Controllable rotation of microsphere chain in dual-beam fiber-optic trap with transverse offset

Xinlin Chen; Guangzong Xiao; Xiang Han; Wei Xiong; Hui Luo; Kaiyong Yang

doi:10.1117/12.2272151

25 August 2017 Controllable rotation of microsphere chain in dual-beam fiber-optic trap with transverse offset

Xinlin Chen, Guangzong Xiao, Xiang Han, Wei Xiong, Hui Luo, Kaiyong Yang

Proceedings Volume 10347, Optical Trapping and Optical Micromanipulation XIV; 1034732 (2017) https://doi.org/10.1117/12.2272151
Event: SPIE Nanoscience + Engineering, 2017, San Diego, California, United States

Abstract

Controllable rotation of the trapped microscopic objects has traditionally been thought of one of the most valuable optical manipulation techniques. The controllable rotation of a microsphere chain was achieved by the dual-beam fiber-optic trap with transverse offset. The experimental device was made up of a PDMS chip housing two counter-propagating fibers across a microfluidic flow channel. Each fiber was coupled with different laser diode source to avoid the generation of coherent interference, both operating at a wavelength of 980 nm. Each fiber was attached to a translation stage to adjust the transverse offset distance. The polystyrene microspheres with diameter of 10 μm were chosen as the trapped particles. The microfluidic flow channel of the device was flushed with the polystyrene microspheres solution by the mechanical fluid pump. At the beginning, the two fibers were strictly aligned to each other. Five microspheres were captured as a chain parallel to the axis of the fibers. When introducing a transverse offset to the counter-propagating fibers by adjusting the translation stages, the microsphere chain was observed to rotating in the trap center. When the offset distance was set as 9 μm, the rotation period is approximately 1.2s. A comprehensive analysis has been presented of the characteristics of the rotation. The functionality of rotated chain could be extended to applications requiring microfluidic mixing or to improving the reaction speed in a localized environment, and is generally applicable to biological and medical research.

Citation Download Citation

Xinlin Chen, Guangzong Xiao, Xiang Han, Wei Xiong, Hui Luo, and Kaiyong Yang "Controllable rotation of microsphere chain in dual-beam fiber-optic trap with transverse offset", Proc. SPIE 10347, Optical Trapping and Optical Micromanipulation XIV, 1034732 (25 August 2017); https://doi.org/10.1117/12.2272151

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KEYWORDS

Microfluidics

Fiber optics

Optical manipulation

Particles

Analytical research

Fiber coupled lasers

Fiber couplers

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