Fast identification and size estimation of single-levitated nanoparticles for vacuum optomechanics

Posted on 13.09.2021 - 17:07
Optical trapping of single nanoparticles in a vacuum has various applications in both precise measurements and fundamental physics. However, until now, the number and size of the randomly loaded nanoparticles in an optical trap are difficult to determine unless in vacuum. In this letter, an efficient method for single nanoparticle identification and size estimation in an optical tweezer system before the evacuation of air was proposed and demonstrated experimentally, using scattering light from levitated particles. The particle radii deduced from scattering light power in our proposal and from the kinetic theory of particles in gas match well (with differences of less than 10%). With sample particles with radii ranging 50–100 nm, this method offers a pre-selection rule where over half of the trapped particles are verified as single particles, as demonstrated. Such particle analysis method works also for identification and size estimation of levitated diamond particle, gold particle, and other plasmonic particles and can be applied to discovering of novel scattering effects.

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HU, Huizhu; Li, Cuihong; Jing, Jiang; Zhou, Leiming; Fu, Zhenhai; Gao, Xiao-Wen; et al. (2021): Fast identification and size estimation of single-levitated nanoparticles for vacuum optomechanics. The Optical Society. Collection. https://doi.org/10.6084/m9.figshare.c.5507295.v2
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AUTHORS (8)

Huizhu HU
Cuihong Li
Jiang Jing
Leiming Zhou
Zhenhai Fu
Xiao-Wen Gao
Nan Li
Xingfan Chen

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