Number of the records: 1

Optically bound matter in a tractor beam

SYSNO ASEP	0451056
Document Type	A - Abstract
R&D Document Type	The record was not marked in the RIV
R&D Document Type	Není vybrán druh dokumentu
Title	Optically bound matter in a tractor beam
Author(s)	Chvátal, Lukáš (UPT-D)_{RID, ORCID, SAI} Brzobohatý, Oto (UPT-D)_{RID, ORCID, SAI} Jákl, Petr (UPT-D)_{RID, ORCID, SAI} Zemánek, Pavel (UPT-D)_{RID, SAI, ORCID}
Number of authors	4
Source Title	Invitation and Programm 116th Annual Meeting of the DGaO. - Erlangen : DGaO, 2015 S. 130
Number of pages	1 s.
Publication form	Print - P
Action	Annual Meeting of the DGaO /116./
Event date	26.05.2015-29.05.2015
VEvent location	Brno
Country	CZ - Czech Republic
Event type	EUR
Language	eng - English
Country	DE - Germany
Keywords	theoretical foundations ; diffraction theory ; micro optics
Subject RIV	BH - Optics, Masers, Lasers
Institutional support	UPT-D - RVO:68081731
Annotation	In a `tractor beam’ a particle may experience an optical recoil force directed against the total field momentum. This effect occures either with isolated particles, or mutiple-particle structures spontaneusly formed due to secondary light scattering (`optical binding’). We investigate conditions yielding the `negative’ force for the simplest stucture, a pair of identical spheres, using numerical simulations based on the exact theory of multiple particle scattering and low-Reynolds-number hydrodynamics, To model the tractor beam in our calculations, we use a wide Gaussian beam counter-reflected at a small angle, thus forming a standing wave. In such beam the pairs end up with their centers moving uniformly, separated in space roughly by an integer number of wavelenghts, while spanning none or several fringes. We show that, for a large interval or sphere radii and their specific alignment, the tractoring can be provoked by adjusting the beam angle of incidence and/or its polarisation. In addition, we find pairs which move even faster than a single sphere in its optimal beam settings.
Workplace	Institute of Scientific Instruments
Contact	Martina Šillerová, sillerova@ISIBrno.Cz, Tel.: 541 514 178
Year of Publishing	2016

Number of the records: 1