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Hui Luo

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Proceedings Article | 4 April 2023 Paper

Displacement detection based on four-fiber bundle in dual-beam fiber-optic traps

Anni Chen, Hui Luo, Zhijie Chen, Haining Feng, Tengfang Kuang, Hui An, Xiang Han, Xiong Wei, Guangzong Xiao

Proceedings Volume 12617, 126170F (2023) https://doi.org/10.1117/12.2663034

KEYWORDS: Particles, Fiber optics, Optical tweezers, Geometrical optics, Single mode fibers, Sensors, Objectives, Multimode fibers, Light scattering

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In the traditional optical traps, the displacement of the trapped particle is usually detected by measuring the forward scattered (FS) light and back-scattered (BS) light. However, in the dual-beam fiber-optic traps, it is difficult to using the FS light and BS light to achieve the displacement detection. As mentioned in our previous work, the side-scattered light of the trapped particle can also be used for displacement detection and achieve a large linear range of the displacement detection. In this paper, we furtherly use a four-fiber bundle, rather than traditional quadrant photodiode (QPD) to collect the side-scattered light from trapped particle in the dual-beam fiber-optic trap. The power of the collected light in the cores of the fiber bundle is monitored by multiple detectors, and later operated for differential signals to denote the displacement of the particle. To achieve better displacement detection performance, we have analyzed the influence of core radius r, numerical aperture NA, and core interval Δ based on the simulations using a geometrical optics model. The results show that, high sensitivity and large linear range can be realized by optimizing these parameters. The proposed detection method is easy to integrate into a dual-beam fiber-optic trap, which provides a pathway for optical trapping systems with all fiber devises.

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