Multi-parameter Gold-Film Embedded PCF Sensors Based on Surface Plasmon Resonance

A novel multi-purpose sensor based on photonic crystal fiber and surface plasmon resonance is proposed, in which a gold film is deposited on the outer surface of the photonic crystal fiber to stimulate the surface plasmon resonance, and polydimethylsiloxane is deposited on the outer of the gold film for temperature sensing. Numerical results show that the proposed sensor can be used to achieve both independent detection of temperature and refractive index and simultaneous measurement of temperature and refractive index. When it is only used for temperature sensing, which can realize ultra-wide temperature detection in the range of - 1 similar to 110 degree celsius; and when the temperature is - 1 degree celsius, the maximum temperature sensitivity and resolution can be obtained as 40 nm/degree celsius and 2.5 x 10(-4) degree celsius, respectively. When it is only used for analyte refractive index sensing, the achievable refractive index detection range is 1.36 similar to 1.418, and when the analyte refractive index is 1.418, the maximal wavelength sensitivity is 66666.67 nm/RIU. When it is used for dual-parameter sensing of refractive index and temperature, the sensor can achieve cross-free temperature and analyte refractive index detection of - 1 similar to 10 degree celsius and 1.36 similar to 1.40 within the wavelength of 500 similar to 1350 nm; meanwhile, the average temperature and wavelength sensitivities that can be obtained as 20 nm/degree celsius and 5250 nm/RIU, respectively.