A planar slab of negative-index material works as a superlens with sub-diffraction-limited resolution, as propagating waves are focused and, moreover, evanescent waves are reconstructed in the image plane. Here we demonstrate a superlens for electric evanescent fields with low losses using perovskites in the mid-infrared regime. The combination of near-field microscopy with a tunable free-elect...

We report on a simple and accurate method for determination of thermo-optical and spectroscopic parameters (thermal diffusivity, temperature coefficient of the optical path length change, pump and fluorescence quantum efficiencies, thermal loading, thermal lens focal length, etc) of relevance in the thermal lensing of end-pumped neodymium lasers operating at 1.06- and 1.3- microm channels. The ...

Diffraction limits standard optical microscopy to a spatial resolution of about half the wavelength of light. We present novel microscopy techniques for imaging semiconductor materials and devices at better than diffraction-limited spatial resolution and observe previously inaccessible phenomena. We discuss the methods and results for Numerical Aperture Increasing Lens (NAIL) and Near-field Sca...

The lens from a patient with homocystinuria was examined by scanning and transmission electron microscopy. A fringe of zonular remnants was found attached to the anterior lens capsule, and was observed to be composed of masses of short filaments in disarray, together with occasional bundles of normal-appearing zonular filaments. Although a pericapsular membrane (zonular lamella) was not observe...

We discuss the design and performance of a miniature objective lens optimized for coherent Raman scattering microscopy. The packaged lens assembly has a numerical aperture of 0.51 in water and an outer diameter of 8 mm. The lens system exhibits minimum chromatic aberrations, and produces coherent Raman scattering images with sub-micrometer lateral resolution (0.648 μm) using near-infrared excit...

in view of the rapid expansion of contact lens amongst the users, new dimensions have been added to the domain of ophthalmology: giant papillay conjunctivitis, a disease caused by different kinds of contact lens, appears weeks or months after they are used, although some patients are struck years later. the predominant symptoms are increased awareness of lenses, ocular itching, blurred vision a...

A case of severe endophthalmitis after cataract extraction followed by posterior chamber lens implantation is reported. Microbiological cultures from a tap of the patient's aqueous humour prior to lens explantation as well as from the explanted lens and aqueous and vitreous humour during operation yielded Staphylococcus epidermidis sensu stricto. Scanning electron microscopy showed massive colo...

The eye lens consists of a layer of epithelial cells that overlay a series of differentiating fiber cells that upon maturation lose their mitochondria, nuclei and other organelles. Lens transparency relies on the metabolic function of mitochondria contained in the lens epithelial cells and in the immature fiber cells and the programmed degradation of mitochondria and other organelles occurring ...

We wish to report the first experimental demonstration of two-photon “ghost” imaging with a pseudo-thermal source. Similarly to the case of entangled states, a two-photon Gaussian thin lens equation is observed. We introduce the concepts of “two-photon coherent” and “two-photon incoherent” imaging. The differences between the entangled and the thermal cases are explained in terms of these conce...

Locating atoms with higher precision Two major problems that limit the resolution and interpretation of electron microscopy images are lens aberrations multiple scattering. Chen et al. overcame these issues ptychography, a technique uses coherent scattering overlapping illumination spots to reconstruct an image from far-field diffraction patterns. This method works at is limited, not by optics,...