Li Qiu-Shun, Zhang Xu-Lin, Shi Jian-Guo, Xiang Dong, Zheng Lan, Yang Yan, Yang Jun-Hui, Feng Dong, Dong Wen-Fei
Key Biosensor Laboratory of Shandong Province, Biology Institute of Shandong Academy of Sciences, Jinan 250014, China.
State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, China.
Sensors (Basel). 2016 Dec 21;16(12):2205. doi: 10.3390/s16122205.
The response of a novel long-period fiber grating (LPFG) with a period of 180 µm to a surrounding refractive index (RI) was investigated. The results displayed that, with the increase in RI of the surrounding media of cladding glass in the grating region, the resonant peak located at 1336.4 nm in the transmission spectrum gradually shifts towards a shorter wavelength, while the resonant peak located at 1618 nm gradually shifted towards a longer wavelength. Moreover, the resonant peak at 1618 nm is much more sensitive to the surrounding RI than that of the one at 1336.4 nm. Compared with the conventional LPFG and other types of wavelength-interrogated RI sensors, such as ring resonators, surface plasmon resonance sensors, and Fabry-Perot interferometric sensors, this novel LPFG possesses a higher sensitivity, which achieved 10,792.45 nm/RIU (RI unit) over a RI range of 1.4436-1.4489.
研究了周期为180 µm的新型长周期光纤光栅（LPFG）对周围折射率（RI）的响应。结果表明，随着光栅区域包层玻璃周围介质RI的增加，透射光谱中位于1336.4 nm处的共振峰逐渐向较短波长移动，而位于1618 nm处的共振峰逐渐向较长波长移动。此外，1618 nm处的共振峰对周围RI的敏感度远高于1336.4 nm处的共振峰。与传统LPFG以及其他类型的波长询问式RI传感器（如环形谐振器、表面等离子体共振传感器和法布里-珀罗干涉传感器）相比，这种新型LPFG具有更高的灵敏度，在1.4436 - 1.4489的RI范围内灵敏度达到10,792.45 nm/RIU（RI单位）。
