A model of Gaussian laser beam self-trapping in optical tweezers for nonlinear particles

The optical tweezers are used to trap the particles embedded in a suitable fluid. The optical trap efficiency is significantly enhanced for nonlinear particles which response to the Kerr effect. The optical transverse gradient force makes these particles’ mass density in trapping region increasing,...

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Bibliographic Details
Published in:Optical and quantum electronics 2021-08, Vol.53 (8), Article 418
Main Authors: Quang, Quy Ho, Doan, Thanh Thai, Xuan, Kien Bui, Manh, Thang Nguyen
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Computer Communication Networks
Electrical Engineering
Gaussian beams (optics)
Kerr effects
Laser beams
Lasers
Normal distribution
Optical Devices
Optical traps
Optics
Photonics
Physics
Physics and Astronomy
Refractivity
Trap efficiency
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Summary:The optical tweezers are used to trap the particles embedded in a suitable fluid. The optical trap efficiency is significantly enhanced for nonlinear particles which response to the Kerr effect. The optical transverse gradient force makes these particles’ mass density in trapping region increasing, and the Kerr medium can be created. When the laser Gaussian beam propagates through it, the self-focusing, and consequently self-trapping can appear. In this paper, a model describing the laser self-trapping in nonlinear particle solution of optical tweezers is proposed. The expressions for the Kerr effect, effective refractive index of nonlinear particle solution and the intensity distribution of reshaped Gaussian laser beam are derived, and the self-trapping of laser beam is numerically investigated. Finally, the guide properties of nonlinear particles-filled trapping region and guiding condition are analysed and discussed.
ISSN:0306-8919
1572-817X
DOI:10.1007/s11082-021-03074-9