Conference Agenda

Topical Meetings and Sessions:

TOM 1 - Silicon Photonics and Guided-Wave Optics
TOM 2 - Computational, Adaptive and Freeform Optics
TOM 3 - Optical System Design, Tolerancing and Manufacturing
TOM 4 - Bio-Medical Optics
TOM 5 - Resonant Nanophotonics
TOM 6 - Optical Materials: crystals, thin films, organic molecules and polymers, syntheses, characterization and devices
TOM 7 - Thermal radiation and energy management
TOM 8 - Nonlinear and Quantum Optics
TOM 9 - Optics at Nanoscale (ONS)
TOM 10 - Optical Microsystems (OMS)
TOM 11 - Waves in Complex Photonic Media
TOM 12 - Optofluidics
TOM 13 - Ultrafast Optical Technologies and Applications
TOM 14 - Advances and Applications of Optics and Photonics
EU Project Session
Early Stage Researcher Session organised by SIOF
Grand Challenges of Photonics Session

More information on the Topical Meetings

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Session Overview
Session
Opening: Opening of the Conference and Plenary talk by Manuel Guizar-Sicairos
Time:
Tuesday, 14/Sept/2021:
8:30 - 10:00

Location: Aula 1

1st floor

Presentations
8:30 - 9:15
ID: 554 / Opening: 1
Plenary talks

Harnessing coherence and computational imaging for nanoscale structure characterization using X-rays

Manuel Guizar-Sicairos

Paul Scherrer Institut, Switzerland

Access to local information about material composition and its distribution at the nanoscale is of chief importance for studying functional materials both for biology and materials science, as well as for the fundamental understanding of physical properties. X-ray imaging with high-energy photons, otherwise known as hard X-rays, offers an opportunity for deriving such information in a minimally intrusive procedure. This is due to the high penetration depth of hard X-rays, which allows probing intact representative volumes, and combined with their sub-nm wavelength opens the door to nm-scale imaging. One of the challenges for nm-resolution imaging at these energies lies in the fabrication of lenses of sufficient quality. If the X-ray source is coherent, then imaging lenses can be forgone altogether and instead computational reconstructions can be used, for example via holography or iterative phase retrieval algorithms. In this talk, I will provide an introduction to some of the coherent lensless imaging techniques used in X-ray microscopy for nanoscale imaging: X-ray holography, coherent diffractive imaging, and ptychography. Furthermore, I will show examples from the state of the art methods and how they are used today for nanoscale 3D imaging, imaging of fast dynamics, and chemical characterization of functional materials. I will also introduce the principle, and practical examples, of surveying nanostructure properties on macroscopic-scale samples using scanning small angle X-ray scattering (SAXS). In our group, we have generalized this technique using tensor tomography in order to probe statistical anisotropy of nanostructure in samples on the order of millimeters in linear size.