Modeling and experimental exploration of the underdamped motion of microbeads in optical tweezers

Alan Bowling; Vatsal Joshi; Mahdi Haghshenas-Jaryani

doi:10.1117/12.2530017

9 September 2019 Modeling and experimental exploration of the underdamped motion of microbeads in optical tweezers

Alan Bowling, Vatsal Joshi, Mahdi Haghshenas-Jaryani

Proceedings Volume 11083, Optical Trapping and Optical Micromanipulation XVI; 110831S (2019) https://doi.org/10.1117/12.2530017
Event: SPIE Nanoscience + Engineering, 2019, San Diego, California, United States

Abstract

This paper investigates the underdamped motion of a bead as it moves toward the focal point of an optical trap. The model used herein represents a new approach toward addressing singular perturbation problems in dynamics. The experiments involve trapping microbeads at the focal point of an optical tweezer/trap. The optical trap can accurately measure the position of a microbead only in two directions. Given experimental data, the model can be used to estimate the bead’s position in the third direction. This estimate allows an examination of the full position, velocity and acceleration of the bead, which in turn allows and investigation of its particle Reynolds number (Re_p). It is generally believed that a low Re_p implies that a small bead will exhibit overdamped motion. The velocity estimates obtained herein for three bead diameters, 1950nm, 990nm and 500nm, provide new insights into the interpretation of a low Rep in light of the underdamped motion observed in experiments.

Conference Presentation

Citation Download Citation

Alan Bowling, Vatsal Joshi, and Mahdi Haghshenas-Jaryani "Modeling and experimental exploration of the underdamped motion of microbeads in optical tweezers", Proc. SPIE 11083, Optical Trapping and Optical Micromanipulation XVI, 110831S (9 September 2019); https://doi.org/10.1117/12.2530017

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