## Observation of singularities in multiply scattered microwave fields

JOSA A, Vol. 24, Issue 10, pp. A33-A38 (2007)

http://dx.doi.org/10.1364/JOSAA.24.000A33

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### Abstract

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.

© 2007 Optical Society of America

**OCIS Codes**

(030.6140) Coherence and statistical optics : Speckle

(030.6600) Coherence and statistical optics : Statistical optics

(120.5050) Instrumentation, measurement, and metrology : Phase measurement

**History**

Original Manuscript: March 27, 2007

Manuscript Accepted: May 15, 2007

Published: August 20, 2007

**Virtual Issues**

Photonic Metamaterials (2007) *JOSA A*

**Citation**

Sheng Zhang, Bing Hu, Yitzchak Lockerman, Patrick Sebbah, and Azriel Z. Genack, "Observation of singularities in multiply scattered microwave fields," J. Opt. Soc. Am. A **24**, A33-A38 (2007)

http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-24-10-A33

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