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 | |
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)