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arXiv:quant-ph/0105154 · International Journal of Modern Physics B

COOPERATIVE EFFECTS ON OPTICAL FORCES — DICKE'S BULLET

Padmakar V. Panat, S. V. Lawande

Published Oct 10, 2002• 4 citations
arXivHTMLPDF

Abstract

We investigate the cooperative effects on optical forces in a system of N two level atoms confined to a volume of dimension less than λ3, where λ is radiation wavelength and driven by a coherent radiation field with a spatial profile like Laguerre–Gaussian or ideal Bessel beam. We show a dramatic enhancement on optical forces as well as on the angular momentum imparted to the atom by a factor of N2.

DOI
10.1142/s0217979202013043

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We investigate the cooperative effects on optical forces in a system of N two level atoms confined to a volume of dimension less than λ3, where λ is radiation wavelength and driven by a coherent radiation field with a spatial profile like Laguerre–Gaussian or ideal Bessel beam. We show a dramatic enhancement on optical forces as well as on the angular momentum imparted to the atom by a factor of N2.
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An effect of phase fluctuations of a driving laser field on dissipative and dipolar forces of two-level atom is considered. The phase fluctuations are treated by a phase diffusion model where phase fluctuations follow Wiener–Levy process. An exact master equation for the relevant density operator is obtained and solved in the steady state. Optical forces are calculated. The effect of phase fluctuations on angular momentum imparted by a Laguerre–Gaussian beam and an ideal Bessel beam to the atom is investigated.
We study resonator-induced light forces arising from cooperative atom–light interaction. For such collective processes, the force on the sample can be orders of magnitude larger than the sum of conventional light forces on individual atoms. Since resonator-induced light forces can be dissipative even when the incident light is far detuned from atomic transitions, they may be applicable to target particles with a complex level structure. (Some figures in this article are in colour only in the electronic version)
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