Results 11 to 20 of about 178,783 (273)
Engineering phase and polarization singularity sheets [PDF]
Nature Communications, 2021 Metasurfaces allow for vast possibilities of light control. Here, the authors demonstrate on-demand engineering and realization of a broad family of two-dimensional phase singularity sheets and transverse polarization singularity sheets, opening up new ...
Soon Wei Daniel Lim +4 more
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Singular Electromagnetics: From Phase Singularities to Optical Skyrmions and Beyond
Advanced Physics ResearchSingular electromagnetics, also known as singular optics in the visible spectrum, is a branch of modern electromagnetics/optics that studies the solutions with nontrivial topological features to Maxwell's equations under different boundary conditions ...
Jie Yang +3 more
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Phase Singularities to Polarization Singularities [PDF]
International Journal of Optics, 2020 Polarization singularities are superpositions of orbital angular momentum (OAM) states in orthogonal circular polarization basis. The intrinsic OAM of light beams arises due to the helical wavefronts of phase singularities. In phase singularities, circulating phase gradients and, in polarization singularities, circulating ϕ12 Stokes phase gradients are
null Ruchi +2 more
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Phase singularity diffusion [PDF]
Optics Letters, 2014 We follow the trajectories of phase singularities at nulls of intensity in the speckle pattern of waves transmitted through random media as the frequency of the incident radiation is scanned in microwave experiments and numerical simulations. Phase singularities are observed to diffuse with a linear increase of the square displacement with frequency ...
Cheng, Xiaojun +2 more
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Deep-learning-based recognition of multi-singularity structured light
Nanophotonics, 2021 Structured light with customized topological patterns inspires diverse classical and quantum investigations underpinned by accurate detection techniques.
Wang Hao +10 more
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Rotor Localization and Phase Mapping of Cardiac Excitation Waves Using Deep Neural Networks
Frontiers in Physiology, 2021 The analysis of electrical impulse phenomena in cardiac muscle tissue is important for the diagnosis of heart rhythm disorders and other cardiac pathophysiology. Cardiac mapping techniques acquire local temporal measurements and combine them to visualize
Jan Lebert +4 more
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Singularities and gauge theory phases [PDF]
Advances in Theoretical and Mathematical Physics, 2015 Motivated by M-theory compactification on elliptic Calabi-Yau threefolds, we present a correspondence between networks of small resolutions for singular elliptic fibrations and Coulomb branches of five-dimensional N=1 gauge theories. While resolutions correspond to subchambers of the Coulomb branch, partial resolutions correspond to higher codimension ...
Esole, Mboyo +2 more
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Spiral phase plate with multiple singularity centers
Компьютерная оптика, 2020 We investigate a multispiral phase plate (MSPP) with multiple centers of phase singularity arbitrarily located in the MSPP plane. Equations to describe the topological charge of an optical vortex in the initial plane immediately behind the MSPP and ...
V.V. Kotlyar +3 more
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Anisotropic singular double phase Dirichlet problems
Discrete & Continuous Dynamical Systems - S, 2021 <p style='text-indent:20px;'>We consider an anisotropic double phase problem with a reaction in which we have the competing effects of a parametric singular term and a superlinear perturbation. We prove a bifurcation-type result describing the changes in the set of positive solutions as the parameter varies on <inline-formula><tex-math ...
Papageorgiou, Nikolaos S. +2 more
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Journal of Arrhythmia, 2021 Background Atrial fibrillation (AF) is characterized by the repetitive regeneration of unstable rotational events, the pivot of which are known as phase singularities (PSs).
Madeline Schopp +9 more
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