Results 21 to 30 of about 1,516 (173)
Pinhole Zone Plate Lens for Ultrasound Focusing
Sensors, 2017 The focusing capabilities of a pinhole zone plate lens are presented and compared with those of a conventional Fresnel zone plate lens. The focusing properties are examined both experimentally and numerically.
Constanza Rubio +5 more
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High-efficiency focusing and imaging by dielectric kinoform zone plate lenses with soft X-rays
Journal of Synchrotron Radiation, 2023 With fast advances in enhancing the focusing/imaging resolution of Fresnel zone plate lenses toward sub-10 nm, low diffraction efficiency in connection with their rectangular zone shape still remains a big issue in both soft and hard X-ray microscopy. In
Xujie Tong +9 more
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Design of Fresnel Lens-Type Multi-Trapping Acoustic Tweezers
Sensors, 2016 In this paper, acoustic tweezers which use beam forming performed by a Fresnel zone plate are proposed. The performance has been demonstrated by finite element analysis, including the acoustic intensity, acoustic pressure, acoustic potential energy ...
You-Lin Tu +2 more
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Achromatic acoustic generalized phase-reversal zone plates
New Journal of Physics, 2022 We report an achromatic acoustic generalized phase-reversal zone plate by harnessing the response of dipole and monopole, which eliminate the chromatic aberration of conventional zone plates.
Gaokun Yu, Xinyu Zou, Peifeng Wang
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A beam steering antenna based on Fresnel zone plate radome
Electronics Letters, 2021 In this study, a beam steering antenna was presented, comprising patch antenna and two layers of Fresnel zone plate (FZP). One of the FZP was a fixed structure, the other was a 1‐D collapsible radome with alternately deployed metal strips covering and ...
Yuting Wu +3 more
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Journal of Synchrotron Radiation, 2022 An X-ray computed nano-tomography (nano-CT) system has been established at the BL33XU beamline of SPring-8. The optical system consists of pseudo-Köhler illumination with a sector condenser zone plate, an apodization Fresnel zone plate as the objective ...
Satoshi Yamaguchi +8 more
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Resolutions in Imaging with Fresnel Zone Plate
RADIOISOTOPES, 1978 A coarse Fresnel zone plate (FZP) may be used as a large-area coded aperture for imaging incoherent sources. The longitudinal and lateral spatial resolutions are discussed on the basis of experiment using an FZP having 18 or 19 zones as an aperture. In this paper, it is then shown that the lateral spatial resolution is about 5 mm and the longitudinal ...
ITAYA, Gensei, KOJIMA, Kazuhiko
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Terahertz metasurface zone plates with arbitrary polarizations to a fixed polarization conversion
Opto-Electronic Science, 2022 Metasurfaces that can realize the polarization manipulation of electromagnetic waves on the sub-wavelength scale have become an emerging research field. Here, a novel strategy of combining the metasurface and Fresnel zone plate to form a metasurface zone
Zhen Yue +10 more
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Компьютерная оптика, 2022 Using a finite-difference time-domain method, it has been shown that focal spots generated when tightly focusing a linearly polarized Gaussian beam by a Fresnel zone plate (FZP) and when focusing a Gaussian beam with an embedded optical vortex by a ...
A.A. Savelyeva, E.S. Kozlova
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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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