Hosoki Ai, Nishiyama Michiko, Watanabe Kazuhiro, Sakurai Nozomu
Opt Express. 2022 Sep 26;30(20):35348-35360. doi: 10.1364/OE.469165.
This study experimentally demonstrated the effects of two polarization-maintaining fibers (PMFs) as a sensing region instead of conventional single-mode fiber (SMF) using Au-coated hetero-core optical fiber surface plasmon resonance (SPR) sensor. We experimentally observed that the SPR resonant wavelength is shifted toward longer wavelength with refractive index (RI) increasing from 1.332 to 1.396. A PMF sensor exhibits the broad SPR spectra, resulting in a higher sensitivity with a 1.5-fold change in the light intensity at 850 nm relative to RI, compared with the SMF case. Discussions most likely responsible for this effect are given by the lower angular distribution peak in the hetero-core region of PMFs.
本研究通过实验证明了使用镀Au异芯光纤表面等离子体共振（SPR）传感器时，两种保偏光纤（PMF）作为传感区域而非传统单模光纤（SMF）的效果。我们通过实验观察到，随着折射率（RI）从1.332增加到1.396，SPR共振波长向更长波长移动。与单模光纤情况相比，保偏光纤传感器呈现出较宽的SPR光谱，导致在850 nm处光强度相对于折射率有1.5倍变化时具有更高的灵敏度。保偏光纤异芯区域较低的角分布峰值给出了对此效应最可能的解释。
