Abstract

The transverse trapping forces on a dielectric sphere located at an oil-water interface are theoretically investigated with the ray-optics model. The transverse trapping forces rely on the internal property of the particle-interface system, and increase with either the decrease of three phase contact angles at the oil-water interface or the use of oil phase with low refractive index. The numerical results also show that the transverse trapping forces can be improved by either decreasing the numerical aperture of the microscope objective or shrinking the diameter of the trapping laser beam.

© 2010 Chinese Optics Letters

Calculation of optical trapping forces on a dielectric sphere in the ray optics regime produced by a radially polarized laser beam

Hikaru Kawauchi, Kazuhiro Yonezawa, Yuichi Kozawa, and Shunichi Sato
Opt. Lett. 32(13) 1839-1841 (2007)

Ray optics calculation of the radiation forces exerted on a dielectric sphere in an evanescent field

John Y. Walz
Appl. Opt. 38(25) 5319-5330 (1999)

Axial optical trapping forces on two particles trapped simultaneously by optical tweezers

Shenghua Xu, Yinmei Li, and Liren Lou
Appl. Opt. 44(13) 2667-2672 (2005)

Optical trapping of a spherically symmetric sphere in the ray-optics regime: a model for optical tweezers upon cells

Yi-Ren Chang, Long Hsu, and Sien Chi
Appl. Opt. 45(16) 3885-3892 (2006)

Alternate analytic formulation of optical force on a dielectric sphere in the ray optics limit

Anita Devi and Arijit K. De
J. Opt. Soc. Am. B 35(2) 244-250 (2018)