Results 281 to 290 of about 7,348,255 (319)

Generation of phase singularity through diffracting a plane or Gaussian beam by a spiral phase plate

Journal of the Optical Society of America A: Optics and Image Science, and Vision, 2005
VÍCTOR V Kotlyar, Svetlana N Khonina, VÍCTOR A Soifer   +2 more
exaly   +2 more sources

Renewal Theory as a Universal Quantitative Framework to Characterize Phase Singularity Regeneration in Mammalian Cardiac Fibrillation.

Circulation: Arrhythmia and Electrophysiology, 2019
BACKGROUND Despite a century of research, no clear quantitative framework exists to model the fundamental processes responsible for the continuous formation and destruction of phase singularities (PS) in cardiac fibrillation. We hypothesized PS formation/
D. Dharmaprani, M. Schopp, P. Kuklik, D. Chapman, A. Lahiri, L. Dykes, F. Xiong, M. Aguilar, B. Strauss, L. Mitchell, K. Pope, C. Meyer, S. Willems, F. Akar, S. Nattel, A. McGavigan, A. Ganesan   +16 more
semanticscholar   +1 more source

Laser beams with phase singularities

Optical and Quantum Electronics, 1992
Phase singularities in an optical field appear as isolated dark spots and can be generated in active laser cavities or by computer generated holograms. Detection and categorization of these singularities can easily be achieved either by interferometry or Fourier transform pattern recognition using a computer generated hologram.
Heckenberg, N. R., McDuff, R., Smith, C. P., Rubinsztein-Dunlop, H., Wegener, M. J.   +4 more
openaire   +4 more sources

Skyrmionic Polarization Texture around the Phase Singularity of Optical Vortices.

Physical Review Letters
We disclose the existence of a type of optical skyrmion, Gauss-Stokes (GS) skyrmions, that is naturally present in an optical vortex around its phase singularity.
Nilo Mata-Cervera, Deepak K. Sharma, Yijie Shen, Ramón Paniagua-Domínguez, Miguel A. Porras   +4 more
semanticscholar   +1 more source

Phase singularities in beams

American Journal of Physics, 1999
Beams of electromagnetic radiation with phase singularities can transport angular momentum and exert torques on objects. In this paper we discuss the generation of such beams and present a simple analysis of the phenomenon. These beams and their effects have been studied at optical and at millimeter wavelengths. We describe a particularly efficient way
openaire   +1 more source

Dual‐Phase Singularity at a Single Incident Angle with Spectral Tunability in Tamm Cavities

Advances in Materials
The phase singularity, a sudden phase change occurring at the reflection zero is widely explored using various nanophotonic systems such as metamaterials and thin film cavities.
K. V. Sreekanth, Sambhu Jana, Qing Yang Steve Wu, Meng Zhao, Ranjan Singh, Jinghua Teng   +5 more
semanticscholar   +1 more source

Phase singularities in scale-space

Image and Vision Computing, 1991
Abstract This paper concerns the use of phase information from band-pass signals for the measurement of binocular disparity, optic flow and image orientation. Towards this end, one of the important properties of band-pass phase information is its stability with respect to small geometric deformations and contrast changes.
Allan D. Jepson, David J. Fleet
openaire   +1 more source

Near-field phase singularity in subwavelength metallic microstructures

, 2011
A near-field phase singularity (NFPS) depending on the spin state of the incident electromagnetic (EM) radiation is very fascinating because it can enrich the functionality of the EM radiation in metamaterials.
M. Kang, Qinghua Guo, J. Chen, B. Gu, Yongnan Li, Huitian Wang   +5 more
semanticscholar   +2 more sources

Phase singularities, correlation singularities, and conditions for complete destructive interference

Journal of the Optical Society of America A, 2012
A previously derived condition for the complete destructive interference of partially coherent light emerging from a trio of pinholes in an opaque screen is generalized to the case when the coherence properties of the field are asymmetric. It is shown by example that the interference condition is necessary, but not sufficient, and that the existence of
Christopher, Rosenbury, Yalong, Gu, Greg, Gbur   +2 more
openaire   +2 more sources

Detection of Phase Singularities in Triangular Meshes

Methods of Information in Medicine, 2007
Summary Objectives : Phase singularities have become a key marker in animal and computer models of atrial and ventricular fibrillation. However, existing algorithms for the automatic detection of phase singularities are limited to regular, quadratic mesh grids. We present an algorithm to automatically and exactly detect
L J, Rantner, L, Wieser, M C, Stühlinger, F, Hintringer, B, Tilg, G, Fischer   +5 more
openaire   +2 more sources