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Optical bistability in nonlinear composites with coated ellipsoidal nanoparticles

Anatoliy Pinchuk1

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Nonlinear composite structures show great promise for use in optical switching, signal processing, etc. We derive an effective nonlinear dielectric permittivity of composite structures where coated ellipsoidal nonlinear particles are imbedded in a linear host medium. The derived expression for the effective dielectric permittivity tensor follows the Clasius–Mossotti approximation. We observe conditions for the existence of the optical bistability effect in a coated ellipsoidal particle with a nonlinear core and a metallic shell. Our numerical results show stronger bistability effects in more dense suspensions of nonlinear heterogeneous ellipsoids.


PACS

42.65.Pc Optical bistability, multistability, and switching, including local field effects

42.79.Sz Optical communication systems, multiplexers, and demultiplexers

78.67.Bf Nanocrystals and nanoparticles

Subjects

Optics, quantum optics and lasers

Nanoscale science and low-D systems

Dates

Issue 5 (7 March 2003)

Received 3 October 2002

Published 14 February 2003



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