Abstract
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.
©2004 Optical Society of America
Full Article | PDF ArticleMore Like This
H. Little, C.T.A. Brown, V. Garcés-Chávez, W. Sibbett, and K. Dholakia
Opt. Express 12(11) 2560-2565 (2004)
Tanya K. Lake, Antonia E. Carruthers, Lynn Paterson, Margaret Taylor, Frank Gunn-Moore, John W. Allen, Wilson Sibbett, and Kishan Dholakia
Opt. Express 12(4) 670-678 (2004)
Yuebing Li, Yaqiang Qin, Heqiang Wang, Lu Huang, Honglian Guo, and Yuqiang Jiang
Opt. Express 32(7) 12358-12367 (2024)