Trap stiffness modification of an optically trapped microsphere through directed motion of nanoparticles

Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/7490

Title:	Trap stiffness modification of an optically trapped microsphere through directed motion of nanoparticles
Authors:	Iyengar, Shruthi Subhash Praveen, P. Ananthamurthy, Sharath Bhattacharya, Sarbari
Issue Date:	Jun-2020
Publisher:	Optical Society of America
Citation:	Applied Opitcs, 2020, Vol.59, p5114-5123
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.
Description:	Restricted Access
URI:	http://hdl.handle.net/2289/7490
ISSN:	1559-128X 2155-3165 (online)
Alternative Location:	https://doi.org/10.1364/AO.389500
Copyright:	2020 Optical Society of America
Appears in Collections:	Research Papers (LAMP)

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