Results 31 to 40 of about 8,681 (211)
Investigation of Quadrate Fresnel Zone Plates Fabricated by Femtosecond Laser Direct Writing
Applied Sciences, 2022 The circular Fresnel zone plate (FZP) has been extensively used in micro-optics due to its outstanding focusing performance. Despite that, the curved edge of the circular zone has drawbacks limiting its use in terahertz imaging, array generator, and ...
Xiaoyan Sun +3 more
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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
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MRI Compatible Planar Material Acoustic Lenses
Applied Sciences, 2018 Zone plate lenses are used in many areas of physics where planar geometry is advantageous in comparison with conventional curved lenses. There are several types of zone plate lenses, such as the well-known Fresnel zone plates (FZPs) or the more recent ...
Daniel Tarrazó-Serrano +4 more
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IET Image Processing, 2021 A novel asymmetric double image encryption technique is introduced to protect the algorithm from the interlopers by using hybrid chaotic structured phase masks in Arnold and Fresnel transforms.
Shivani Yadav, Hukum Singh
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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
Acoustoelectric conversion and deep-subwavelength acoustic focusing based on Fresnel zone plates
AIP Advances, 2023 Fresnel zone plates (FZP) with quasi-planar structure and ultrathin thickness are capable of focusing light or acoustic waves efficiently. In this paper, we employ the FZP to manipulate the wave fields and suggest two acoustic functionalities.
Xue-ying Gao +4 more
doaj +1 more source
Fresnel zone plate telescopes for X-ray imaging II: numerical simulations with parallel and diverging beams [PDF]
, 2009 We present the results of simulations of shadows cast by a zone plate telescope which may have one to four pairs of zone plates. From the shadows we reconstruct the images under various circumstances.
A. R. Rao +11 more
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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
Flexible Plenoptic X-ray Microscopy
Photonics, 2022 X-ray computed tomography (CT) is an invaluable technique for generating three-dimensional (3D) images of inert or living specimens. X-ray CT is used in many scientific, industrial, and societal fields.
Elena Longo +13 more
doaj +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