Long-Distance Axial Trapping with Focused Annular Laser Beams

Focusing an annular laser beam can improve the axial trapping efficiency due to the reduction of the scattering force, which enables the use of a lower numerical aperture (NA) objective lens with a long working distance to trap particles in deeper aqueous medium. In this paper, we present an axicon-...

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Detalles Bibliográficos
Autores principales: Lei, Ming, Li, Ze, Yan, Shaohui, Yao, Baoli, Dan, Dan, Qi, Yujiao, Qian, Jia, Yang, Yanlong, Gao, Peng, Ye, Tong
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2013
Materias:
Research Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3591451/
https://www.ncbi.nlm.nih.gov/pubmed/23505449
http://dx.doi.org/10.1371/journal.pone.0057984
Descripción
Sumario:Focusing an annular laser beam can improve the axial trapping efficiency due to the reduction of the scattering force, which enables the use of a lower numerical aperture (NA) objective lens with a long working distance to trap particles in deeper aqueous medium. In this paper, we present an axicon-to-axicon scheme for producing parallel annular beams with the advantages of higher efficiency compared with the obstructed beam approach. The validity of the scheme is verified by the observation of a stable trapping of silica microspheres with relatively low NA microscope objective lenses (NA = 0.6 and 0.45), and the axial trapping depth of 5 mm is demonstrated in experiment.

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