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7 March 2018 Rotation of an optically trapped vaterite microsphere measured using rotational Doppler effect
Xinlin Chen, Guangzong Xiao, Wei Xiong, Kaiyong Yang, Hui Luo, Baoli Yao
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Optical Engineering, Vol. 57, Issue 3, 036103 (March 2018). https://doi.org/10.1117/1.OE.57.3.036103
Abstract
The angular velocity of a vaterite microsphere spinning in the optical trap is measured using rotational Doppler effect. The perfectly spherical vaterite microspheres are synthesized via coprecipitation in the presence of silk fibroin nanospheres. When trapped by a circularly polarized beam, the vaterite microsphere is uniformly rotated in the trap center. The probe beams containing two Laguerre–Gaussian beams of opposite topological charge l  =    ±  7, l  =    ±  8, and l  =    ±  9 are illuminated on the spinning vaterite. By analyzing the backscattered light, a frequency shift is observed scaling with the rotation rate of the vaterite microsphere. The multiplicative enhancement of the frequency shift proportion to the topological charge has greatly improved the measurement precision. The reliability and practicability of this approach are verified through varying the topological charge of the probe beam and the trapping laser power. In consideration of the excellent measurement precision of the rotation frequency, this technique might be generally applicable in studying the torsional properties of micro-objects.
CC BY: © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.
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Xinlin Chen, Guangzong Xiao, Wei Xiong, Kaiyong Yang, Hui Luo, and Baoli Yao "Rotation of an optically trapped vaterite microsphere measured using rotational Doppler effect," Optical Engineering 57(3), 036103 (7 March 2018). https://doi.org/10.1117/1.OE.57.3.036103
Received: 11 December 2017; Accepted: 14 February 2018; Published: 7 March 2018
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Cited by 11 scholarly publications.
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KEYWORDS
Doppler effect
Laser beam diagnostics
Signal to noise ratio
Optical tweezers
Spatial light modulators
Spherical lenses
Calcite
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