Forces on a nanoparticle in an optical trap

Forces on a nanoparticle in an optical trap are analysed. Brownian motion is found to be one of the major challenges to trap a nanoparticle. Accordingly, suitable spatial electric field distribution of laser beam is suggested to enhance the trapping force on a nanoparticle. Theoretical analysis is c...

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Bibliographic Details
Published in:arXiv.org 2008-10
Main Authors: Choudhury, Kaushik, Andrews, Joseph Thomas, Sen, Pranay Kumar, Sen, Pratima
Format: Article
Language:English
Subjects:
Brownian motion
Buffer solutions
Cadmium sulfide
Electric fields
Laser beams
Lasers
Nanoparticles
Neodymium lasers
Numerical analysis
Optical traps
Quantum dots
Semiconductor lasers
YAG lasers
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Summary:Forces on a nanoparticle in an optical trap are analysed. Brownian motion is found to be one of the major challenges to trap a nanoparticle. Accordingly, suitable spatial electric field distribution of laser beam is suggested to enhance the trapping force on a nanoparticle. Theoretical analysis is carried out to obtain conditions for stable optical trap by incorporating the temperature variation at large laser intensities. Numerical analysis is made for single quantum dot of CdS in buffer solution irradiated by an Nd:YAG laser.
ISSN:2331-8422