Near-field optical trapping with an ultrashort pulsed laser beam

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

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


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

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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