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Physical Review Letters

Stark-enhanced phase conjugation in shaped-microparticle suspensions

Daniel N. Rogovin

Published Jul 30, 1990• 5 citations
Publisher

Abstract

We examine optical phase conjugation for a shaped-microparticle suspension maintained in a uniform electric field. Theory asserts that the presence of a Stark field decreases the grating response time and enhances the composite's four-wave-mixing coefficient. These changes arise from and reflect the narrow angular range in which the particles are constrained to point, giving rise to reduced rotational times and the appearance of a new coherent scattering mechanism.

DOI
10.1103/physrevlett.65.567

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We examine optical phase conjugation for a shaped-microparticle suspension maintained in a uniform electric field. Theory asserts that the presence of a Stark field decreases the grating response time and enhances the composite's four-wave-mixing coefficient. These changes arise from and reflect the narrow angular range in which the particles are constrained to point, giving rise to reduced rotational times and the appearance of a new coherent scattering mechanism.
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We examine phase conjugation via degenerate four-wave mixing in liquid suspensions of microellipsoids in the small-field limit, where saturation effects can be ignored. For these media, electro- strictive torques rotate the microellipsoids in such a way that two orthogonal orientational gratings are created. Furthermore, electrostrictive forces modulate the microparticle density, which gives rise to the formation of two orthogonal spatial gratings that are superimposed on the orientational ones. Coherent scattering of pump radiation from these four gratings generates the conjugate wave and, in the low-loss limit, amplifies the probe wave. We discuss the steady-state and transient characteristics of the probe and conjugate waves in this limit where microparticle dynamics are governed by diffusion.
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