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1 Jul 2000

Volume 88, Issue 1, pp. 1-602

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Optical analogue of a type II semiconductor heterostructure

D. Dragoman

J. Appl. Phys. 88, 1 (2000); http://dx.doi.org/10.1063/1.373615 (6 pages) | Cited 22 times

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A succession of directional couplers, which differ only through their refractive index distribution, is shown to be the optical analog of type II semiconductor heterostructures. The design of such a dielectric structure with the same transmission characteristic of the electric field propagating through it as the electron wave function in a type II heterostructure is discussed. An example of the design procedure is also given. © 2000 American Institute of Physics.
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42.82.Et Waveguides, couplers, and arrays
42.79.Gn Optical waveguides and couplers
78.66.Nk Insulators

Optical nonlinearity of water in oil microemulsion near percolation

L. Vicari

J. Appl. Phys. 88, 7 (2000); http://dx.doi.org/10.1063/1.373616 (4 pages) | Cited 1 time

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Anomalous strong nonlinear optical behavior of a heterogeneous two-component system is experimentally demonstrated and briefly discussed. The material is a three component microemulsion of water microspheres coated by a monomolecular layer of sodium-bis-di-ethylsulfosuccinate (AOT) immersed in an aliphatic oil (Decane): the three-component Water/AOT/Decane. Traditional nonlinear optics mechanisms, like thermal blooming, thermal diffusion, and electrostriction are shown to be insufficient to account for this nonlinearity. Both its amount and its dynamic require the consideration of a new effect. We retain anisotropic cluster formation and consequent rotational and diffusive dynamic as the main reasons for the new phenomenon. © 2000 American Institute of Physics.
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42.65.-k Nonlinear optics
82.70.Kj Emulsions and suspensions

Application of an inverse scattering technique to diffusive photon density images

Xiaoyan Han

J. Appl. Phys. 88, 11 (2000); http://dx.doi.org/10.1063/1.373617 (9 pages) | Cited 8 times

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In this article, I describe a method for inverting diffusive photon density images of objects immersed in a turbid medium. A theoretical model for photon diffusion is presented, and an inversion method that uses only a single image, and which is accomplished with only one step, is proposed. The proposed method is applied to images of several objects immersed in milk. The resulting images show greatly increased contrast and resolution over the original uninverted images. © 2000 American Institute of Physics.
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42.30.Va Image forming and processing
42.30.Lr Modulation and optical transfer functions
42.25.Fx Diffraction and scattering
07.05.Pj Image processing
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