Femtosecond optical tweezers for in-situ control of two-photon fluorescence

B. Agate, C. T.A. Brown, W. Sibbett, K. Dholakia

Research output: Contribution to journalArticlepeer-review

98 Citations (Scopus)


We perform a comparison of optical tweezing using continuous wave (cw) and femtosecond lasers. Measurement of the relative Q-values in the femtosecond and cw regimes shows that femtosecond optical tweezers are just as effective as cw optical tweezers. We also demonstrate simultaneous optical tweezing and in-situ control of two-photon fluorescence (at 400nm) from dye-doped polymer microspheres. By switching the 800 nm tweezing laser source between femtosecond and cw regimes, we turned the fluorescent signal from the tweezed particle on and off while maintaining an equivalent tweezing action. Femtosecond lasers can thus be used for optical tweezing and simultaneously utilized to induce nonlinear multi-photon processes such as two-photon excitation or even photoporation.

Original languageEnglish
Pages (from-to)3011-3017
Number of pages7
JournalOptics Express
Issue number13
Publication statusPublished - 2004 Jun

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics


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