John Rodenburg, The University of Sheffield, UK
Title: Ultimate transmission imaging of the solid state: beyond the paradigm of the electron and X-ray lens

John Rodenburg undertook his PhD, a two-year RA position, and then a ten-year Royal Society Research Fellowship at the Cavendish Laboratory, University of Cambridge. In 1999 he moved to a Research Chair at the Materials Research Institute (now MERI) at Sheffield Hallam University. Since 2003 he has been at the University of Sheffield where he holds a Personal Chair in the Department of Electronic and Electrical Engineering. His early work was on instrument development in electron microscopy and its application to material science. More recently, he has developed a number of computational methods for solving the phase problem, thus enabling the use diffraction data to reconstruct transmission images at higher resolution and with greater sensitivity than that achievable with lenses alone. This has potentially wide application in sub-atomic electron imaging and sub 50-nanometre scale X-ray imaging. One of these approaches - iterative ptychographic imaging - is now being widely taken up in the X-ray microscopy community and has just been used to demonstrate that electron lens resolution can be improved upon by a factor of five. Although the work with electrons is still at an early stage, it has the potential to make an enormous impact in the ultra-high resolution imaging of condensed matter.