Results 141 to 150 of about 1,387 (173)
Optics Letters, 2018 We realized a phase retrieval technique using terahertz (THz) radiation as an alternative to THz digital holography, named THz ptychography. Ptychography has been used in x-ray imaging as a groundbreaking improvement of conventional coherent diffraction imaging. Here we show that ptychography can be performed at THz frequencies too. We reconstructed an
Thomas Feurer +2 more
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Ptychography in anisotropic media [PDF]
Optics Letters, 2015 This letter describes ptychography in the context of polarized light probing anisotropic specimen (i.e., showing properties of birefringence and/or diattenuation). We established an optimization strategy using a vectorial formalism. We propose a measurement scheme using a set of linearly polarized probes and linear polarization analyzers, which allows ...
Virginie Chamard, Patrick Ferrand
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Ptychography by changing the area of probe light and scaled ptychography [PDF]
Optics Communications, 2014 Ptychography is a promising phase retrieval technique for visible light, X-ray and electron beams. Conventional ptychography reconstructs the amplitude and phase of an object light from a set of the diffraction intensity patterns obtained by the X-Y moving of the probe light.
Tomoyoshi Itô +2 more
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Ptychography with multilayer Laue lenses
Journal of Synchrotron Radiation, 2014 Two different multilayer Laue lens designs were made with total deposition thicknesses of 48 µm and 53 µm, and focal lengths of 20.0 mm and 12.5 mm at 20.0 keV, respectively. From these two multilayer systems, several lenses were manufactured for one- and two-dimensional focusing.
Adam Kubec +2 more
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Information multiplexing in ptychography
Ultramicroscopy, 2014We show for the first time that ptychography (a form of lensless diffractive imaging) can recover the spectral response of an object through simultaneous reconstruction of multiple images that represent the object's response to a particular mode present in the illumination.
Darren Batey +2 more
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zPIE: an autofocusing algorithm for ptychography [PDF]
Optics Letters, 2020 An autofocusing algorithm for ptychography is proposed. The method optimizes a sharpness metric that would be observed in a differential interference microscope and is valid for both amplitude and phase modulating specimens. We experimentally demonstrate that the algorithm, based on the extended ptychographic iterative engine (ePIE), calibrates the ...
Lars Loetgering +2 more
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Multiplexed Single-Shot Ptychography
Imaging and Applied Optics 2018 (3D, AO, AIO, COSI, DH, IS, LACSEA, LS&C, MATH, pcAOP), 2018We demonstrate experimentally multiplexed single-shot ptychography. Specifically, we present a polarization-resolved single-shot ptychographic microscope, where the orthogonally polarized amplitudes and phases of a polarization-sensitive object are reconstructed from ptychographic data recorded in a single camera exposure.
Bing Kuan, Chen +4 more
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Optics Letters, 2016
We present an imaging technique combining Zernike phase-contrast imaging and ptychography. The contrast formation is explained by following the theory of Zernike phase-contrast imaging. The method is demonstrated with x-rays at a photon energy of 6.2 keV, showing how ptychographic reconstruction of a phase sample leads to a Zernike phase-contrast image
Vartiainen, Ismo +5 more
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We present an imaging technique combining Zernike phase-contrast imaging and ptychography. The contrast formation is explained by following the theory of Zernike phase-contrast imaging. The method is demonstrated with x-rays at a photon energy of 6.2 keV, showing how ptychographic reconstruction of a phase sample leads to a Zernike phase-contrast image
Vartiainen, Ismo +5 more
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Single-shot ptychography & sparsity-based subwavelength ptychography
Frontiers in Optics 2015, 2015We overcome two major limitations in ptychography - a powerful scanning coherent diffraction imaging technique. We demonstrate single-shot ptychography, overcoming the scanning temporal resolution limit and demonstrate sparsity-based subwavelength ptychography, overcoming the Abbe resolution limit.
Pavel Sidorenko +5 more
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Superresolution imaging via ptychography
Journal of the Optical Society of America A, 2011Coherent diffractive imaging of objects is made considerably more practicable by using ptychography, where a set of diffraction patterns replaces a single measurement and introduces a high degree of redundancy into the recorded data. Here we demonstrate that this redundancy allows diffraction patterns to be extrapolated beyond the aperture of the ...
Andrew M, Maiden +3 more
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