Towards spatio-temporal control in optical trapping

Debjit Roy; Arijit Kumar De; Debabrata Goswami

doi:10.1117/12.824372

Translator Disclaimer

20 August 2009 Towards spatio-temporal control in optical trapping

Debjit Roy, Arijit Kumar De, Debabrata Goswami

Author Affiliations +

Proceedings Volume 7400, Optical Trapping and Optical Micromanipulation VI; 74000G (2009) https://doi.org/10.1117/12.824372
Event: SPIE NanoScience + Engineering, 2009, San Diego, California, United States

Abstract

Using both continuous-wave (CW) and high repetition rate femtosecond lasers, we present stable 3-dimensional trapping of 1μm polystyrene microspheres. We also stably trapped 100nm latex nanoparticles using the femtosecond mode-locked laser at a very low average power where the CW lasers cannot trap, demonstrating the significance of the fleeting temporal existence of the femtosecond pulses. Trapping was visualized through dark-field microscopy as well as through a noise free detection using two-photon fluorescence as a diagnostics tool owing to its intrinsic 3- dimensional resolution. Comparison between a Gaussian versus a flat-top Gaussian beam profile demonstrates the importance of laser spatial mode in optical trapping.

Citation Download Citation

Debjit Roy, Arijit Kumar De, and Debabrata Goswami "Towards spatio-temporal control in optical trapping", Proc. SPIE 7400, Optical Trapping and Optical Micromanipulation VI, 74000G (20 August 2009); https://doi.org/10.1117/12.824372

ACCESS THE FULL ARTICLE