Optical Forces at the Nanoscale: Size and Electrostatic Effects

被引:36
作者
Rodriguez-Sevilla, Paloma [1 ]
Prorok, Katarzyna [2 ]
Bednarkiewicz, Artur [3 ]
Marques, Manuel I. [4 ,5 ]
Garcia-Martin, Antonio [6 ]
Sole, Jose Garcia [1 ]
Haro-Gonzalez, Patricia [1 ]
Jaque, Daniel [1 ,7 ]
机构
[1] Univ Autonoma Madrid, Dept Fis Mat, Fluorescence Imaging Grp, E-28049 Madrid, Spain
[2] Wroclaw Res Ctr EIT, Ul Stablowicka 147, PL-54066 Wroclaw, Poland
[3] Polish Acad Sci, Inst Low Temp & Struct Res, Ul Okolna 2, PL-50422 Wroclaw, Poland
[4] Univ Autonoma Madrid, IFIMAC, Dept Fis Mat, E-28049 Madrid, Spain
[5] Univ Autonoma Madrid, Inst Nicolas Cabrera, E-28049 Madrid, Spain
[6] CNM CSIC, IMN, PTM, Isaac Newton 8, E-28760 Madrid, Spain
[7] Hosp Ramon & Cajal, Inst Ramon y Cajal Invest Sanitarias, E-28034 Madrid, Spain
关键词
Nanoparticles; optical trapping size; zeta potential; UP-CONVERSION; MANIPULATION; LUMINESCENCE; TEMPERATURE; NANOPARTICLE;
D O I
10.1021/acs.nanolett.7b04804
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The reduced magnitude of the optical trapping forces exerted over sub-200 nm dielectric nanoparticles complicates their optical manipulation, hindering the development of techniques and studies based on it. Improvement of trapping capabilities for such tiny objects requires a deep understanding of the mechanisms beneath them. Traditionally, the optical forces acting on dielectric nanoparticles have been only correlated with their volume, and the size has been traditionally identified as a key parameter. However, the most recently published research results have shown that the electrostatic characteristics of a sub-100 nm dielectric particle could also play a significant role. Indeed, at present it is not clear what optical forces depend. In this work, we designed a set of experiments in order to elucidate the different mechanism and properties (i.e., size and/or electrostatic properties) that governs the magnitude of optical forces. The comparison between experimental data and numerical simulations have shown that the double layer induced at nanoparticle's surface, not considered in the classical description of nanoparticle's polarizability, plays a relevant role determining the magnitude of the optical forces. Here, the presented results constitute the first step toward the development of the dielectric nanoparticle over which enhanced optical forces could be exerted, enabling their optical manipulation for multiples purposes ranging from fundamental to applied studies.
引用
收藏
页码:602 / 609
页数:8
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