Observation of singularities in multiply scattered microwave fields

Sheng Zhang, Bing Hu, Yitzchak Lockerman, Patrick Sebbah, Azriel Z. Genack

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


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.

Original languageEnglish
Pages (from-to)A33-A38
JournalJournal of the Optical Society of America A: Optics and Image Science, and Vision
Issue number10
StatePublished - Oct 2007
Externally publishedYes


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