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Proceedings Paper

Distinguishing the number of captured microspheres in dual-beam optical trap by measuring the back light signal
Author(s): Deyuan Zhou; Xinlin Chen; Guangzong Xiao; Xiang Han; Shilong Jin
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Paper Abstract

Optical traps have been widely used in a large variety of applications ranging from biophysics to nano-sciences. More than one microscopic object can be captured in an optical trap. In the practical application, it is always necessary to distinguish and control the number of captured objects in the optical trap. In this paper, a novel method has been presented to distinguish the number of trapped microspheres by measuring the intensity of back signal. Clear descent of the back signal has been observed when a microsphere is captured in the center of optical trap. The relative coupling efficiency of back signal decreases as the number of captured microspheres increases both in experiment and theory. This method contributes to miniaturization and integration of applied systems due to getting rid of the imaging system, and is generally applicable to the area of nanoparticle trapping.

Paper Details

Date Published: 24 October 2017
PDF: 6 pages
Proc. SPIE 10460, AOPC 2017: Optoelectronics and Micro/Nano-Optics, 104601B (24 October 2017); doi: 10.1117/12.2284995
Show Author Affiliations
Deyuan Zhou, National Univ. of Defense Technology (China)
Xinlin Chen, National Univ. of Defense Technology (China)
Guangzong Xiao, National Univ. of Defense Technology (China)
State Key Lab. of Transient Optics and Photonics (China)
Xiang Han, National Univ. of Defense Technology (China)
Shilong Jin, National Univ. of Defense Technology (China)

Published in SPIE Proceedings Vol. 10460:
AOPC 2017: Optoelectronics and Micro/Nano-Optics
Min Qiu; Min Gu; Xiaocong Yuan; Zhiping Zhou, Editor(s)

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