Chen Ling, Liu Bin, Markwell Christopher, Liu Juan, He Xing-Dao, Ghassemlooy Zabih, Torun Hamdi, Fu Yong-Qing, Yuan Jinhui, Liu Qiang, Farrell Gerald, Wu Qiang
State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, China.
Key Laboratory of Opto-Electronic Information Science and Technology of Jiangxi Province, Nanchang Hangkong University, Nanchang 330063, China.
Sci Adv. 2024 May 31;10(22):eadk8357. doi: 10.1126/sciadv.adk8357. Epub 2024 May 29.
Nanomechanical measurements, especially the detection of weak contact forces, play a vital role in many fields, such as material science, micromanipulation, and mechanobiology. However, it remains a challenging task to realize the measurement of ultraweak force levels as low as nanonewtons with a simple sensing configuration. In this work, an ultrasensitive all-fiber nanonewton force sensor structure based on a single-mode-tapered U-shape multimode-single-mode fiber probe is proposed and experimentally demonstrated with a limit of detection of ~5.4 nanonewtons. The use of the sensor is demonstrated by force measurement on a human hair sample to determine the spring constant of the hair. The results agree well with measurements using an atomic force microscope for the spring constant of the hair. Compared with other force sensors based on optical fiber in the literature, the proposed all-fiber force sensor provides a substantial advancement in the minimum detectable force possible, with the advantages of a simple configuration, ease of fabrication, and low cost.
纳米力学测量，尤其是弱接触力的检测，在材料科学、微操纵和力学生物学等许多领域发挥着至关重要的作用。然而，采用简单的传感配置来实现低至纳牛顿的超弱力水平的测量仍然是一项具有挑战性的任务。在这项工作中，提出了一种基于单模锥形U形多模-单模光纤探头的超灵敏全光纤纳牛顿力传感器结构，并通过实验证明其检测极限约为5.4纳牛顿。通过对人发样本进行力测量以确定头发的弹簧常数，展示了该传感器的用途。所得结果与使用原子力显微镜测量头发弹簧常数的结果吻合良好。与文献中其他基于光纤的力传感器相比，所提出的全光纤力传感器在最低可检测力方面有了实质性的进步，具有配置简单、易于制造和成本低的优点。
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