Yang Minwei, Wang D N, Wang Ying, Liao Changrui
Department of Electrical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, PR China.
Opt Express. 2010 Feb 1;18(3):2183-9. doi: 10.1364/OE.18.002183.
A new type long period fiber grating is fabricated in all-solid photonic bandgap fiber by periodically drilling microholes using femtosecond laser pulse irradiation. Such a structure introduces a strong refractive index modulation in the waveguide structure and hence exhibits a compact grating dimension. Both the simulation and the experimental results confirm the existence of the light coupling from core mode to the LP(11) cladding mode. The refractive index sensing capability of the device has been investigated and the resonant wavelength shift corresponding to the refractive index change from 1.30 to 1.35 is 23.7 nm. The average refractive index sensitivity obtained is 537 nm/RIU (refractive index unit).
通过飞秒激光脉冲辐照周期性地在全固态光子带隙光纤中钻出微孔，制备出一种新型长周期光纤光栅。这种结构在波导结构中引入了强烈的折射率调制，因此呈现出紧凑的光栅尺寸。模拟和实验结果均证实了从纤芯模式到LP(11)包层模式的光耦合的存在。对该器件的折射率传感能力进行了研究，折射率从1.30变化到1.35时对应的谐振波长位移为23.7 nm。所获得的平均折射率灵敏度为537 nm/RIU（折射率单位）。
