A hollow fiber temperature sensor filled with graphene-Ag composite nanowire and liquid\nis presented and numerically characterized. The coupling properties and sensing performances\nare analyzed by finite element method (FEM) using both wavelength and amplitude interrogations.\nDue to the asymmetrical surface plasmon resonance sensing (SPR) region, the designed sensor exhibits\nstrong birefringence, supporting two separate resonance peaks in orthogonal polarizations. Results\nshow that x-polarized resonance peak can provide much better signal to noise ratio (SNR), wavelength\nand amplitude sensitivities than y-polarized, which is more suitable for tempertature detecting.\nThe graphene-Ag composite nanowire filled into the hollow fiber core can not only solve the oxidation\nproblem but also avoid the metal coating. A wide temperature range from 22 ââ??¦C to 47 ââ??¦C with steps\nof 5 ââ??¦C is calculated and the temperature sensitivities we obtained are 9.44 nm/ââ??¦C for x-polarized\nand 5.33 nm/ââ??¦C for y-polarized, much higher than other sensors of the same type.
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