Abstract
We report an enhancement in the corner frequency of an optically trapped non-magnetic microsphere in the plane perpendicular to the laser propagation direction on addition of ferrofluid to the suspension medium. We conjecture that a directed motion of the nanoparticles toward the trap in this plane is responsible for the augmentation. Changes in the corner frequency in the presence of external magnetic field gradients lend credence to this conjecture. Corner frequency augmentation is also observed when zinc oxide nanoparticles are used. Here, however, no further changes are seen in the presence of magnetic field gradients.
© 2020 Optical Society of America
Full Article | PDF ArticleMore Like This
Yuebing Li, Yaqiang Qin, Heqiang Wang, Lu Huang, Honglian Guo, and Yuqiang Jiang
Opt. Express 32(7) 12358-12367 (2024)
Ying Li, Guanghao Rui, Sichao Zhou, Bing Gu, Yanzhong Yu, Yiping Cui, and Qiwen Zhan
Opt. Express 28(19) 27808-27822 (2020)
José A. Rodrigo, Mercedes Angulo, and Tatiana Alieva
Photon. Res. 9(1) 1-12 (2021)