Observation of selective optical manipulation of particles in acoustic levitation

被引:5
|
作者
Dumy, Gabriel [1 ,2 ]
Hoyos, Mauricio [1 ]
Aider, Jean-Luc [1 ]
机构
[1] Univ Paris Diderot, Sorbonne Univ, Paris Sci & Lettres Univ,Sorbonne Paris Cite,CNRS, Phys & Mecan Milieux Heterogenes,Ecole Super Phys, F-75005 Paris, France
[2] Sorbonne Paris Cite, Paris Descartes, Paris, France
来源
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA | 2019年 / 146卷 / 06期
关键词
RADIATION FORCE; CELL;
D O I
10.1121/1.5139640
中图分类号
O42 [声学];
学科分类号
070206 ; 082403 ;
摘要
Acoustic Radiation Force is commonly used to create stable large-scale aggregates of particles in levitation (so-called "acoustic levitation") in a micro-cavity. The authors show in the following work that this well-known and well-controlled aggregation process can be reversed without contact or external flow if the aggregated particles are enlightened with the proper optical wavelength. This coupled optics and acoustics effect has been observed with various kinds of particles and different optic wavelengths, showing high reproducibility. The phenomenon is studied using fluorescent micro-metric polystyrene particles without flow, and the effects of acoustic energy and illumination power have been quantitatively assessed. It is then exploited to separate a mix of particles with identical mechanical properties based on their different optic absorption. If the phenomenon is not well understood, some possible mechanisms are proposed and discussed that could be responsible for the rapid ejection of the objects in levitation from the illuminated area. Since it is a tag free phenomenon that does not need high energies to happen and since it works with biological objects such as algae, red blood cells, and bacteria, it may open the way to a broad range of applications. (C)2019 Acoustical Society of America.
引用
收藏
页码:4557 / 4568
页数:12
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