Near-field optical trapping with an ultrashort pulsed laser beam

Smitha Kuriakose; Dru Morrish; Xiaosong Gan; James W.M. Chon; Kishan Dholakia; Min Gu

doi:10.1063/1.2888771

Near-field optical trapping with an ultrashort pulsed laser beam

Smitha Kuriakose, Dru Morrish, Xiaosong Gan, James W.M. Chon, Kishan Dholakia, Min Gu

Department of Physics

Research output: Contribution to journal › Article

7 Citations (Scopus)

Abstract

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.

Original language	English
Article number	081108
Journal	Applied Physics Letters
Volume	92
Issue number	8
DOIs	https://doi.org/10.1063/1.2888771
Publication status	Published - 2008

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.2888771

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Kuriakose, S., Morrish, D., Gan, X., Chon, J. W. M., Dholakia, K., & Gu, M. (2008). Near-field optical trapping with an ultrashort pulsed laser beam. Applied Physics Letters, 92(8), [081108]. https://doi.org/10.1063/1.2888771

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AU - Gu, Min

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AB - 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.

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