折射率
材料科学
毛细管作用
复合数
光学
变形(气象学)
光纤
光子晶体光纤
光纤传感器
纤维
低语长廊波浪
液晶
光电子学
复合材料
谐振器
物理
作者
Zhenyu Ma,Jing Sun,Sijie Zhou,WenJun Shan,Yunxiang Yan,Yongjun Liu
出处
期刊:Optics Letters
[The Optical Society]
日期:2022-11-28
卷期号:48 (1): 139-139
被引量:7
摘要
A novel, to the best of our knowledge, type of compact pH fiber sensor combined with a hydrogel based on the whispering gallery mode (WGM) is proposed and integrates a liquid crystal (LC) microdroplet in a capillary in a compact structure as small as 180 µm. In the research, the hydrogel performs both as a supporting frame and a responsive material that causes morphological deformation of the LC microdroplet with pH variation. Moreover, a new phenomenon of pH-induced LC refractive index variation is observed and applied in the pH measurement, so that the acid itself can also lead the LC microdroplet structure transition. Thus, the WGM method is applied to detect the composite effect simultaneously to improve the sensing capability. The sensitivity of the sensor in the pH range from 4.55 to 6.86 reaches 3.19 nm/pH. The response time is short, within 60 s. The simple and compact structure of the sensor reduces the cost and enhances the stability, which is of great potential for biomedical pH measurement.
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