Particle size measurement using a fibre-trap-based interference approach

Zhihai Liu, Lu Wang, Yu Zhang, Yaxun Zhang, Xiaoyun Tang, Chunyu Sha, Jianzhong Zhang, Jun Yang, Libo Yuan

We propose and demonstrate the measurement of the particle size using an all-fibre interference approach via a single fibre tweezer with a coaxial core fibre. The coaxial core fibre has an external annular core and a centre core. The external annular core is used to trap the microparticle and the centre core sends and receives interference signals for size measurement. The reflected lights from the fibre end face and the trapped particle surface will cause interference and the particle size is obtained from the FSR of the interference spectrum. Using this interference approach, we conduct a label-free, non-contact, and real-time particle size measurement. The proposed measurement approach can be further applied in biology, medical science, and lab-on-fibre technology research.

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