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Zone plates for angle-resolved photoelectron spectroscopy providing sub-micrometre resolution in the extreme ultraviolet regime

DOI: 10.1107/S1600577519000869 DOI Help

Authors: Benedikt Rösner (Paul Scherrer Institut) , Pavel Dudin (Diamond Light Source) , Jeroen Bosgra (Paul Scherrer Institute) , Moritz Hoesch (Diamond Light Source; Deutsches Elektronen Synchrotron (DESY)) , Christian David (Paul Scherrer Institut)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Synchrotron Radiation , VOL 26

State: Published (Approved)
Published: March 2019
Diamond Proposal Number(s): 16764 , 14488

Open Access Open Access

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.

Journal Keywords: angle-resolved photoelectron spectroscopy (ARPES); Fresnel zone plates; microspectroscopy; nanofocus

Subject Areas: Technique Development, Physics


Instruments: I05-ARPES

Documents:
ve5093.pdf