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10 April 2007 Optical bistability of the nanoparticle surrounded by resonant atoms
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Absorption of light by nanoparticle in the presence of resonant atom is theoretically investigated. Both the direct absorption of light by the nanoparticle and the absorption due to cascade energy transfer from light to the atom and then to the nanoparticle are taken into account. It is shown, that the cascade energy transfer is proportional to the imaginary part of the Green's photon function in this conditions. The Green's function is calculated in the quasi static approximation because of smallness both the size of the nanoparticle and the distance between it and the atom. The resonant atom is described in the generalized two-level model taking into account the direction of the atomic dipole moment. It is shown, that the light absorption by the nanoparticle can be increased by several orders because of presence of the atom. In the case when the nanoparticle is surrounded by collection of atoms it is found that the optical bistability is possible in this system. The range of parameters leading to the bistable behavior is found.
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Gennady N. Nikolaev "Optical bistability of the nanoparticle surrounded by resonant atoms", Proc. SPIE 6613, Laser Optics 2006: Wavefront Transformation and Laser Beam Control, 66130K (10 April 2007);

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