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Instruments / Technical Area	Publication Details	Published
I05-ARPES	Zone plates for angle-resolved photoelectron spectroscopy providing sub-micrometre resolution in the extreme ultraviolet regime Benedikt Rösner , Pavel Dudin , Jeroen Bosgra , Moritz Hoesch , Christian David Journal Of Synchrotron Radiation 26 DOI: 10.1107/S1600577519000869 Diamond Proposal Number(s): [16764, 14488] Open Access Show Abstract ▼ Abstract: This article reports on the fabrication and testing of dedicated Fresnel zone plates for use at the nano-ARPES branch of the I05-ARPES beamline of Diamond Light Source to perform angle-resolved photoelectron spectroscopy with sub-micrometre resolution in real space. The aim of the design was to provide high photon flux combined with sub-micrometre spot sizes. The focusing lenses were tested with respect to efficiency and spatial resolution in the extreme ultraviolet between 50 eV and 90 eV. The experimentally determined diffraction efficiencies of the zone plates are as high as 8.6% at 80 eV, and a real-space resolution of 0.4 µm was demonstrated. Using the zone-plate-based setup, monolayer flakes of the two-dimensional semiconductor WS2 were investigated. This work demonstrates that the local electronic structure can be obtained from an area of a few micrometres across a two-dimensional heterostructure.	Mar 2019
I13-1-Coherence	Novel Methods for Hard X-ray Holographic Lensless Imaging M. Saliba , J. Bosgra , A. D. Parsons , U. H. Wagner , C. Rau , P. Thibault Microscopy And Microanalysis 22, 110 - 111 DOI: 10.1017/S1431927616001409 Open Access Show Abstract ▼ Abstract: Holography is a coherent imaging method that provides complex-valued reconstructions of the wave field at the exit of a sample by virtue of the interference between the scattered sample wave and a reference wave [1]. Fourier transform holography (FTH) is a robust and reliable method where reconstructions are obtained by a single Fourier transform, owing to a nearby point-scatterer whose transmission function is approximated to a delta function [2]. Hence, the total autocorrelation function includes the cross-correlation between the sample function and the delta-like reference function, leading to two separated twin images of the sample. Holographic techniques emerged using different types of reference structures such as extended references [3] (slits, corner apertures, etc.), uniformly redundant arrays, and customised references [4]. Such methods have been successfully implemented using soft X-rays [2,3,4,5]. However, for hard X-rays, the fabrication of high-resolution fully absorbing reference masks is almost impossible. Therefore, high-resolution holographic diffraction imaging with hard X-rays requires a solution to the fabrication limitations. Furthermore, for an absorbing mask, most methods have also employed a “monolithic” frame [5] where the reference and sample are bound on the same substrate. This limits the flexibility of the setup and inhibits independent translation and rotation.	Jul 2016
I13-1-Coherence Data acquisition Insertion Devices	Transmission x-ray microscopy at Diamond-Manchester I13 Imaging Branchline Joan Vila-comamala , Jeroen Bosgra , David S. Eastwood , Ulrich Wagner , Andrew Bodey , Miryam Garcia-fernandez , Christian David , Christoph Rau Null XRM 2014: Proceedings of the 12th International Conference on X-Ray Microscopy DOI: 10.1063/1.4937530 Show Abstract ▼ Abstract: Full-field Transmission X-ray Microscopy (TXM) has been shown to be a powerful method for obtaining quantitative internal structural and chemical information from materials at the nanoscale. The installation of a Full-field TXM station will extend the current microtomographic capabilities of the Diamond-Manchester I13 Imaging Branchline at Diamond Light Source (UK) into the sub-100 nm spatial resolution range using photon energies from 8 to 14 keV. The dedicated Full-field TXM station will be built in-house with contributions of Diamond Light Source support divisions and via collaboration with the X-ray Optics Group of Paul Scherrer Institut (Switzerland) which will develop state-of-the-art diffractive X-ray optical elements. Preliminary results of the I13 Full-field TXM station are shown. The Full-field TXM will become an important Diamond Light Source direct imaging asset for material science, energy science and biology at the nanoscale.	Jan 2016
I13-2-Diamond Manchester Imaging	Full-field TXM at Diamond-Manchester I13 Beamline J. Vila-comamala , J. Bosgra , D. S. Eastwood , U. H. Wagner , A. J. Bodey , M. Garcia-fernandez , C. David , C. Rau International Conference on X-ray Microscopy 2014 Diamond Proposal Number(s): [11004] Open Access Show Abstract ▼ Abstract: To date, full-field Transmission X-ray Microscopy (TXM) has shown to be a powerful method for obtaining quantitative internal structural and chemical information from materials at the nanoscale. The installation of a full-field TXM station will extend the current microtomographic capabilities of the Diamond-Manchester BL-I13 Beamline Imaging Branch at Diamond Light Source (UK) into the sub-100 nm spatial resolution range using photon energies from 8 to 15 keV. Preliminary full-field TXM experiments demonstrate a spatial resolution of about 50 nm in both transmission and Zernike phase contrast [3] modes at 8.3 keV photon energy, figure (a) to (c). The tomographic capabilities using Zernike phase contrast, figure (d) and (e), were tested using a Nickel particle from a solid oxide fuel cell (courtesy of R. Bradley, University of Manchester) and the fibres of a coir-based supercapacitor material (courtesy of C. P. Grey and N. Trease, University of Cambridge). The dedicated full-field TXM station will be b ilt in-house with the contributions of Diamond Light Source support divisions and in collaboration of the X- ray Optics Group of the Paul Scherrer Institut (Switzerland) developing state-of-the-art diffractive X-ray optical elements. The full-field TXM will become an important direct imaging asset for material science, energy science and biology at the nanoscale at the Diamond Light Source.	Oct 2014

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