The method of manufacturing and the results studies a lens corrector that converts spherical diverging front into plane one is intended for studying flat surfaces as part an interferometer with diffraction comparison wave described. A feature use aspherical convex surface maximum deviation ~ 200 μm from nearest sphere. first experimental are presented, indicating prospects using ion-beam proces...

The JVAS (Jodrell Bank-VLA Astrometric Survey) and CLASS (Cosmic Lens All-Sky Survey) are well-defined surveys containing about ten thousand flat-spectrum radio sources. For many reasons, flat-spectrum radio sources are particularly well-suited as a population from which one can obtain unbiased samples of gravitational lenses. These are by far the largest gravitational (macro)lens surveys, and ...

marfan syndrome (mfs) is a genetic disorder which is inherited by autosomal dominant traits. in mfs, lens displacement and cardiovascular involvement are important causes of morbidity and mortality in the clinical course of the disease. in this case study, the ocular involvement in a family with severe penetration of mfs is reported. twelve members of a family (father, two daughters, three sons...

Dispersion, impedance matching and resolution characteristics of an isotropic three-dimensional flat lens (“superlens”) are studied. The lens is based on cubic meshes of interconnected transmission lines and bulk loads. We study a practical realization of the lens, based on the microstrip technology. The dispersion equations that have been previously derived, are verified with full-wave simulat...

Surface topography and refractive index profile dictate the deterministic functionality of a lens. The polarity of most lenses reported so far, that is, either positive (convex) or negative (concave), depends on the curvatures of the interfaces. Here we experimentally demonstrate a counter-intuitive dual-polarity flat lens based on helicity-dependent phase discontinuities for circularly polariz...

PURPOSE To examine the optimum time at which fluorescein patterns of gas permeable lenses (GPs) should be evaluated. METHODS Aligned, 0.2mm steep and 0.2mm flat GPs were fitted to 17 patients (aged 20.6 ± 1.1 years, 10 male). Fluorescein was applied to their upper temporal bulbar conjunctiva with a moistened fluorescein strip. Digital slit lamp images (CSO, Italy) at 10× magnification of the ...

Laser directed patterning of carbon nanotubes-based buckypaper for producing a diffractive optical device is presented here. Using a laser ablation method the buckypaper was patterned into a binary Fresnel zone plate lens. Computational modelling was performed which revealed excellent focusing performance of the lens for both visible and THz radiations. SEM and Raman measurements of the lens we...

The imaging of the near field by a slab of negative permittivity medium is discussed. The performance of this flat lens is limited by the working wavenumber k0 and the slab thickness d. For k0d 0.937, the resolution of the flat lens can be smaller than the wavelength and depends logarithmically on 1/k0d. The electric field is finite everywhere, but will diverge algebraically as one reduces k0d ...