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our research
SoftwareX Volume 21, February 2023, 101269
PyfastSPM: A Python package to convert 1D FastSPM data streams into publication quality movies
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Since the invention of scanning probe microscopy, researchers have desired to use this technique to monitor sub-second surface dynamics with atomic spatial resolution. A recently presented add-on electronics module enables the speed-up of existing, conventional scanning probe microscopes without any modification of the actual instrument. The resulting one-dimensional (1D) data stream, recorded while the tip oscillates in a sinusoidal motion, has to be reconstructed into a layered rectangular matrix in order to visualize the movie. The Python-based pyfastspm package performs this conversion, while also correcting for sample tilt, noise frequencies, piezo creep, and thermal drift. Quick automatic conversion even of considerable batches of data is achieved by efficient algorithms that bundle time-expensive steps, such as interpolation based on Delaunay triangulation.(c) 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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from our users
Nanoscale, 2023, Advance Article
Probing dynamic covalent chemistry in a 2D boroxine framework by in situ near-ambient pressure X-ray photoelectron spectroscopy
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Dynamic covalent chemistry is a powerful approach to design covalent organic frameworks, where high crystallinity is achieved through reversible bond formation. Here, we exploit near-ambient pressure X-ray photoelectron spectroscopy to elucidate the reversible formation of a two-dimensional boroxine framework. By in situ mapping the pressure-temperature parameter space, we identify the regions where the rates of the condensation and hydrolysis reactions become dominant, being the key to enable the thermodynamically controlled growth of crystalline frameworks.
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our research
Sci Rep 12, 19769 (2022)
Highly ordered laser imprinted plasmonic metasurfaces for polarization sensitive perfect absorption
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We present polarization-sensitive gap surface plasmon metasurfaces fabricated with direct material processing using pulsed laser light, an alternative and versatile approach. In particular we imprint laser induced periodic surface structures on nanometer-thick Ni films, which are back-plated by a grounded dielectric layer with TiO2 and ZnO deposition followed by Au evaporation. The procedure results in a metal-insulator-metal type plasmonic metasurface with a corrugated top layer consisting of highly-ordered, sinusoidal shaped, periodic, thin, metallic nanowires. The metasurface sustains sharp, resonant gap surface plasmons and provides various opportunities for polarization control in reflection, which is here switched by the size and infiltrating material of the insulating cavity. The polarization control is associated with the polarization sensitive perfect absorption and leads to high extinction ratios in the near-IR and mid-IR spectral areas. Corresponding Fourier-transform infrared spectroscopy measurements experimentally demonstrate that the fabrication approach produces metasurfaces with very well-defined, controllable, sharp resonances and polarization sensitive resonant absorption response which, depending on the insulating cavity size, impacts either the normal or the parallel to the nanowires polarization.
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Deliverables view all
WP12 - JA2 - X-ray Wavefront Metrology, Correction and Manipulation
D12.2 - Prototype of corrected CRL nanofocusing unit for user experiments
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Compound refractive lenses (CRLs) are widely used at synchrotron radiation facilities for X-ray beam shaping [1, 2] and focusing [3]. They are made by pressing a parabolic lens profile into a thin foil of aluminum or beryllium via a coining process. Their focusing capability depends on the manufacturing quality of the stamp and mechanical alignment during the coining process, both of which are limited by today’s technology [4]. Recently, diamond CRLs made by laser ablation and mechanical polishing emerged, which exhibit similar shape errors [5]. It has been shown that each lens shows a typical shape deviation of 500 nm from an ideal paraboloid of rotation [3]. When many of these lenses are stacked in order to create sub-micrometer X-ray beams, these shape errors add up and lead to spherical aberration, impacting the resolution and imaging capabilities of X-ray microscopes. A solution to overcome these challenges is the correction of aberration by an additional optical element, called a refractive phase plate [6]. It is tailor-made for the specific lens configuration and needs to be aligned with respect to the optical axis to within a few micrometers, requiring a motorization within a plane perpendicular to the optical axis. Here, we present the development of a new CRL lens holder with an integrated mechanism to align a phase plate and keep the aligned position over time and in between experimental campaigns in order to enable usability by non-expert users and to provide aberration-corrected nanobeams with CRLs within the NFFA catalogue for end users.
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WP1 - MGT1 - Project Management
D1.4 - First gender report
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Under Horizon 2020 gender is a cross-cutting issue and 3 objectives underpin the strategy on gender equality: 1. Fostering gender balance in research teams, in order to close the gaps in the participation of women. 2. Ensuring gender balance in decision-making, in order to reach the target of 40% of the under-represented sex in panels and groups and of 50% in advisory groups. 3. Integrating the gender dimension in research and innovation (R&I) content. In Horizon 2020 funded projects grant beneficiaries commit themselves to promoting equal opportunities and a balanced participation of women and men at all levels in research and innovation teams and in management structures. Moreover, gender balance is a feature of H2020 projects evaluated under Impact. This document aims at having a detailed snapshot of NEP performances about gender in the first 18 months from the beginning of the project, also in comparison with the numbers presented in SHE FIGURES 2021 (https://ec.europa.eu/assets/rtd/shefigures2021/index.html), and at identifying actions to pursue to better address gender issues outlined in NEP proposals.
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WP11 - JA1 - Real-time observation and control in microscopy and spectroscopy of nanoobjects
D11.2 - Pilot experiment carried out in collaboration with a FEL user facility
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The recent development of Free Electron Lasers (FELs) opens the way for pump-probe experiments in the extreme ultra violet (EUV) and X-Rays regime. In particular, seeded FELs are the best candidates for experiments in which high wavelength purity and power stability is required, such as coherent non-linear experiments. In this case, the fine control of photon energy and polarization is the key for accessing the dynamics of core level electrons in solid state systems, thanks to the species selectivity given by the variable photon energy of FEL pulses.
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Transnational Access Statistics
19 calls for access
646 proposals submitted
63% rate of acceptance
31% with Large Scale Facilities
13% with theory
12% with industry
~3 average users per proposal
58 countries applying
1924 lab sessions