https://doi.org/10.1140/epjd/s10053-021-00333-y
Regular Article – Optical Phenomena and Photonics
Enhancing the performance of the counter-propagating dual-beam optical trap with the asymmetric configuration
College of Advanced Interdisciplinary Studies, National University of Defense Technology, 410073, Changsha, Hunan, China
Received:
2
September
2021
Accepted:
16
December
2021
Published online:
19
January
2022
The trapping stiffness and width are two important parameters to characterize a counter-propagating dual-beam optical trap. We present two types of asymmetric counter-propagating dual-beam optical trap with the different numerical aperture (NA) and trapping power to eliminate the multi-equilibrium positions when two foci of the optical trap are not coincided. Meanwhile, the asymmetric dual-beam trap with the different NA enhances the axial trapping width and stiffness over five and three times, respectively, higher than the standard dual-beam trap with the higher and same average NA. Besides, it increases the transverse trapping stiffness when two foci are not coincided. The asymmetric dual-beam optical trap will benefit the future applications for the study of precision measurement, basic physics and biomaterials.
© The Author(s), under exclusive licence to EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature 2022