Due to the high thermo-optic and thermal expansion coefficient of the adhesive, the sensor structure achieves a temperature sensitivity of −0.978 nm/°C between 25 °C and 100 °C. The proposed optical fiber SPR sensor is simple, highly sensitive and cost effective, which may find potential applications for temperature measurements in the biomedical and environmental industries.
Highlights
Over the past few decades, great attention has been paid to the surface plasmon resonance (SPR)
SPR sensors have become popular owing to numerous advantages, such as low cost, small tested volume, convenient operation and in vivo test capability
We proposed sensitivities of 4.13 nm/
Summary
Over the past few decades, great attention has been paid to the surface plasmon resonance (SPR). Little work on temperature sensing with SPR-based optical fiber sensors. Single-mode twin-core fiber SPR temperature twin-core sensor by coating a layer of PDMSsensor on the by gold surface. The sensor can be operated in the reflection mode with higher temperature layer of PDMS on the gold surface of the fiber SPR device. Reflection mode with higher temperature sensitivities of 4.13 nm/°C to 2.07 nm/°C in the range of 20 a°Csimple optical temperature sensor.a A singleoptical mode fiber is side-polished coated a to 70 °C [21].fiber. The cost proposed optical sensormechanical is simple, highly sensitive, adhesive the side-polished fiber.strength. Such a device and effective, coating and hasonimproved mechanical due tohas thepotential adhesiveapplications coating on in thebiomedical side-polished environmental industries. Such a device has potential applications in biomedical and environmental industries
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