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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial",sans-serif">Please join us today -
<b>Tuesday, April 19<sup>th</sup> – </b>for a Colloquium<b> at 3:45 p.m. </b>with<b> Dr. Manuel Guizar- Sicairos,
</b>Paul Scherrer Institut</span><b><span style="font-size:12.0pt;font-family:"Helvetica",sans-serif;background:white"><o:p></o:p></span></b></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt;background:white"><span style="font-size:12.0pt;font-family:"Helvetica",sans-serif;color:black">Faculty Host: Rolando Valdes-Aguilar<o:p></o:p></span></p>
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<span style="font-size:12.0pt;font-family:"Helvetica",sans-serif;color:black">Please use the Zoom link below to attend virtually.</span><span style="font-size:12.0pt;font-family:"Helvetica",sans-serif"><o:p></o:p></span></p>
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<p class="MsoPlainText"><b><span style="font-size:18.0pt">X-ray coherent lensless imaging and ptychography at Synchrotron sources<o:p></o:p></span></b></p>
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<p class="MsoPlainText"><b><span style="font-size:12.0pt">Abstract:<o:p></o:p></span></b></p>
<p class="MsoPlainText"><span style="font-size:12.0pt">X-rays have a wavelength ranging from a few nm to below 1 nm, therefore offer the opportunity to probe matter even down to atomic resolution. Combined with their very low absorption, they are ideal for
nanoscale-resolution imaging in 3D, with important applications for energy functional materials as well as biology. However, manufacturing efficient high-resolution X-ray lenses is very challenging and a current bottleneck for resolution. If the X-ray source
is sufficiently coherent, as is the case for Synchrotron X-ray light sources, then imaging lenses can be forgone altogether and instead computational reconstructions can be used, for example via holography or iterative phase retrieval algorithms. Ptychography
is a technique belonging to the latter group, where intensity far-field measurements are processed iteratively in order to retrieve the phase that is not measured by the detector, effectively recovering a high-resolution image of the sample. Ptychography is
highly versatile, and can be used with different wavelengths and experimental geometries. In this talk I will introduce the technique, basic reconstruction algorithms, and highlight its applications for X-ray nanotomography.<o:p></o:p></span></p>
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<p class="MsoPlainText"><b><span style="font-size:12.0pt">Short bio:<o:p></o:p></span></b></p>
<p class="MsoPlainText"><span style="font-size:12.0pt">Manuel Guizar-Sicairos (he/him) received his B.Sc. and M.Sc. from the Tecnológico de Monterrey, Mexico, and his Ph.D. from the University of Rochester in 2010. Currently, he is a senior scientist at the
coherent small-angle X-ray scattering (cSAXS) beamline of the Swiss Light Source (SLS) and has coauthored over 100 peer-reviewed publications. Manuel is the 2019 ICO prize recipient and is a Fellow Member of Optica and the SPIE. He has contributed to novel
approaches in X-ray coherent imaging including X-ray holography, to phase retrieval, ptychography, small-angle X-ray scattering, and tomography.<o:p></o:p></span></p>
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<span style="font-size:12.0pt;font-family:"Helvetica",sans-serif;color:black">Zoom link:<o:p></o:p></span></p>
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<span style="font-size:12.0pt;font-family:"Helvetica",sans-serif;color:#555555"><a href="https://osu.zoom.us/j/94858307115?pwd=K0JDMTROWVhIOUp6bU1sU0prZjNUZz09"><span style="color:#BA0C2F">https://osu.zoom.us/j/94858307115?pwd=K0JDMTROWVhIOUp6bU1sU0prZjNUZz09</span></a><o:p></o:p></span></p>
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<span style="font-size:12.0pt;font-family:"Helvetica",sans-serif;color:black">Meeting ID: <strong><span style="font-family:"Helvetica",sans-serif">948 5830 7115</span></strong></span><span style="font-size:12.0pt;font-family:"Helvetica",sans-serif"><o:p></o:p></span></p>
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<span style="font-size:12.0pt;font-family:"Helvetica",sans-serif;color:black">Password: <strong><span style="font-family:"Helvetica",sans-serif">PRB1080</span></strong></span><strong><span style="font-family:"Calibri",sans-serif;color:black"><o:p></o:p></span></strong></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#333333"><img border="0" width="224" height="45" style="width:2.3333in;height:.4687in" id="x_Picture_x0020_1" src="cid:image001.png@01D84D79.12F02820" alt="The Ohio State University"></span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#333333"><br>
</span><b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#BB0000;background:white">Ruth Leonard</span></b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#333333"><br>
Executive Assistant to the Chair<br>
</span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#BB0000;background:white">Department of Physics</span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#333333">
<br>
Physics Research Building, 191 West Woodruff Ave, Columbus, OH 43210<br>
614-292-5018 Office<br>
</span><span style="font-size:12.0pt;font-family:"Times New Roman",serif;color:black"><a href="mailto:leonard.469@osu.edu"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;background:white">leonard.469@osu.edu</span></a></span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#333333">
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