Analysis of optical force and optical potential well for trapping particles near a light-illuminated slit using a finite-difference time-domain method

Citation
Wh. Choi et al., Analysis of optical force and optical potential well for trapping particles near a light-illuminated slit using a finite-difference time-domain method, JPN J A P 1, 39(7A), 2000, pp. 3961-3970
Citations number
24
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Volume
39
Issue
7A
Year of publication
2000
Pages
3961 - 3970
Database
ISI
SICI code
Abstract
We analyze numerically the optical force and the optical potential well for trapping a circular-cylinder type object in a near zone of a light-illumin ated metal slit. Our analysis is based on the finite-difference formulas of the optical force and the optical potential energy to he developed, a fini te-difference solution of Maxwell's curl equations, and an absorbing bounda ry condition to define the problem in a finite region. We show that trappin g forces induced by the field gradient produced in the vicinity of a slit c an provide a two-dimensional potential well for trapping nanometric particl es against a gravitational force. The results may be used to predict the pr operties of gradient-force traps in a more complicated system.