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Physical review. B, Condensed matter

Optical multistability in nonlinear superlattices with very thin layers

V.M. Agranovich, С. А. Киселев, D. L. Mills

Published Nov 15, 1991• 37 citations
Publisher

Abstract

We consider the theory of transmission of electromagnetic radiation through a superlattice of finite length, in which the size of the unit cell is small compared to an optical wavelength. One film in each unit cell is assumed to exhibit an optical nonlinearity of Kerr form. We show that a slow spatial modulation of the thickness of the layers leads to a structure with a low threshold for optical bistability.

DOI
10.1103/physrevb.44.10917

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Physical review. B, Condensed matter•Feb 15, 1989•41 citations
We consider the theory of transmission of electromagnetic radiation through a superlattice of finite length, in which the size of the unit cell is small compared to an optical wavelength. One film in each unit cell is assumed to exhibit an optical nonlinearity of Kerr form. We show that a slow spatial modulation of the thickness of the layers leads to a structure with a low threshold for optical bistability.
It is shown that, when two coherent waves are obliquely incident to a one-dimensional nonlinear optical superlattice containing Kerr-form dielectric nonlinearity, an incident-dependent two-dimensional nonlinear optical superlattice can be constructed. This structure can be bistable. There exist two types of optical bistable mechanism, i.e., the index-modulation mechanism and distributed feedback mechanism. Owing to the index-modulation mechanism, the threshold for the bistability is lower than that of a more traditional one-dimensional distributed feedback structure.
We present an analysis of the steady state optical response of two-dimensional optical superlattices with Kerr nonlinearity. We consider the effects of the modification of the refractive index modulation strengths in the superlattices and the angular deviation of incoming radiation from Bragg conditions. We find that under Bragg incidence the system displays optical bistability only when the modulation ratio exceeds a certain threshold. We also predict that optical bistability can disappear under non-Bragg incidence. Physical considerations are presented and discussed on how to optimize the chances for observing optical bistability in such a superlattice.