Light scattering

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

Light Scattering by Coherently Driven Lattice Vibrations

Abstract: Observations of Raman scattering from intense coherently driven lattice vibrations in calcite are reported. The lattice vibrations ($\overline{\ensuremath{ u}}({A}_{1})=1086$ ${\mathrm{cm}}^{\ensuremath{-}1}$) are produced by the stimulated Raman effect, and the scattering is observed with low-intensity monochromatic probe sources in the red and ultraviolet. The Raman-scattered light is found to be (1) linear in the probe intensity, (2) monochromatic, (3) highly efficient (\ensuremath{\sim}3%), (4) approximately equally intense in the Stokes and anti-Stokes, and (5) emitted at angles in agreement with phase-matching conditions. A coupled-wave theory of the scattering is found to account quantitatively for most of the observations. Possible applications for the technique are suggested.

Vector Scattering Theory

Abstract: Vector theories dealing with the interaction of light with surface roughness are reviewed. Light scattering from microirregularities whose heights are much smaller and much larger than the wavelength of the incident light are discussed. The theories apply to metal-coated surfaces and, in addition, surfaces covered with multilayer dielectric stacks. Surface plasmon effects, which are also discussed, include the decrease in the specular reflectance caused by conversion of photon energy into surface plasmons (i.e., additional absorption due to surface plasmons), as well as the radiative decay of surface plasmons into photons (i.e., surface plasmon "scattering"). There is a brief discussion of how to use experimental surface height data in the theoretical formulae. Finally, published experimental data on scattering and surface plasmon effects are compared to theoretical predictions.

Single scattering properties of droxtals

Abstract: Small ice crystals have been found to occur in high concentrations in polar stratospheric clouds and the upper portion of cirrus clouds, where temperatures are extremely low (often less than −50°C). The scattering properties of these small crystals are important to space-borne remote sensing, especially for the retrieval of cirrus properties using visible and near-infrared channels. Previous research has shown that the commonly used spherical and “quasi-spherical” approximations for these ice crystals can lead to significant errors in light scattering and radiative transfer calculations. We suggest that droxtals more accurately represent the shape of these small ice crystals. The single-scattering properties of ice droxtals have been computed at visible and infrared wavelengths using the finite-difference time domain method for size parameters smaller than 20. Further study of the optical properties of larger droxtals (size parameter greater than 20) will be carried out using an improved geometric optics method.

Equilibrium sedimentation profiles of screened charged colloids: A test of the hard-sphere equation of state.

Abstract: Suspensions of model colloidal particles represent, besides their intrinsic interest,a very important system for the study of basic properties of liquids because they show length scales accessible to optical scattering techniques, and interparticle potentials simple enough to allow quantitative tests of liquid state theories [1]. The usual experimental approach is that of deriving the static structure factor from scattering experiments. However, it is known that the measurement of the equation of state would constitute a more stringent test of the properties of the system, because of the greater sensitivity to the details of the interparticle interaction potential [2]. It has been noted [3–5] that a single measurement of the particle density profile of a colloidal suspension at sedimentation equilibrium under the gravitational field can directly yield the osmotic equation of state of the suspension, but sufficiently accurate data are not available, except for measurements of the osmotic pressure at melting in settling suspensions of polystyrene particles by Hachisu and Takano [4] and for the study of order-disorder transitions in suspensions of colloidal silica performed by Davis et al. [6]. It is very difficult to find an accurate probe of the local particle density over a wide range of volume fractions by using standard colloidal suspensions. Indeed, conventional polarized light scattering gives results which depend also on interparticle interactions.

Electroluminescent device having improved light output

Abstract: An electroluminescent device including a transparent substrate, a securing layer, a light scattering layer, an electroluminescent unit including a transparent electrode layer, a light emitting element including at least one light emitting layer, and a reflecting electrode layer in that order, wherein the light scattering layer includes one monolayer of inorganic particles having an index of refraction larger than that of the light emitting layer and wherein the securing layer holds the inorganic particles in the light scattering layer.