Results 11 to 20 of about 5,580 (232)
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
Low-cost whole slide imaging system with single-shot autofocusing based on color-multiplexed illumination and deep learning. [PDF]
Biomed Opt Express, 2021 Xin K +9 more
europepmc +2 more sources
Abruptly autofocusing waves [PDF]
Optics Letters, 2010 We introduce a new class of (2+1)D spatial and (3+1)D spatiotemporal waves that tend to autofocus in an abrupt fashion. While the maximum intensity of such a radial wave remains almost constant during propagation, it suddenly increases by orders of magnitude right before its focal point.
Efremidis, Nikolaos K. +1 more
openaire +5 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