Open AccessPolycapillary-boosted instrument performance in the extreme ultraviolet regime for inverse photoemission spectroscopy
Author(s) -
Christoph Braig,
Andréy Sokolov,
Regan G. Wilks,
Xeniya Kozina,
Thomas Kunze,
S. Bjeoumikhova,
Markus Thiel,
Alexei Erko,
Marcus Bär
Publication year - 2017
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.25.031840
Subject(s) - optics , spectrometer , collimated light , extreme ultraviolet , resolution (logic) , spectroscopy , lens (geology) , wavelength , ultraviolet , physics , photon energy , materials science , photon , laser , quantum mechanics , artificial intelligence , computer science
A collimating polycapillary half lens, traditionally used in the medium and hard X-ray band, is operated at a photon energy of 36 eV for the first time. While the transmission still exceeds 50%, the measured and simulated spatial resolution and angular divergence approach 0.4 mm or less and at most 20 mrad, respectively. This unexpected, superior performance of the polycapillary optic in the extreme Ultraviolet could enable the design of an efficient, versatile and compact spectrometer for inverse photoemission spectroscopy (IPES): Its wavelength-dispersive component, a customized reflection zone plate, can maintain an energy resolution of 0.3 eV, whereas the sensitivity may be enhanced by more than one order of magnitude, compared to conventional spectrometers. Furthermore, the overall length of 0.9 m would allow for an eased alignment and evacuation. We see a significant potential for numerous polycapillary-based XUV / soft X-ray instruments in the future, in particular after further optimization for this long wavelength regime.