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Non-linear optical effect in femtosecond laser trapping:

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In optical trapping using laser tweezers usually a continuous wave laser is used. When femtosecond pulsed lasers are used the trapping force (and potential) is dramatically modulated by optical nonlinearity.

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Can we estimate the force (and potential) under femtosecond pulsed excitation for different particle sizes?

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Read about our theory work on femtosecond laser trapping:

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In the dipole limit

Optics Express, 21485-21496, 24 (9), 2016.

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In the geometric optics limit:

Journal of Optics (IOP Publishing), 065504 (1-6), 19 (6), 2017.

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A generalized theory:

Physical Review A, 023856 (1-9), 96 (2), 2017.