TY - JOUR
T1 - Observation of singularities in multiply scattered microwave fields
AU - Zhang, Sheng
AU - Hu, Bing
AU - Lockerman, Yitzchak
AU - Sebbah, Patrick
AU - Genack, Azriel Z.
PY - 2007/10
Y1 - 2007/10
N2 - Speckle patterns of arbitrary resolution are obtained by applying the sampling theorem to measurements of two orthogonal components of the microwave field transmitted through multiply scattering samples. Core structures of phase singularities, phase critical points, and polarization singularities are explored. We find that equiphase lines connect phase singularities with opposite topological signs except for the bifurcation lines, which run through a phase saddle point, in agreement with predictions by Freund [Phys. Rev. E 25, 2348 (1995)]. We observe hyperbolic equiphase lines near phase saddle points and elliptical equiphase lines around phase extrema. Polarization singularities of the vector field with the three morphologies predicted are observed.
AB - Speckle patterns of arbitrary resolution are obtained by applying the sampling theorem to measurements of two orthogonal components of the microwave field transmitted through multiply scattering samples. Core structures of phase singularities, phase critical points, and polarization singularities are explored. We find that equiphase lines connect phase singularities with opposite topological signs except for the bifurcation lines, which run through a phase saddle point, in agreement with predictions by Freund [Phys. Rev. E 25, 2348 (1995)]. We observe hyperbolic equiphase lines near phase saddle points and elliptical equiphase lines around phase extrema. Polarization singularities of the vector field with the three morphologies predicted are observed.
UR - http://www.scopus.com/inward/record.url?scp=36949030700&partnerID=8YFLogxK
U2 - 10.1364/josaa.24.000a33
DO - 10.1364/josaa.24.000a33
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AN - SCOPUS:36949030700
SN - 1084-7529
VL - 24
SP - A33-A38
JO - Journal of the Optical Society of America A: Optics and Image Science, and Vision
JF - Journal of the Optical Society of America A: Optics and Image Science, and Vision
IS - 10
ER -