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 › peer-review

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

Bibliographical note

Funding Information:
The authors thank the Australian Research Council for its support.

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.2888771

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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.",

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AU - Kuriakose, Smitha

AU - Morrish, Dru

AU - Gan, Xiaosong

AU - Chon, James W.M.

AU - Dholakia, Kishan

AU - Gu, Min

N1 - Funding Information: The authors thank the Australian Research Council for its support.

PY - 2008

Y1 - 2008

N2 - 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.

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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Near-field optical trapping with an ultrashort pulsed laser beam

Abstract

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All Science Journal Classification (ASJC) codes

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