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Near-field optical trapping with an ultrashort pulsed laser beam

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posted on 2024-07-09, 18:57 authored by Smitha Kuriakose, Dru Morrish, Xiaosong Gan, James ChonJames Chon, Kishan Dholakia, Min Gu
We report the focused evanescent optical trapping of nonfluorescent and fluorescent dielectric microspheres using a femtosecond laser. The experiment confirms that the trapping efficiency increases with the size of the particles. As a result, a pulsed laser has been used to trap particles in the Mie regime and to excite whispering gallery modes in them. The excitation of whispering gallery modes in a near-field femtosecond trap shows a significant suppression of the two-photon fluorescence background with an improvement of the photon storage factor by 46%, as compared to far-field two-photon excitation.

Funding

Australian Research Council

History

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ISSN

0003-6951

Journal title

Applied Physics Letters

Volume

92

Issue

8

Article number

article no. 081108

Pagination

081108-

Publisher

American Institute of Physics

Copyright statement

Copyright © 2008 American Institute of Physics. The published version is reproduced in accordance with the copyright policy of the publisher.

Language

eng

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