Open AccessEfficient optical trapping with cylindrical vector beams
Author(s) -
Habib Moradi,
Vahid Shahabadi,
Ebrahim Madadi,
Ebrahim Karimi,
Faegheh Hajizadeh
Publication year - 2019
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.007266
Subject(s) - optical tweezers , optics , optical force , numerical aperture , polarization (electrochemistry) , physics , gaussian beam , trapping , beam (structure) , lens (geology) , radial polarization , aperture (computer memory) , light beam , laser , laser beams , laser beam quality , wavelength , ecology , chemistry , acoustics , biology
Radially and azimuthally polarized beams can create needle-like electric and magnetic fields under tight focusing conditions, respectively, and thus have been highly recommended for optical manipulation. There have been reports on the superiority of these beams over the conventional Gaussian beam for providing a larger optical force in single beam optical trap. However, serious discrepancies in their experimental results prevent one from concluding this superiority. Here, we theoretically and experimentally study the impact of different parameters - such as spherical aberration, the numerical aperture of the focusing lens, and the particles' size - on optical trapping stiffness of radially, azimuthally, and linearly polarized beams. The result of calculations based on generalized Lorenz-Mie theory, which is in good agreement with the experiment, reveals that the studied parameters determine which polarization state has the superiority for optical trapping. Our findings play a crucial role in the development of optical tweezers setups and, in particular, in biophysical applications when laser-induced heating in the optical tweezers applications is the main concern.