Joint estimation of object and probes in vectorial ptychography

Baroni, Arthur; Allain, Marc; Li, Peng; Chamard, Virginie; Ferrand, Patrick

doi:10.1364/oe.27.008143

Cited by 17 publications

(18 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…8). The optical behavior of the metahologram is exhaustively quantified and measured experimentally by means of optical vectorial ptychography 27,28 . This technique, which enables direct mapping of the metasurface Jones Matrices (see Methods and Supplementary Fig.…”

Section: Resultsmentioning

confidence: 99%

“…In previous works, we have demonstrated theoretically 34 and experimentally 27 how to use polarized illuminating probes, together with recording of the intensity diffraction patterns behind an analyzer, in order to reconstruct the Jones matrix map of the investigated object, in addition to the joint reconstruction of the each illumination probe used in the measurement, detailed in ref. 28 .…”

Section: Measurement Of Efficiencymentioning

confidence: 99%

“…At each scanning position, three linearly polarized probes at angles of 0, 60, 120°in the object plane and three linear analyses at angles 0, 60, 120°were used, resulting in nine different combinations. Object reconstructions were performed by means of the conjugate gradient algorithm, allowing the estimation of Jones matrices of the meta-holograms, jointly with the estimation of the three illumination probes used for the measurement 28 . Jones matrices reconstruction are been obtained after 530 iterations, run on a The red and blue dots indicate the designed and measured polarization, respectively.…”

Section: Measurement Of Efficiencymentioning

confidence: 99%

See 2 more Smart Citations

Ptychography retrieval of fully polarized holograms from geometric-phase metasurfaces

et al. 2020

Self Cite

View full text Add to dashboard Cite

Controlling light properties with diffractive planar elements requires full-polarization channels and accurate reconstruction of optical signal for real applications. Here, we present a general method that enables wavefront shaping with arbitrary output polarization by encoding both phase and polarization information into pixelated metasurfaces. We apply this concept to convert an input plane wave with linear polarization to a holographic image with arbitrary spatial output polarization. A vectorial ptychography technique is introduced for mapping the Jones matrix to monitor the reconstructed metasurface output field and to compute the full polarization properties of the vectorial far field patterns, confirming that pixelated interfaces can deflect vectorial images to desired directions for accurate targeting and wavefront shaping. Multiplexing pixelated deflectors that address different polarizations have been integrated into a shared aperture to display several arbitrary polarized images, leading to promising new applications in vector beam generation, full color display and augmented/ virtual reality imaging.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Measurement Of Efficiencymentioning

confidence: 99%

Section: Measurement Of Efficiencymentioning

confidence: 99%

See 1 more Smart Citation

Ptychography retrieval of fully polarized holograms from geometric-phase metasurfaces

et al. 2020

Self Cite

View full text Add to dashboard Cite

show abstract

“…3 represent results after applying this calibration. (In typical ptychography experiments where the coordinate system is centered on the probe this phase parabola appears on the probe rather than the object and can easily be taken into account [29].) Fig.…”

Section: Resulting Reconstructionsmentioning

confidence: 99%

Confocal Bragg ptychography for bulk specimens: a numerical demonstration

Pedersen¹,

Chamard²,

Poulsen³

2020

Opt. Express

Self Cite

View full text Add to dashboard Cite

We report on a new X-ray imaging method, which generalizes Bragg ptychography to 3D mapping of embedded crystalline volumes within thick specimens. The sample is probed by a pencil X-ray beam. The diffracted beam is magnified by an objective and passes through a slit in the image plane to be monitored by a 2D detector in the far-field of the image plane. The dimensions of the incoming beam and the slit opening define a confocal Bragg volume. Scanning the sample with respect to this probe volume, an iterative oversampling routine is used to reconstruct the shape and projected displacement field of extended internal volumes. This routine takes into account the pupil function and known aberrations of the lens. We demonstrate the method by a numerical study of a 3.5 µm grain comprising a wall of edge dislocations. With a probe volume of ∼0.12 µm 3 and a compound refractive lens with a numerical aperture of 0.49×10 −3 as the objective, the dislocations are fully resolved with a displacement sensitivity of ∼10 pm. The spatial resolution is 26×27×123 nm 3 (rms), with the poor resolution along the optical axis being limited by the probe size. With a four times larger numerical aperture, the resolution becomes 16×8×123 nm 3 (rms). The lens aberrations are found to be not critical.

show abstract

“…An obvious next step is to combine the orientation sensitivity of resonant X-ray microscopy with the high spatial resolution of ptychography. However, this program is not trivial (Ferrand et al, 2015(Ferrand et al, , 2018Baroni et al, 2019). Consider, for instance, a material which is transparent but birefringent and has alternating stripes with the slow axis horizontal or vertical.…”

Section: Introductionmentioning

confidence: 99%

Analyzer-free linear dichroic ptychography

2020

View full text Add to dashboard Cite

Linear dichroism is an important tool to characterize the transmission matrix and determine the crystal or orbital orientation in a material. In order to achieve high-resolution mapping of transmission properties, the linear-dichroism scattering model in ptychographic imaging is introduced, and an efficient two-stage reconstruction algorithm is developed. Using the proposed algorithm on a uniaxial material, the dichroic transmission matrix can be recovered without an analyzer by using ptychography measurements with as few as three different polarization angles, with the help of an empty region to remove phase ambiguities.

show abstract

Joint estimation of object and probes in vectorial ptychography

Cited by 17 publications

References 16 publications

Ptychography retrieval of fully polarized holograms from geometric-phase metasurfaces

Ptychography retrieval of fully polarized holograms from geometric-phase metasurfaces

Confocal Bragg ptychography for bulk specimens: a numerical demonstration

Analyzer-free linear dichroic ptychography

Contact Info

Product

Resources

About