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Optical tweezers and their applications

Artikel i vetenskaplig tidskrift
Författare P. Polimeno
Alessandro Magazzu
M. A. Iati
F. Patti
R. Saija
C. D. Boschi
M. G. Donato
P. G. Gucciardi
P. H. Jones
Giovanni Volpe
O. M. Marago
Publicerad i Journal of Quantitative Spectroscopy & Radiative Transfer
Volym 218
Sidor 131-150
ISSN 0022-4073
Publiceringsår 2018
Publicerad vid Institutionen för fysik (GU)
Sidor 131-150
Språk en
Länkar dx.doi.org/10.1016/j.jqsrt.2018.07....
Ämnesord Optical trapping, Optical manipulation, T-matrix, Spectroscopic tweezers, Critical Casimir forces, red-blood-cells, discrete-dipole approximation, cylindrical vector, beams, single-particle dynamics, critical casimir forces, free-energy, differences, channeled wave-guide, t-matrix formalism, nonspherical, particles, anisotropic particles, Optics, Spectroscopy, rmany, v66, ps75, iences, v459, p3021
Ämneskategorier Fysik

Sammanfattning

Optical tweezers, tools based on strongly focused light, enable optical trapping, manipulation, and characterisation of a wide range of microscopic and nanoscopic materials. In the limiting cases of spherical particles either much smaller or much larger than the trapping wavelength, the force in optical tweezers separates into a conservative gradient force, which is proportional to the light intensity gradient and responsible for trapping, and a non-conservative scattering force, which is proportional to the light intensity and is generally detrimental for trapping, but fundamental for optical manipulation and laser cooling. For non-spherical particles or at intermediate (meso)scales, the situation is more complex and this traditional identification of gradient and scattering force is more elusive. Moreover, shape and composition can have dramatic consequences for optically trapped particle dynamics. Here, after an introduction to the theory and practice of optical forces with a focus on the role of shape and composition, we give an overview of some recent applications to biology, nanotechnology, spectroscopy, stochastic thermodynamics, critical Casimir forces, and active matter. (C) 2018 Elsevier Ltd. All rights reserved.

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