Results 51 to 60 of about 99,715 (244)
High resolution imaging with Fresnel interferometric arrays: suitability for exoplanet detection [PDF]
, 2005 We propose a new kind of interferometric array that yields images of high dynamic range and large field. The numerous individual apertures in this array form a pattern related to a Fresnel zone plate. This array can be used for astrophysical imaging over
Aime +10 more
core +1 more source
Sensors, 2019 This paper presents a soft engine which performs up-and-down motion with four planar film-structured ionic polymer—metal composites (IPMC) actuators. This soft engine assembled with a stretchable Fresnel zone plate is capable of tuning the focus of
Guo-Hua Feng, Hong-Yu Liu
doaj +1 more source
Lacunar fractal photon sieves [PDF]
, 2007 We present a new family of diffractive lenses whose structure is based on the combination of two concepts: photon sieve and fractal zone plates with variable lacunarity. The focusing properties of different members of this family are examined.
Andersen +18 more
core +2 more sources
Rough Fresnel zone plates over metallic surfaces [PDF]
Applied Optics, 2010 We analyze the focusing properties of Fresnel zone plates fabricated over steel tapes using laser ablation. Our intention is to implement the use of micro-optical elements when the use of conventional chrome-glass elements is not indicated. Because of the manufacture process, the surface presents a certain anisotropic roughness, which reduces the ...
Salgado Remacha, Francisco Javier +3 more
openaire +4 more sources
Refracting profiles and generalized holodiagrams [PDF]
, 2007 The recently developed concept of refracting profiles and that of refraction holodiagrams are combined so that the classical Abramson holodiagrams can be generalized taking into account a wider class of wave fronts and refraction at an interface ...
Abramson +19 more
core +2 more sources
A MEMS-Controllable Fresnel Zone Plate for Miniaturized UV Spectrometer
Proceedings, 2017 This work presents the design and simulation of a MEMS-controllable linear motion Fresnel Zone Plate (FZP). The focal length of an FZP is a function of incident wavelength.
Elnaz Afsharipour +2 more
doaj +1 more source
Nonlinear fresnel zone plate reflector [PDF]
2016 IEEE International Symposium on Antennas and Propagation (APSURSI), 2016 This paper describes a nonlinear Fresnel zone plate reflector designed to operate at 2.8GHz. The alternating Fresnel zones of the reflector are made from two different nonlinear metamaterials: one that reflects like a short circuit at low incident power levels and another that reflects like an open circuit.
openaire +1 more source
An ellipsoidal mirror for focusing neutral atomic and molecular beams [PDF]
, 2004 Manipulation of atomic and molecular beams is essential to atom optics applications including atom lasers, atom lithography, atom interferometry and neutral atom microscopy.
K Fladischer +30 more
core +1 more source
Diffractive X-ray Telescopes [PDF]
, 2010 Diffractive X-ray telescopes using zone plates, phase Fresnel lenses, or related optical elements have the potential to provide astronomers with true imaging capability with resolution several orders of magnitude better than available in any other ...
Skinner, Gerald K.
core +3 more sources
Enhanced imaging with binary circular Dammann Fresnel zone plate.
Optics ExpressWe introduce a novel approach in optical engineering by combining Dammann gratings with binary Fresnel zone plates to create a unique hybrid optical element with enhanced energetic efficiency of its focal spots.
Stefan R. Anton +4 more
semanticscholar +1 more source