About me - the past

Received a B.Sc. degree in Physics Engineering in 2002 and M.Sc. in Electronic Systems in 2005 from the Tecnológico de Monterrey, Mexico. Received a M.Sc. in Optics in 2008 and Ph.D. in Optics in 2010 from the Institute of Optics, University of Rochester in NY. Early in 2003 I joined the Photonics and Mathematical Optics Group (PMOG) and started working as a research assistant under Dr. Julio C. Gutierrez-Vega, where I was involved in research in analysis of mode competition in unstable optical resonators (my Master's dissertation), numerical methods for propagation and non-diffracting beams. In 2005 I started the Ph.D. program in optics at the Institute of Optics in Rochester NY and joined the Phase Retrieval and Imaging Science group (PRAISE), headed by Dr. James R. Fienup. My doctoral research was mainly focused on the development and advance of phase retrieval (in particular ptychography) and holography for application to high-resolution lensless imaging and wavefront measurement at x-ray wavelengths [+]. In 2010 I held a postdoctoral appointment and in 2011 started as beamline scientist at the cSAXS beamline, Swiss Light Source, Paul Scherrer Institut.


My main interest is in the development of methods and advanced algorithms for computational imaging. Currently I am involved in developing and establishing ptychographic X-ray computed tomography (PXCT) and scanning small-angle X-ray scattering (SAXS) tomography. These two techniques are quite complementary. While PXCT is capable of direct imaging nanostructure of samples of tens of microns diameter with a resolution under 20 nm, SAXS tomography can survey and obtain statistical information of nanostructure in macroscopic specimens. More information on work done by our group can be obtained from our group's research page.

Beamline Scientist
Coherent X-ray Scattering group
Swiss Light Source
Paul Scherrer Institut

Methods for coherent lensless imaging and x-ray wavefront measurement (PhD Thesis) [+]

Statistics on publications on ResearcherID I-4899-2013

Research interests 
  • Phase retrieval 
  • Lensless imaging (Coherent Diffractive Imaging) 
  • Tomgraphy 
  • Holography 
  • Wavefront measurement 
  • Non-diffracting optical fields 
  • Numerical methods for propagation 

Algorithm implementations

Matlab codes for computing the quasi-discrete Hankel transform (QDHT) and for efficient subpixel image registration by cross correlation, are available through Matlab Central file exchange.

Implementations of the subpixel image registration made by an independent groups are available in Python and Julia languages.

Codes associated to the cSAXS beamline [+]