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- W2072682990 abstract "Mie scattering theory is used to calculate radiation forces on a dielectric microsphere illuminated by evanescent waves, produced by laser light transmitted obliquely through a flat horizontal dielectric surface. The incident field is identified with the evanescent field, and both $p$ and $s$ polarizations are considered. Our investigation consists of three parts. First, after highlighting the basic formalism, we report results for the radiation force published in an earlier paper [J. Opt. Soc. Am. B 12, 2429 (1995)], correcting a few trivial calculational errors. Second---the main objective of our paper---is to show how the vertical (lifting) force on microspheres, typically via a proper adjustment of the laser frequency, can be used to separate spheres differing by a slight amount in their refractive index. This is caused by an oscillatory behavior in the force with respect to the nondimensional wave number $ensuremath{alpha}$ in the surrounding medium. Fine tuning the wave number $ensuremath{alpha}$, relative to the given refractive indices in the system, may lead to particle expulsion. The sorting mechanism turns out to be feasible when $ensuremath{alpha}$ is about 18--20 or larger, which actually is in the region of practical interest. Finally, we investigate how variations in the angle of incidence ${ensuremath{theta}}_{1}$ for the laser beam influences the resulting radiation force." @default.
- W2072682990 created "2016-06-24" @default.
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- W2072682990 date "2013-06-17" @default.
- W2072682990 modified "2023-10-17" @default.
- W2072682990 title "Possible sorting mechanism for microparticles in an evanescent field" @default.
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- W2072682990 doi "https://doi.org/10.1103/physreva.87.063826" @default.
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