Vortices in generalized Stokes parameters

Singh, Rakesh Kumar; Naik, Dinesh N.; Itou, Hitoshi; Miyamoto, Yoko; Takeda, Mitsuo

doi:10.1117/12.859050

Cited by 5 publications

(5 citation statements)

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“…Such phase singularities also exists in the instantaneous or unaveraged generalized Stokes parameters. However singularities appear to be washed out from the spatially averaged GSPs and desired structure in GSPs can be produced using suitably designed source [13]. Fig.4c shows reconstruction of objects encoded into 2( ) s r fringes in terms of 2 ( ) S Δr % .…”

Section: Incoherent Reconstructionmentioning

confidence: 97%

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Stokes holography for recording and reconstructing objects using polarization fringes

et al. 2011

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In this paper, we propose and demonstrate Stokes holography for recording and reconstructing a object using polarization fringes. Reconstruction is carried out by scattering the polarization fringes through ground glass, and replacing the ensemble averages by space averages of the randomly scattered Gaussian field. Object encoded into polarization fringes are reconstructed into their corresponding elements of generalized Stokes parameters. Experimental and numerical results of a point object reconstruction are presented.

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Section: Incoherent Reconstructionmentioning

confidence: 97%

“…GSPs are extension of conventional Stokes parameters from single point to two points and carry information of both coherence-polarization properties of the light. GSPs are a complex quantity in contrast to conventional Stokes parameters [12,13]. Total recording and reconstruction is possible using polarization fringes.…”

Section: Introductionmentioning

confidence: 99%

Stokes holography for recording and reconstructing objects using polarization fringes

et al. 2011

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“…For a particular observation plane, this exact polarization correlation is a function of four variables and hence, difficult to measure experimentally. One can take various approaches for the experimental determination of polarization correlation [45,46]. We took the pragmatic approach and defined our pragmatic polarization correlation as:…”

Section: Theorymentioning

confidence: 99%

Dynamical charge inversion of polarization correlation vortex in propagating vector speckle field

Pandit¹,

Kumar²,

Singh³

2022

J. Opt.

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A study on first-order polarization correlation in propagating vector speckle fields is carried out. Vector speckle field, generated by scattering of Poincare beam, is propagated through a spherical and a cylindrical lens. The first-order polarization correlation was experimentally constructed from intensity images of vector speckle fields at various planes before and after the focal plane. We have shown with supporting experimental and simulation results that polarization correlation vortex experiences charge inversion while vector speckle field propagates through a cylindrical lens. The importance of this study relies on the fact that it provides insight into one of the important properties of light, i.e., the phase between the orthogonal polarization components, how it evolves as the optical field propagates through various optical components. This study could find application in optical data processing, imaging, sensing, speckle meteorology, phase unwrapping, optical communication, etc.

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“…x and r E t ( , ) y at position r and time t, where x and y denotes direction of polarization vector components. The GSPs, first introduced by Korotkova and Wolf in terms of the spectral components of the electric field [11], are now rewritten in terms of the time-varying electric field as [36]…”

Section: Characterization Of Coherence and Polarization Of Spatially ...mentioning

confidence: 99%

“…We base our discussions on the spatial correlation of Poincare vectors and use concept of polarization length. Just as ensemble average is often replaced by time average under the assumption of ergodicity in time, we may replace the ensemble average with space average under the assumption of ergodicity in space [22,30,[34][35][36]. We design an experimental set-up for the generation and detection of the polarization speckle field with a specially designed polarization interferometer.…”

Section: Introductionmentioning

confidence: 99%

Characterization of spatial polarization fluctuations in scattered field

Singh

Naik

Itou

et al. 2014

J. Opt.

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We extend the concept of Poincare vector correlations for the characterization of spatial polarization fluctuations of scattered fields. Spatial (rather than temporal) dynamics of polarization in the scattered field is investigated experimentally by detecting instantaneous polarization with a specially designed polarization interferometer. Use of the Poincare-vector correlation in characterization is demonstrated by determining polarization dynamics of three different cases of scattered fields. This confirms usefulness of the proposed technique in diagnosis of scatterers. Under the condition of spatial ergodicity and Gaussian statistics of the scattered field, we replace the ensemble average of the instantaneous field with the space average, and estimate generalized Stokes parameters (GSPs) of the polarization speckles. Results of GSPs are used to obtain spatial correlation of the Poincare vectors.

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Vortices in generalized Stokes parameters

Cited by 5 publications

References 0 publications

Stokes holography for recording and reconstructing objects using polarization fringes

Stokes holography for recording and reconstructing objects using polarization fringes

Dynamical charge inversion of polarization correlation vortex in propagating vector speckle field

Characterization of spatial polarization fluctuations in scattered field

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