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Appl Opt. 2009 Nov 1;48(31):G33-7. doi: 10.1364/AO.48.000G33.

Stable optical trapping of latex nanoparticles with ultrashort pulsed illumination.

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Deptartment of Chemistry, Indian Institute of Technology , Kanpur UP-208016, India.


Here we report how ultrafast pulsed illumination at low average power results in a stable three-dimensional (3D) optical trap holding latex nanoparticles which is otherwise not possible with continuous wave lasers at the same power level. The gigantic peak power of a femtosecond pulse exerts a huge instantaneous gradient force that has been predicted theoretically earlier and implemented for microsecond pulses in a different context by others. In addition, the resulting two-photon fluorescence allows direct observation of trapping events by providing intrinsic 3D resolution.

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