Near-field optical trapping with an ultrashort pulsed laser beam

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

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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 languageEnglish
Article number081108
JournalApplied Physics Letters
Issue number8
Publication statusPublished - 2008

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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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].