title: Stable optical trapping of latex nanoparticles with ultrashort pulsed illumination.
abstract: 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.
authors.affiliation: Deptartment of Chemistry, Indian Institute of Technology , Kanpur UP-208016, India.
authors.forename: Arijit Kumar
authors.initials: AK
authors.lastname: De
authors.forename: Debjit
authors.initials: D
authors.lastname: Roy
authors.forename: Aveek
authors.initials: A
authors.lastname: Dutta
authors.forename: Debabrata
authors.initials: D
authors.lastname: Goswami
mesh_terms: D007840:Latex / Q000737:chemistry* / Q000528:radiation effects*; D008029:Lighting / Q000379:methods*; D053758:Nanoparticles / Q000737:chemistry* / Q000528:radiation effects*; D052898:Optical Tweezers; D011829:Radiation Dosage
chemical_list: D007840:Latex