Light scattering

About: Light scattering is a research topic. Over the lifetime, 37721 publications have been published within this topic receiving 861581 citations.

Rayleigh scattering

Abstract: By using a computer program, the authors intend to compute quantities specifying the low frequency scattering behavior of rotationally symmetric bodies which are metallic (electromagnetic scattering), soft, or hard (acoustic scattering)

Light scattering studies of molecular liquids

Abstract: In this review we focus attention primarily upon the depolarized Rayleigh and Raman scattering from liquids composed of small, rigid molecules; however, we also refer to the results of other experiments (NMR, IR, and molecular dynamics) that provide complementary infor­ mation. Even within this limited framework we do not provide a comprehensive review of the recent literature but rather we select certain topics that are of particular interest to us and where important changes have recently occurred. We have attempted to integrate the information from different sources and to provide a critical (and clearly personalized) analysis. Several excellent reviews of various aspects of this subject have appeared since the last review in this series (1). In particular the text on light scattering by Berne & Pecora (2), reviews on vibrational dephasing and energy relaxation by Oxtoby (3,4), the articles on rotational relaxation by Steele (5) and Griffiths (6), and the review of collision-induced scattering by Tabisz (7) discuss the techniques and physical principles involved. The up-to-date treatment of many topics in these sources has helped us restrict our choice of subject matter. The Raman and depolarized Rayleigh spectra monitor the fluctua­ tions in the polarizability density that arise from the modulation of the intrinsic (gas phase) and the interaction-induced polarizabilities of the molecules by the molecular motion. If there were no interaction-induced polarizability the shape of the depolarized Rayleigh spectrum (DRS)

Liquid crystalline light modulating device & material.

Abstract: A new liquid crystalline light modulating cell and material are characterized by liquid crystalline light modulating material of liquid crystal and polymer, the liquid crystal being a chiral nematic liquid crystal (16) having positive dielectric anisotropy and including chiral material in an amount effective to form focal conic and twisted planar textures, the polymer being distributed in phase separated domains (15) in the liquid crystal cell in an amount that stabilizes the focal conic and twisted planar textures in the absence of a field and permits the liquid crystal to change textures upon the application of a field. In one embodiment, the material is light scattering in a field-OFF condition and optically clear in a field-ON condition, while in another embodiment, the material is optically clear in a field-OFF condition and light scattering in a field-ON condition. In still another embodiment, the material exhibits stability at zero field in a colored, light reflecting state, a light scattering state and multiple stable reflecting state therebetween, as well as being optically clear in the presence of a field.

Light scattering from human hair fibers

Abstract: Light scattering from hair is normally simulated in computer graphics using Kajiya and Kay's classic phenomenological model. We have made new measurements of scattering from individual hair fibers that exhibit visually significant effects not predicted by Kajiya and Kay's model. Our measurements go beyond previous hair measurements by examining out-of-plane scattering, and together with this previous work they show a multiple specular highlight and variation in scattering with rotation about the fiber axis. We explain the sources of these effects using a model of a hair fiber as a transparent elliptical cylinder with an absorbing interior and a surface covered with tilted scales. Based on an analytical scattering function for a circular cylinder, we propose a practical shading model for hair that qualitatively matches the scattering behavior shown in the measurements. In a comparison between a photograph and rendered images, we demonstrate the new model's ability to match the appearance of real hair.