Near field scattering

Giglio, M.; Brogiol, Doriano; Potenza, M. A. C.; Vailati, Alberto

doi:10.1039/b314600f

Cited by 19 publications

(22 citation statements)

References 4 publications

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“…20 This is due to scattering from 2D structures (Raman-Nath 21 ) and disappears when the 3D Bragg scattering regime is reached. 22 The second is a subtle effect which changes the oscillation phase with the size of the scatterers, therefore producing a scattering signal that is sample dependent. This effect was described and exploited in Ref.…”

Section: Appendix B: Modified Talbot Effectmentioning

confidence: 99%

SODI-COLLOID: A combination of static and dynamic light scattering on board the International Space Station

Mazzoni

Potenza

Alaimo

et al. 2013

Review of Scientific Instruments

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Determination of hydrodynamic properties in highly charged colloidal systems using static and dynamic light scattering J. Chem. Phys. 110, 7070 (1999) Microgravity research in space is a complex activity where the often scarce resources available for the launch, accommodation, and operation of instrumentation call for a careful experiment planning and instrument development. In this paper we describe a module of the Selectable Optical Diagnostic Instrument, that has been designed as a compact optical diagnostic instrument for colloidal physics experiments. The peculiarity of the instrument is the combination of a novel light scattering technique known as near field scattering and standard microscopy with a low-coherence laser light source. We describe its main design features, as well as measurement results on colloidal aggregation taken on the International Space Station.

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Section: Appendix B: Modified Talbot Effectmentioning

confidence: 99%

SODI-COLLOID: A combination of static and dynamic light scattering on board the International Space Station

Mazzoni

Potenza

Alaimo

et al. 2013

Review of Scientific Instruments

View full text Add to dashboard Cite

show abstract

“…However, it is important to note that the properties of these two types of speckle patterns are fundamentally different. While far-field speckles are linked to the illuminating beam, its dimensions and wavelength, it has been shown that in the near field the properties of the speckles are closely related to the scattering features themselves, and the speckle size is independent of the propagation distance and the energy of the beam [116][117][118][119][120][121][122].…”

Section: Introductionmentioning

confidence: 99%

State of the Art of X-ray Speckle-Based Phase-Contrast and Dark-Field Imaging

Zdora

2018

J. Imaging

102

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Abstract:In the past few years, X-ray phase-contrast and dark-field imaging have evolved to be invaluable tools for non-destructive sample visualisation, delivering information inaccessible by conventional absorption imaging. X-ray phase-sensing techniques are furthermore increasingly used for at-wavelength metrology and optics characterisation. One of the latest additions to the group of differential phase-contrast methods is the X-ray speckle-based technique. It has drawn significant attention due to its simple and flexible experimental arrangement, cost-effectiveness and multimodal character, amongst others. Since its first demonstration at highly brilliant synchrotron sources, the method has seen rapid development, including the translation to polychromatic laboratory sources and extension to higher-energy X-rays. Recently, different advanced acquisition schemes have been proposed to tackle some of the main limitations of previous implementations. Current applications of the speckle-based method range from optics characterisation and wavefront measurement to biomedical imaging and materials science. This review provides an overview of the state of the art of the X-ray speckle-based technique. Its basic principles and different experimental implementations as well as the the latest advances and applications are illustrated. In the end, an outlook for anticipated future developments of this promising technique is given.

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“…The finite thickness of the sample and the walkoff effect related to the limited sensor size [34][35][36] induce a tapering on Talbot oscillations clearly visible for τ < 10 fs. This prevents to generate the master curves upon the scalings described in Eq.…”

Section: Results Using Narrowband Beamsmentioning

confidence: 96%

Characterizing temporal coherence of visible synchrotron radiation with heterodyne near field speckles

Siano

Potenza

Torino

et al. 2017

Phys. Rev. Accel. Beams

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In this paper we extensively describe the heterodyne near field speckle method (HNFS) to characterize both spatial and temporal coherence of synchrotron radiation (SR). The method relies on Fourier analysis of near field speckles generated by scattering from nanoparticles suspended in a liquid. A criterion based on master curves of power spectra is introduced and validated by measurements on the visible light produced by the ALBA bending dipole. While spatial coherence measurements with HNFS have been reported, we present for the first time measurements of the temporal coherence of SR wavefronts with the HNFS method both for narrowband and white light beams. In the former case, using a band-pass filter, a coherence time of 40 AE 10 fs is measured, in good agreement with the expected value of 43 fs for the filter inverse linewidth. Moreover, by exploiting the self-reference scheme of the technique, we show that coherence areas propagate carrying nonvanishing curvature. In the latter case, the measured coherence time of the incident SR without any monochromator is 1.6 AE 0.4 fs, corresponding to a bandwidth of 240 nm at a peak wavelength of 350 nm. Exploiting the Wiener-Kintchine theorem, we also retrieve the SR power spectral density at the sample position from the measured temporal coherence function. Results are in good agreement with the measurements performed using a standard spectrometer, yielding a coherence time of 1.4 fs.

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Near field scattering

Cited by 19 publications

References 4 publications

SODI-COLLOID: A combination of static and dynamic light scattering on board the International Space Station

SODI-COLLOID: A combination of static and dynamic light scattering on board the International Space Station

State of the Art of X-ray Speckle-Based Phase-Contrast and Dark-Field Imaging

Characterizing temporal coherence of visible synchrotron radiation with heterodyne near field speckles

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