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Main Title: Experimental evaluation of signal-to-noise in spectro-holography via modified uniformly redundant arrays in the soft x-ray and extreme ultraviolet spectral regime
Author(s): Günther, Christian M.
Guehrs, Erik
Schneider, Michael
Pfau, Bastian
Korff Schmising, Clemens von
Geilhufe, Jan
Schaffert, Stefan
Eisebitt, Stefan
Type: Article
Language Code: en
Abstract: We present dichroic x-ray lensless magnetic imaging by Fourier transform holography with an extended reference scheme via a modified uniformly redundant array (mURA). Holographic images of magnetic domains simultaneously generated by a single pinhole reference as well as by a mURA reference are compared with respect to the signal-to-noise ratio (SNR) as a function of exposure time. We apply this approach for spectro-holographic imaging of ferromagnetic domain patterns in Co/Pt multilayer films. Soft x-rays with wavelengths of 1.59 nm (Co L 3 absorption edge) and 20.8 nm (Co M 2,3 absorption edges) are used for image formation and to generate contrast via x-ray magnetic circular dichroism. For a given exposure time, the mURA-based holography allows to decouple the reconstruction SNR from the spatial resolution. For 1.59 nm wavelength, the reconstruction via the extended reference scheme shows no significant loss of spatial resolution compared to the single pinhole reference. In contrast, at 20.8 nm wavelength the single pinhole reveals some very intricate features which are lost in the image generated by the mURA, although overall a high-quality image is generated. The SNR-advantage of the mURA scheme is most notable when the hologram has to be encoded with few photons, while errors associated with the increased complexity of the reconstruction process reduce the advantage for high-photon-number experiments.
Issue Date: 2017
Date Available: 20-May-2020
DDC Class: 530 Physik
Subject(s): magnetic circular dichroism
imaging and optical processing
diffraction efficiency
resolution and other hologram characteristics
magnetic domains in thin films
Sponsor/Funder: BMBF, 05K13KT3, Verbundprojekt 05K2013 - DynaMaX: Messplatz für ultraschnelle Dynamik bei BESSY II. Teilprojekt 1
Journal Title: Journal of Optics
Publisher: IOP Publishing
Publisher Place: Bristol
Volume: 19
Issue: 6
Article Number: 64002
Publisher DOI: 10.1088/2040-8986/aa6380
EISSN: 2040-8986
ISSN: 2040-8978
Appears in Collections:FG Röntgenoptik und Nanometer-Optik » Publications

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