Zhi Yanyan, Li Xin, Li Yuanpeng, Li Jie, Guan Bai-Ou
Opt Express. 2020 Mar 16;28(6):8853-8861. doi: 10.1364/OE.389959.
Microfiber gratings with diameters in the subwavelength scale have recently attracted much attention for developments of sensitive sensors; however, a specific structure is usually chosen for sensing one parameter according to the optical response. In this work, a superstructure microfiber grating combined with microfiber Bragg grating and long-period microfiber grating is reported for the first time. The proposed superstructure is formed by ultraviolet laser inscription and femtosecond laser scratching techniques, which simultaneously endows the unique properties of the two individual gratings. The reflection and transmission spectral characteristics differing to conventional counterparts are demonstrated. The responsivities of the two gratings to temperature, strain and refractive index are investigated, providing a possibility for simultaneous multi-parameter sensing.
直径处于亚波长尺度的微光纤光栅近来在灵敏传感器的研发中备受关注；然而，通常会根据光学响应选择特定结构来传感一个参数。在这项工作中，首次报道了一种结合了微光纤布拉格光栅和长周期微光纤光栅的超结构微光纤光栅。所提出的超结构由紫外激光写入和飞秒激光刻划技术形成，这同时赋予了两种单独光栅的独特特性。展示了与传统同类光栅不同的反射和透射光谱特性。研究了这两种光栅对温度、应变和折射率的响应度，为同时进行多参数传感提供了可能性。
