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http://dx.doi.org/10.3807/HKH.2008.19.1.080

Calculations of the Trapping Force of Optical Tweezers using FDTD Method  

Sung, Seung-Yong (Department of Mechatronics, Gwangju Institute of Science and Technology)
Lee, Yong-Gu (Department of Mechatronics, Gwangju Institute of Science and Technology)
Publication Information
Korean Journal of Optics and Photonics / v.19, no.1, 2008 , pp. 80-83 More about this Journal
Abstract
Optical tweezers are a tool that can use a tightly focused laser beam to trap and manipulate micron-sized dielectric particles that are immersed in a medium with lower refractive index. In this paper, the calculation of the trapping force of optical tweezers is presented. A nonparaxial Gaussian beam is used to represent a tightly focused Gaussian beam, and the FDTD (Finite-Difference Time-Domain) method is used for computing the electromagnetic field distributions in the dielectric medium. Scattered-field formulation is used for analytical expression of the incident fields. Using the electromagnetic field distribution from FDTD simulation, the trapping force is calculated based on Maxwell's stress tensor.
Keywords
Optical tweezers; Optical force; FDTD;
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