Phase Singularity Crystals in Transverse Laser Patterns

1991 ◽  
pp. 245-249 ◽  
Author(s):  
F. Battipede ◽  
M. Brambilla ◽  
L. A. Lugiato ◽  
F. Prati ◽  
V. Penna
Keyword(s):  
Phase Singularity

Abstract 1357: Mobility of Epicardial Rotors During Human Ventricular Fibrillation

Circulation ◽  
2007 ◽  
Vol 116 (suppl_16) ◽  
Author(s):  
Martyn P Nash ◽  
Ayman Mourad ◽  
Chris P Bradley ◽  
David J Paterson ◽  
Peter M Sutton ◽  
...  
Keyword(s):  
Coronary Artery Disease ◽  
Cardiac Surgery ◽  
Aortic Valve Disease ◽  
Singularity Analysis ◽  
Epicardial Mapping ◽  
Voltage Versus ◽  
Phase Singularity ◽  
The Mean ◽  
Artery Disease ◽  
Contact Electrodes

Introduction: Stability of reentry during VF may depend on the dynamics of rotor cores. We determined the mobility of rotors during human VF using global epicardial mapping and phase singularity analysis. Methods: In 10 patients undergoing cardiac surgery (6 with coronary artery disease; 4 with aortic valve disease), VF was induced by burst pacing prior to (n=7) or immediately following (n=3) the onset of cardiopulmonary bypass. For each subject, a 20 – 40 s episode of fibrillatory activity was sampled at 1 kHz using an epicardial sock containing 256 unipolar contact electrodes connected to a UnEmap system. Trajectories of persistent epicardial rotors (singularities of phase maps, based on de-trended voltage versus its Hilbert transform, lasting for > 1000 ms) were tracked. The mean core location was determined across the lifetime of each persistent rotor. The rotor was classified as stationary if its core remained within 15 mm of the mean location for more than 90% of its duration. Results: Using the above criteria, the numbers of mobile and stationary rotors varied from patient-to-patient (see figure ). In all but one patient, there were more mobile than stationary rotors. Over all patients, the mean ± SD number of mobile rotors (32 ± 21) was significantly greater than stationary rotors (7 ± 6, P<0.01). Conclusions: At least one stationary rotor was always present during human VF, but it is predominantly characterised by a small number of persistent mobile rotors.

Phase singularity reduction in speckle interferometryby tailoring the spatial coherence of light

2021 ◽  
Author(s):  
Klaus Mantel ◽  
Irina Harder ◽  
Vanusch Nercissian ◽  
Ismail Barakat ◽  
Sergej Rothau
Keyword(s):  
Spatial Coherence ◽  
Phase Singularity

Evolution and Nonreciprocity of Loss-Induced Topological Phase Singularity Pairs

2021 ◽  
Vol 127 (26) ◽  
Author(s):  
Mengqi Liu ◽  
Chen Zhao ◽  
Yixuan Zeng ◽  
Yang Chen ◽  
Changying Zhao ◽  
...  
Keyword(s):  
Topological Phase ◽  
Phase Singularity

scholarly journals A method of generating a random optical field using the Karhunen-Loeve expansion to simulate atmospheric turbulence

2020 ◽  
Vol 44 (1) ◽  
pp. 53-59
Author(s):  
S.N. Khonina ◽  
S.G. Volotovskiy ◽  
M.S. Kirilenko
Keyword(s):  
Numerical Simulation ◽  
Correlation Function ◽  
Atmospheric Turbulence ◽  
Random Environment ◽  
Random Medium ◽  
Optical Field ◽  
Phase Singularity ◽  
Vortex Beams ◽  
Simulation Results ◽  
Random Field Generation

It is proposed to use the random field generation in the numerical simulation of the propagation of radiation through a random medium using method based on the Karhunen–Loeve expansion with various types of correlation operators to describe turbulence simulators. The properties of the calculated simulators of a random medium with a Gaussian correlation function were investigated in modeling the propagation of Laguerre-Gaussian vortex beams. The simulation results showed that an increase in the order of the optical vortex leads, as in the experiment, to lower stability of the phase singularity of the beams to random optical fluctuations. The similarity of the simulation results and the optical experiments indicates the promise of the proposed approach for the synthesis of random environment simulators.

scholarly journals Wavelength and Fibrosis Affect Phase Singularity Locations During Atrial Fibrillation

2018 ◽  
Vol 9 ◽  
Author(s):  
Mirabeau Saha ◽  
Caroline H. Roney ◽  
Jason D. Bayer ◽  
Marianna Meo ◽  
Hubert Cochet ◽  
...  
Keyword(s):  
Atrial Fibrillation ◽  
Phase Singularity

Ultra‐rapid high‐density mapping system with the phase singularity technique is feasible in identifying rotors and focal sources and predicting AF termination

2019 ◽  
Vol 30 (6) ◽  
pp. 952-963 ◽  
Author(s):  
Jennifer Jeanne B. Vicera ◽  
Li‐Wei Lo ◽  
Yamada Shinya ◽  
Yu‐Hui Chou ◽  
Yenn‐Jiang Lin ◽  
...  
Keyword(s):  
High Density ◽  
Phase Singularity ◽  
Density Mapping ◽  
Mapping System

Phase Singularity Motion in Speckle Pattern Evolution

2013 ◽  
Author(s):  
Xiaojun Cheng ◽  
Yitzchak Lockerman ◽  
Azriel Z. Genack
Keyword(s):  
Speckle Pattern ◽  
Phase Singularity
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