Linking Diffractive and Geometrical Optics Surface Scattering at a Fundamental Level

Riemannian Geometrical Optics: Surface Waves in Diffractive Scattering

The geometrical diffraction theory, in the sense of Keller, is here reconsidered as an obstacle problem in the Riemannian geometry. The first result is the proof of the existence and the analysis of the main properties of the diffracted rays, which follow from the non-uniqueness of the Cauchy problem for geodesics in a Riemannian manifold with boundary. Then, the axial caustic is here regarded ...

Diffractive Scattering at Hera

Recent measurements of diiractive deep-inelastic scattering at HERA are described. The eeective pomeron describing the energy dependence of the ? p interaction has intercept IP (0) larger than that governing soft hadronic interactions. When a partonic structure is ascribed to the pomeron, QCD analysis of the diiractive cross section reveals that 80 ? 90% of the exchanged momentum is carried by ...

Controlled Scattering of Light Waves: Optimal Design of Diffractive Optics

optics of diffractive multifocal iol

the diffractive multifocal iol provides simultaneous bifocal imaging by utilizing both diffractive and refractive optics. in both distant and near vision, there is a clear highly focused image on the retina. the second image is highly defocused, providing only faint background illumination. a small amount of the light goes to the higher orders of diffraction which are not perceptible by eyes. t...

Geometrical-optics solution to light scattering by droxtal ice crystals.

We investigate the phase matrices of droxtals at wavelengths of 0.66 and 11 microm by using an improved geometrical-optics method. An efficient method is developed to specify the incident rays and the corresponding impinging points on the particle surface necessary to initialize the ray-tracing computations. At the 0.66-microm wavelength, the optical properties of droxtals are different from th...