Results 11 to 20 of about 5,613 (231)
A Novel Deep Unfolding Network for Multi-Band SAR Sparse Imaging and Autofocusing [PDF]
Remote SensingThe sparse imaging network of synthetic aperture radar (SAR) is usually designed end to end and has a limited adaptability to radar systems of different bands.
Xiaopeng Li +5 more
doaj +2 more sources
Varifocal Meta-Lens for Multifunctional Focusing and Imaging. [PDF]
Adv Sci (Weinh)A varifocal meta‐lens enables dynamic switching between conventional focusing and non‐diffracting autofocusing beams, relying on a phase design with dual interpretations in both real space and the spatial frequency domain. By integrating a Moiré‐based tuning mechanism, the system achieves continuous focal length control in both modes.
Lin R +6 more
europepmc +2 more sources
Water-Immersed GaP Huygens' Meta-Optics for Visible Structured Light Generation. [PDF]
Adv Sci (Weinh)Ultrathin GaP Huygens’ metasurfaces operating in the visible regime generate structured light beams underwater, including focusing Gaussian beams, abruptly autofocusing beams, Bessel beams, and optical vortices. The platform offers enhanced fabrication tolerance and mechanical stability, establishing a robust route toward compact underwater ...
Lee JH +8 more
europepmc +2 more sources
Abrupt autofocusing performance of a circular Airyprime beam with vortex pairs
Results in Physics, 2023 Abrupt autofocusing performance of a circular Airyprime beam (CAPB) with vortex pairs propagating in free space is investigated. Here the vortex pairs are off-axis by default.
Wen-Song Dan +6 more
doaj +1 more source
Robust autofocusing in microscopy [PDF]
Cytometry, 2000 A critical step in automatic microscopy is focusing. This report describes a robust and fast autofocus approach useful for a wide range of microscopic modalities and preparations.The focus curve is measured over the complete focal range, reducing the chance that the best focus position is determined by dust or optical artifacts.
Geusebroek, J.M. +3 more
openaire +5 more sources
Changing the trajectory of Airy beam sets with spatial carriers
Компьютерная оптика, 2022 In this paper, we study a change in the propagation trajectory of a set of autofocusing laser beams using a fractional Fourier transform. Clusters of displaced bounded Airy-Gaussian beams supplemented by a phase function that deflects the beam similarly ...
A.O. Frolov, А.V. Ustinov, S.N. Khonina
doaj +1 more source
Virtual Staining of Defocused Autofluorescence Images of Unlabeled Tissue Using Deep Neural Networks
Intelligent Computing, 2022 Deep learning-based virtual staining was developed to introduce image contrast to label-free tissue sections, digitally matching the histological staining, which is time-consuming, labor-intensive, and destructive to tissue.
Yijie Zhang +7 more
doaj +1 more source
SPA-GAN: SAR Parametric Autofocusing Method with Generative Adversarial Network
Remote Sensing, 2022 Traditional synthetic aperture radar (SAR) autofocusing methods are based on the point-scattering model, which assumes the scattering phases of a target to be a constant.
Zegang Ding +6 more
doaj +1 more source
Journal of Information and Intelligence, 2023 This paper proposes a new method to generate a two-dimensional (2D) Airy beam and Airy autofocusing beam by using the scalar holographic metasurface with amplitude-phase modulation in the microwave band.
Song Zhang +6 more
doaj +1 more source
Frontiers in Neuroscience, 2021 ObjectiveMagnetic resonance-guided focused ultrasound surgery (MRgFUS) lesioning is a new treatment for brain disorders. However, the skull is a major barrier of ultrasound sonication in MRgFUS because it has an irregular surface and varies its size and ...
Kyung Won Chang +6 more
doaj +1 more source