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Displacement Detection Decoupling in Counter-Propagating Dual-Beams Optical Tweezers with Large-Sized Particle

by Xunmin Zhu 1, Nan Li 1,*, Jianyu Yang 1, Xingfan Chen 1,2 and Huizhu Hu 1,2
1
State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou 310027, China
2
Quantum Sensing Center, Zhejiang Lab, Hangzhou 310000, China
*
Author to whom correspondence should be addressed.
Sensors 2020, 20(17), 4916; https://doi.org/10.3390/s20174916
Received: 23 July 2020 / Revised: 24 August 2020 / Accepted: 25 August 2020 / Published: 31 August 2020
(This article belongs to the Section Optical Sensors)
As a kind of ultra-sensitive acceleration sensing platform, optical tweezers show a minimum measurable value inversely proportional to the square of the diameter of the levitated spherical particle. However, with increasing diameter, the coupling of the displacement measurement between the axes becomes noticeable. This paper analyzes the source of coupling in a forward-scattering far-field detection regime and proposes a novel method of suppression. We theoretically and experimentally demonstrated that when three variable irises are added into the detection optics without changing other parts of optical structures, the decoupling of triaxial displacement signals mixed with each other show significant improvement. A coupling detection ratio reduction of 49.1 dB and 22.9 dB was realized in radial and axial directions, respectively, which is principally in accord with the simulations. This low-cost and robust approach makes it possible to accurately measure three-dimensional mechanical quantities simultaneously and may be helpful to actively cool the particle motion in optical tweezers even to the quantum ground state in the future. View Full-Text
Keywords: optical tweezers; optical trap; acceleration; decoupling optical tweezers; optical trap; acceleration; decoupling
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Zhu, X.; Li, N.; Yang, J.; Chen, X.; Hu, H. Displacement Detection Decoupling in Counter-Propagating Dual-Beams Optical Tweezers with Large-Sized Particle. Sensors 2020, 20, 4916.

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