Počet záznamů: 1
Optical binding of polystyrene particles in tractor beam
- 1.0494359 - ÚPT 2019 RIV CZ eng C - Konferenční příspěvek (zahraniční konf.)
Damková, Jana - Chvátal, Lukáš - Oulehla, Jindřich - Ježek, Jan - Brzobohatý, Oto - Zemánek, Pavel
Optical binding of polystyrene particles in tractor beam.
Recent Trends in Charged Particle Optics and Surface Physics Instrumentation. Proceedings of the 16th International Seminar. Brno: Institute of Scientific Instruments The Czech Academy of Sciences, 2018, s. 12-13. ISBN 978-80-87441-23-7.
[Recent Trends in Charged Particle Optics and Surface Physics Instrumentation. Skalský dvůr (CZ), 04.06.2018-08.06.2018]
Grant CEP: GA ČR(CZ) GA14-16195S; GA TA ČR TE01020233; GA MŠk(CZ) LO1212; GA MŠk ED0017/01/01
Institucionální podpora: RVO:68081731
Klíčová slova: optical binding * self-organization * optical force * tractor beam * holographic video microscopy
Kód oboru RIV: JA - Elektronika a optoelektronika, elektrotechnika
Obor OECD: Optics (including laser optics and quantum optics)
The motion of a particle illuminated by a laser beam is usually driven by the photon flow due
to 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 the
standing wave, where in the transversal plane the particle is trapped by means of the gradient
force, 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 of
parameters pull the micro-particle against the beam propagation. This kind of behavior is
because 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 of
momentum leads to a backward movement of the object. The pushing and pulling force is
sensitive to the polarization of the laser beam, its incident angle and the particle size so this
technique can be used for example for sorting of objects of different sizes.
Trvalý link: http://hdl.handle.net/11104/0287587
Počet záznamů: 1