Volume 88, Issue 1, 01 July 2000
Index of content:
- LASERS, OPTICS, AND OPTOELECTRONICS (PACS 42)
88(2000); http://dx.doi.org/10.1063/1.373615View Description Hide Description
A succession of directional couplers, which differ only through their refractive index distribution, is shown to be the optical analog of type II semiconductorheterostructures. 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.
88(2000); http://dx.doi.org/10.1063/1.373616View Description Hide Description
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.
88(2000); http://dx.doi.org/10.1063/1.373617View Description Hide Description
In this article, I describe a method for inverting diffusive photon density images of objects immersed in a turbid medium. A theoretical model for photondiffusion 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.