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