Open AccessNumerical modeling of optical levitation and trapping of the "stuck" particles with a pulsed optical tweezers
Author(s) -
Jianliao Deng,
Qing Wei,
Yuzhu Wang,
Yongqing Li
Publication year - 2005
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/opex.13.003673
Subject(s) - optical tweezers , levitation , materials science , optical force , optics , laser , trapping , pulse (music) , pulsed power , optical power , pressure gradient force , particle (ecology) , physics , power (physics) , ecology , oceanography , quantum mechanics , detector , biology , magnet , geology
We present the theoretical analysis and the numerical modeling of optical levitation and trapping of the stuck particles with a pulsed optical tweezers. In our model, a pulsed laser was used to generate a large gradient force within a short duration that overcame the adhesive interaction between the stuck particles and the surface; and then a low power continuous-wave(cw) laser was used to capture the levitated particle. We describe the gradient force generated by the pulsed optical tweezers and model the binding interaction between the stuck beads and glass surface by the dominative van der Waals force with a randomly distributed binding strength. We numerically calculate the single pulse levitation efficiency for polystyrene beads as the function of the pulse energy, the axial displacement from the surface to the pulsed laser focus and the pulse duration. The result of our numerical modeling is qualitatively consistent with the experimental result.