Pushing the limit: investigation of hydrodynamic forces on a trapped particle kicked by a laser pulse

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Pushing the limit : investigation of hydrodynamic forces on a trapped particle kicked by a laser pulse. / Villadsen, Naja; Andreasen, Daniel Ø; Hagelskjær, Jesper; Thøgersen, Jan; Imparato, Alberto; Keiding, Søren Rud.

In: Optics Express, Vol. 23, No. 10, 2015, p. 13141-52.

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@article{273284bc3ed8424791e34b2fcc74faba,
title = "Pushing the limit: investigation of hydrodynamic forces on a trapped particle kicked by a laser pulse",
abstract = "We introduce a new optical technique where a train of short optical pulses is utilized to disturb a trapped microscopic particle. Using fast (250 kHz) and accurate (nm) detection of the position of the particle, accurately synchronized to the repetition rate of the laser pulses, we can coherently superimpose the displacement caused by each individual laser pulse. Thereby we are able to both bypass the influence from the Brownian motion of the trapped particle and to simultaneously increase the ability to localize its average trajectory by n, where n is the number of repetitive pulses. In the results presented here we utilize a train of 1200 pulses to kick a 5 μm polystyrene sphere and obtain a spatial resolution corresponding to 0.09 nm and a time resolution of 4 μs. The magnitude of the optical force pushing the particle corresponds to ∼ 104g and enables an investigation of both the hydrodynamical drag and the inertial effects caused by the particle and the surrounding liquid. Our results enables a more accurate testing of the existing extended models for the hydrodynamic drag and we discuss the observed agreement between experiments and theory.",
author = "Naja Villadsen and Andreasen, {Daniel {\O}} and Jesper Hagelskj{\ae}r and Jan Th{\o}gersen and Alberto Imparato and Keiding, {S{\o}ren Rud}",
note = "Open Access DOI: 10.1364/OE.23.013141",
year = "2015",
doi = "10.1364/OE.23.013141",
language = "English",
volume = "23",
pages = "13141--52",
journal = "Optics Express",
issn = "1094-4087",
publisher = "The Optical Society",
number = "10",

}

RIS

TY - JOUR

T1 - Pushing the limit

T2 - investigation of hydrodynamic forces on a trapped particle kicked by a laser pulse

AU - Villadsen, Naja

AU - Andreasen, Daniel Ø

AU - Hagelskjær, Jesper

AU - Thøgersen, Jan

AU - Imparato, Alberto

AU - Keiding, Søren Rud

N1 - Open Access DOI: 10.1364/OE.23.013141

PY - 2015

Y1 - 2015

N2 - We introduce a new optical technique where a train of short optical pulses is utilized to disturb a trapped microscopic particle. Using fast (250 kHz) and accurate (nm) detection of the position of the particle, accurately synchronized to the repetition rate of the laser pulses, we can coherently superimpose the displacement caused by each individual laser pulse. Thereby we are able to both bypass the influence from the Brownian motion of the trapped particle and to simultaneously increase the ability to localize its average trajectory by n, where n is the number of repetitive pulses. In the results presented here we utilize a train of 1200 pulses to kick a 5 μm polystyrene sphere and obtain a spatial resolution corresponding to 0.09 nm and a time resolution of 4 μs. The magnitude of the optical force pushing the particle corresponds to ∼ 104g and enables an investigation of both the hydrodynamical drag and the inertial effects caused by the particle and the surrounding liquid. Our results enables a more accurate testing of the existing extended models for the hydrodynamic drag and we discuss the observed agreement between experiments and theory.

AB - We introduce a new optical technique where a train of short optical pulses is utilized to disturb a trapped microscopic particle. Using fast (250 kHz) and accurate (nm) detection of the position of the particle, accurately synchronized to the repetition rate of the laser pulses, we can coherently superimpose the displacement caused by each individual laser pulse. Thereby we are able to both bypass the influence from the Brownian motion of the trapped particle and to simultaneously increase the ability to localize its average trajectory by n, where n is the number of repetitive pulses. In the results presented here we utilize a train of 1200 pulses to kick a 5 μm polystyrene sphere and obtain a spatial resolution corresponding to 0.09 nm and a time resolution of 4 μs. The magnitude of the optical force pushing the particle corresponds to ∼ 104g and enables an investigation of both the hydrodynamical drag and the inertial effects caused by the particle and the surrounding liquid. Our results enables a more accurate testing of the existing extended models for the hydrodynamic drag and we discuss the observed agreement between experiments and theory.

UR - https://www.osapublishing.org/oe/abstract.cfm?uri=oe-23-10-13141

U2 - 10.1364/OE.23.013141

DO - 10.1364/OE.23.013141

M3 - Journal article

C2 - 26074567

VL - 23

SP - 13141

EP - 13152

JO - Optics Express

JF - Optics Express

SN - 1094-4087

IS - 10

ER -