Longitudinal optical binding of several spherical particles studied by the coupled dipole method

0333770 - ÚPT 2010 RIV GB eng J - Journal Article
Karásek, Vítězslav - Brzobohatý, Oto - Zemánek, Pavel
Longitudinal optical binding of several spherical particles studied by the coupled dipole method.
Journal of Optics A-Pure and Applied Optics. Roč. 11, č. 3 (2009), 034009:1-9. ISSN 1464-4258
R&D Projects: GA MŠMT(CZ) LC06007; GA MŠMT OC08034
Institutional research plan: CEZ:AV0Z20650511
Keywords : optical binding * optical tweezers * optical self-arrangement * coupled dipole method * optical forces
Subject RIV: BH - Optics, Masers, Lasers
Impact factor: 1.198, year: 2009

We employed a coupled dipole method (CDM) to study theoretically the interaction among several spherical particles placed into two counter-propagating mutually incoherent Bessel beams. It has already been demonstrated that, if the intensity of the incident beam is sufficiently high, the scattered light is strong enough to self-arrange the objects in the space. Namely, the counter-propagating and incoherent Bessel beams are extremely useful to be employed because the interaction among the particles via the scattered light is not superimposed by other optical forces coming from the radiation pressure of each beam and axial gradients of the beam intensities. Therefore so-called optical binding between the particles is enhanced and leads to several stable configurations of the particles. We studied these stable configurations using the CDM for various properties of the beams and particles and we also compared these theoretical results with the experimental observations.
Permanent Link: http://hdl.handle.net/11104/0178682