Optical Correlation Diagnostics of Phase Singularities in Polychromatic Fields

2009 ◽  
pp. 133-165 ◽  
Author(s):  
P. Polyanskii
Keyword(s):  
Optical Correlation ◽  
Phase Singularities

Optical correlation diagnostics of phase singularities

2009 ◽  
Author(s):  
Oleg V. Angelsky ◽  
Alexander P. Maksimyak ◽  
Peter P. Maksimyak
Keyword(s):  
Optical Correlation ◽  
Phase Singularities

Optical correlation measurement of switching transients in high-speed semiconductor lasers

1986 ◽  
Vol 22 (7) ◽  
pp. 396 ◽  
Author(s):  
J.M. Wiesenfeld ◽  
R.S. Tucker ◽  
P.M. Downey ◽  
J.E. Bowers
Keyword(s):  
Semiconductor Lasers ◽  
High Speed ◽  
Correlation Measurement ◽  
Optical Correlation

Optical correlation devices for measuring randomly phased objects

1993 ◽  
Vol 32 (12) ◽  
pp. 3235 ◽  
Author(s):  
Oleg V. Angelsky
Keyword(s):  
Optical Correlation

scholarly journals Moiré pattern of interference dislocations in condensate of indirect excitons

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
J. R. Leonard ◽  
Lunhui Hu ◽  
A. A. High ◽  
A. T. Hammack ◽  
Congjun Wu ◽  
...  
Keyword(s):  
Long Range ◽  
Direct Measurement ◽  
Quantum Systems ◽  
Matter Waves ◽  
Moire Pattern ◽  
Indirect Excitons ◽  
Moiré Pattern ◽  
Moiré Effect ◽  
Phase Singularities ◽  
Bose Einstein

AbstractInterference patterns provide direct measurement of coherent propagation of matter waves in quantum systems. Superfluidity in Bose–Einstein condensates of excitons can enable long-range ballistic exciton propagation and can lead to emerging long-scale interference patterns. Indirect excitons (IXs) are formed by electrons and holes in separated layers. The theory predicts that the reduced IX recombination enables IX superfluid propagation over macroscopic distances. Here, we present dislocation-like phase singularities in interference patterns produced by condensate of IXs. We analyze how exciton vortices and skyrmions should appear in the interference experiments and show that the observed interference dislocations are not associated with these phase defects. We show that the observed interference dislocations originate from the moiré effect in combined interference patterns of propagating condensate matter waves. The interference dislocations are formed by the IX matter waves ballistically propagating over macroscopic distances. The long-range ballistic IX propagation is the evidence for IX condensate superfluidity.

scholarly journals Wavefront dislocations reveal the topology of quasi-1D photonic insulators

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Clément Dutreix ◽  
Matthieu Bellec ◽  
Pierre Delplace ◽  
Fabrice Mortessagne
Keyword(s):  
Local Density ◽  
Topological Defects ◽  
Wave Functions ◽  
Topological Classification ◽  
Local Density Of States ◽  
Topological Phase Transition ◽  
Interference Fringes ◽  
Classical Wave ◽  
Phase Singularities

AbstractPhase singularities appear ubiquitously in wavefields, regardless of the wave equation. Such topological defects can lead to wavefront dislocations, as observed in a humongous number of classical wave experiments. Phase singularities of wave functions are also at the heart of the topological classification of the gapped phases of matter. Despite identical singular features, topological insulators and topological defects in waves remain two distinct fields. Realising 1D microwave insulators, we experimentally observe a wavefront dislocation – a 2D phase singularity – in the local density of states when the systems undergo a topological phase transition. We show theoretically that the change in the number of interference fringes at the transition reveals the topological index that characterises the band topology in the insulator.

Tracking blood flow and tissue motion using optical correlation

1993 ◽  
Author(s):  
Natalie Clark ◽  
Michael K. Giles ◽  
Sarah H. Harrison ◽  
Chris P. Hofer
Keyword(s):  
Blood Flow ◽  
Optical Correlation ◽  
Tissue Motion
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