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I. K. Robinson, Ptycho 2013 1
Use of Ptychography to detect Phase Shifts in Crystals during Diffraction
Ian Robinson Jesse Clark Ross Harder Maria Civita Laura Shemilt Joerg Schwenke Yusuf Mohammed Ivan Vartaniants
London Centre for Nanotechnology Research Complex at Harwell
Ptycho2013,
Schloss Hohenkammer, Germany, May 2013
I. K. Robinson, Ptycho 2013 2
Outline • Ptychography measures phase • Crystallographic phase • Experiment on Au nanocrystals • Chromosome imaging
I. K. Robinson, Ptycho 2013 3
X-ray Ptychography J. Rodenburg et al, PRL 98, 034801 (2007)
I. K. Robinson, Ptycho 2013 4
Reconstruction of Probe P. Thibault et al, Science 321 379 (2008)
I. K. Robinson, Ptycho 2013 5
Emil Wolf’s Phasing Scheme
Physics Letters A 374 491 (2010)
I. K. Robinson, Ptycho 2013 6
Ptychography of Gold Nanocrystals Maria Civita, UCL, Ana Diaz, Swiss Light Source
I. K. Robinson, Ptycho 2013 7
Swiss Light Source cSAXS beamline
8 I. K. Robinson, Annecy 2012
9 I. K. Robinson, Annecy 2012
Ptychography of Gold Nanocrystals Maria Civita, UCL, Ana Diaz, Swiss Light Source
I. K. Robinson, Ptycho 2013 10
Transmitted Phase of Gold Nanocrystals Maria Civita, UCL, Ana Diaz, Swiss Light Source
I. K. Robinson, Ptycho 2013 11
Diffraction from a Finite Slab Als-Nielsen and McMorrow, “Modern X-ray Physics”
I. K. Robinson, Ptycho 2013 12
Diffraction from a Finite Slab Als-Nielsen and McMorrow, “Modern X-ray Physics”
I. K. Robinson, Ptycho 2013 13
R
T=1-R
Ptychography of Gold Nanocrystals Maria Civita, UCL, Ana Diaz, Swiss Light Source
I. K. Robinson, Ptycho 2013 14
Dynamical Theory (Ivan Vartaniants)
I. K. Robinson, Ptycho 2013 15
t=100nm t=110nm
Ptychography at 34-ID-C (APS) nPoint 3D scanner, Ross Harder and David Vine
I. K. Robinson, Ptycho 2013 16
Ptychography at 34-ID-C (APS) nPoint 3D scanner, Ross Harder and David Vine
I. K. Robinson, Ptycho 2013 17
#S159 Isolated human chromosome on SiN-‐membrane Reconstructed from ptychography scan with transparent beamstop.
Phase shift (rad)
Transmission (100%)
Chromosome Ptychography Laura Shemilt, Joerg Schwenke, Yusuf Mohammed, 34-ID-C
I. K. Robinson, Ptycho 2013 18
#S152, frame 1 10s exposure 6.5 keV Medipix2, 55 µm 1.851 m distance
75 nm
50 nm 50 nm
Inte
nsity
(log
10)
50 nm
Chromosome Ptychography Laura Shemilt, Joerg Schwenke, Yusuf Mohammed, 34-ID-C
I. K. Robinson, Ptycho 2013 19
I. K. Robinson, Ptycho 2013 20
Conclusions and Acknowledgements • Crystallographic phase determination • Absolute phase of Structure Factor • Ripples in images due to beam stop?
Ana Diaz Swiss Light Source Cameron Kewish Manuel Guizar-Sicairos Ross Harder Advanced Photon Source