Indium phosphide is one of the most promising materials for photonic integrated circuits that combine passive optical components such as waveguides, couplers, and filters with active components such as lasers, detectors, and modulators all on the same chip. A waveguide lens is a very useful component for integrated optics and substantial work has indeed been devoted to its achievement. Many len...

OBJECTIVE To develop and evaluate new thin and light glasses for the examination of patients with nystagmus and to compare them with Frenzel goggles. METHODS First, we designed new examination glasses: a Fresnel-based device with a short focal length that is not as heavy or bulky as Frenzel goggles. Second, visual-fixation suppression of postrotatory nystagmus with Frenzel goggles and the Fre...

Chalcogenide glasses have attracted growing interest for their potential to meet the demands of photonic applications in Mid-Wavelength InfraRed (MWIR) and Long-Wavelength (LWIR) transmission windows. In this work, we investigated photosensitivity femtosecond laser irradiation a dedicated chalcogenide glass, along with its possible micro-optics. order address SWaP problem (Size, Weight Power), ...

We compare the Fresnel diffraction pattern of a thin circular disk with that of a square obstacle, specifically evaluating the on-axis field strength. Photographs of the diffraction patterns reveal some curious features for the square obstacle. Second, the precise electric and magnetic fields behind a conducting circular disk are evaluated without invoking the Fresnel approximation and contrast...

2014 The paper describes the principles and theoretical models of new X-ray optical elements based on the behaviour of Bragg-Fresnel diffraction. The use of volume diffraction permits one to achieve better spatial resolution compared with conventional plane optics and bending mirrors. The construction of Bragg-Fresnel elements combines the advantages of high-resolution Fresnel optics with stabi...

The Fresnel lens is an optical system consisting of a series concentric diamond grooves. One surface the smooth, while other engraved with circles increasing size. Optical interference, diffraction, and sensitivity to angle incidence are used design microstructure on surface. imaging depends its curvature. By reducing thickness lens, light can still be focused at same focal point as thicker len...

introduction: among the components of the extracellular matrix (ecm) and basement membrane (bm), laminitis heterotrimeric glycoprotein (laminin) and collagen type iv are the most important. in a previous study we have examined the role of collagen type iv in the developing lens capsule. the present study aims to determine the appearance and distribution of laminin in the bm and ecm of lenses du...

Device-free localization plays an important role in many ubiquitous applications. Among the different technologies proposed, Wi-Fi based technology using commercial devices has attracted much attention due to its low cost, ease of deployment, and high potential for accurate localization. Existing solutions use either fingerprints that require labor-intensive radio-map survey and updates, or mod...

Focusing Fresnel lenses are used in many fields of applied optics. These devices optical sensor systems for imaging and optoelectronic integration. The traditional lens concentrates the light intensity on center formed image. We present a microprismatic that transforms circular incident parallel beam into homogeneous circle with necessary diameter at certain distance from lens. transforming con...