Optical binding of polystyrene particles in tractor beam

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081731%3A_____%2F18%3A00494359" target="_blank" >RIV/68081731:_____/18:00494359 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Optical binding of polystyrene particles in tractor beam

Popis výsledku v původním jazyce

The motion of a particle illuminated by a laser beam is usually driven by the photon flow duento the radiation pressure and therefore for particle trapping, one has to employ gradient forces. But in a tractor beam, objects are illuminated by the uniform light intensity and even so they can be pulled against the beam propagation. There have been developed several techniques how to create such a tractor beam. In our case, the tractor beam is created by two identical Gaussian beams that interfere under the defined angle. It creates thenstanding wave, where in the transversal plane the particle is trapped by means of the gradientnforce, but in the total beam propagation direction, the particle manipulation is driven by the non-conservative force. It is remarkable that this force can for the specific combinations ofnparameters pull the micro-particle against the beam propagation. This kind of behavior isnbecause of the particle scattering where the majority of the incident photons is scattered in the forward direction and, based on the principle of action and reaction, the transfer ofnmomentum leads to a backward movement of the object. The pushing and pulling force isnsensitive to the polarization of the laser beam, its incident angle and the particle size so thisntechnique can be used for example for sorting of objects of different sizes.

Název v anglickém jazyce

Optical binding of polystyrene particles in tractor beam

Popis výsledku anglicky

The motion of a particle illuminated by a laser beam is usually driven by the photon flow duento the radiation pressure and therefore for particle trapping, one has to employ gradient forces. But in a tractor beam, objects are illuminated by the uniform light intensity and even so they can be pulled against the beam propagation. There have been developed several techniques how to create such a tractor beam. In our case, the tractor beam is created by two identical Gaussian beams that interfere under the defined angle. It creates thenstanding wave, where in the transversal plane the particle is trapped by means of the gradientnforce, but in the total beam propagation direction, the particle manipulation is driven by the non-conservative force. It is remarkable that this force can for the specific combinations ofnparameters pull the micro-particle against the beam propagation. This kind of behavior isnbecause of the particle scattering where the majority of the incident photons is scattered in the forward direction and, based on the principle of action and reaction, the transfer ofnmomentum leads to a backward movement of the object. The pushing and pulling force isnsensitive to the polarization of the laser beam, its incident angle and the particle size so thisntechnique can be used for example for sorting of objects of different sizes.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

10306 - Optics (including laser optics and quantum optics)

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Recent Trends in Charged Particle Optics and Surface Physics Instrumentation. Proceedings of the 16th International Seminar

ISBN

978-80-87441-23-7

ISSN

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e-ISSN

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Počet stran výsledku

2

Strana od-do

12-13

Název nakladatele

Institute of Scientific Instruments The Czech Academy of Sciences

Místo vydání

Brno

Místo konání akce

Skalský dvůr

Datum konání akce

4. 6. 2018

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

000450591400002