Results 31 to 40 of about 1,347 (193)
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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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
doaj +1 more source
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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Simulation of Fresnel Zone Plate Imaging Performance with Number of Zones [PDF]
Sensors, 2020 In recent years, integral imaging, a promising three-dimensional imaging technology, has attracted more and more attention for its broad applications in robotics, computational vision, and medical diagnostics. In the visible spectrum, an integral imaging system can be easily implemented by inserting a micro-lens array between a image formation optic ...
Li, Ying +2 more
openaire +4 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
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
Fresnel zone plates as neutron optical elements for neutron imaging [PDF]
, 2004 We present the operation of a matrix of Fresnel zone plates consisting of 900 individual zone plates. The individual efficiency of the zone plate lenses is close to 30% for lambda = 13.7 angstrom. We discuss the use of such a matrix as an optical element
SACCHETTI, Francesco +5 more
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Moiré pattern of two fresnel zone plates [PDF]
, 2011 Waves theoryThe Moiré pattern formed using two displaced Fresnel zone plates illustrates the straight line interference fringes produced by interfering two spherical waves having the same radius of curvature.
Wyant, James C.
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Rough Fresnel zone plates over metallic surfaces [PDF]
, 2010 © 2010 Optical Society of America. The authors are grateful to Francisco José Torcal Milla for his help. This work has been partially supported by project CCG08-UCM/DPI-3952 of Dirección General de Universidades e Investigación de la Consejería de ...
Bernabeu Martínez, Eusebio +3 more
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Moiré pattern of two fresnel zone plates [PDF]
, 2016 Waves theoryThe Moiré pattern formed using two displaced Fresnel zone plates illustrates the straight line interference fringes produced by interfering two spherical waves having the same radius of curvature.
Wyant, James C.
core +2 more sources