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Sampling moiré method: a tool for sensing quadratic phase distortion and its correction for accurate quantitative phase microscopy
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-03-24)
The advantages of quantitative phase microscopy (QPM) such as label-free imaging with high spatial sensitivity, live cell compatibility and high-speed imaging makes it viable for various biological applications. The measurement accuracy of QPM strongly relies on the shape of the recorded interferograms, whether straight or curved fringes are recorded during the data acquisition. Moreover, for a ...
Superresolving the kidney – a practical comparison of fluorescence nanoscopy of the glomerular filtration barrier
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-12-05)
Immunofluorescence microscopy is routinely used in the diagnosis of and research on renal impairments. However, this highly specific technique is restricted in its maximum resolution to about 250 nm in the lateral and 700 nm in the axial directions and thus not sufficient to investigate the fine subcellular structure of the kidney’s glomerular filtration barrier. In contrast, electron microscopy ...
Integrated nanophotonic waveguide-based devices for IR and Raman gas spectroscopy
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-10-30)
On-chip devices for absorption spectroscopy and Raman spectroscopy have been developing rapidly in the last few years, triggered by the growing availability of compact and affordable tunable lasers, detectors, and on-chip spectrometers. Material processing that is compatible with mass production has been proven to be capable of long low-loss waveguides of sophisticated designs, which are indispensable ...
Dust sputtering within the inner heliosphere: a modelling study
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-08-03)
The aim of this study is to investigate how sputtering by impacting solar wind particles influence the lifetime of dust particles in the inner heliosphere near the Sun.<p><p>
We consider three typical dust materials: silicate, Fe<sub>0.4</sub>Mg<sub>0.6</sub>O and carbon and describe their sputtering yields based on atomic yields given by the Stopping and Range of Ions in Matter (SRIM) package. ...
Conditions for Topside Ion Line Enhancements
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-06-17)
Enhanced ion line spectra as a response to magnetic field-aligned high frequency (HF)
pumping of the overdense polar ionosphere with left-handed circular polarization, can be observed at
the top and bottomside F-region ionosphere under certain conditions. The European Incoherent Scatter
(EISCAT) UHF radar was directed in magnetic zenith on October 18th and 19th, 2017 while stepping the
pump ...
Spectral shaping of ring resonator transmission response
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021)
We present a Mach-Zehnder interferometer assisted ring resonator configuration (MARC) to realize resonator transmission spectra with unique spectral signatures and significantly large effective free spectral ranges. Transmission spectra with unique spectral signatures are generated by changing the angular separation between the through port and the drop port waveguides of the ring resonator (RR). ...
Planetary radar science case for EISCAT 3D
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-05-12)
Ground-based inverse synthetic aperture radar is
a tool that can provide insights into the early history and
formative processes of planetary bodies in the inner solar
system. This information is gathered by measuring the scattering matrix of the target body, providing composite information about the physical structure and chemical makeup
of its surface and subsurface down to the penetration ...
Single-shot fringe pattern phase retrieval using improved period-guided bidimensional empirical mode decomposition and Hilbert transform
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-09-17)
Fringe pattern analysis is the central aspect of numerous optical measurement methods, e.g., interferometry, fringe projection, digital holography, quantitative phase microscopy. Experimental fringe patterns always contain significant features originating from fluctuating environment, optical system and illumination quality, and the sample itself that severely affect analysis outcome. Before the ...
Fisheries acoustics and Acoustic Target Classification - Report from the COGMAR/CRIMAC workshop on machine learning methods in fisheries acoustics
(Research report; Forskningsrapport, 2021-06-15)
This report documents a workshop organised by the COGMAR and CRIMAC projects. The objective of the workshop was twofold. The first objective was to give an overview of ongoing work using machine learning for Acoustic Target Classification (ATC). Machine learning methods, and in particular deep learning models, are currently being used across a range of different fields, including ATC. The objective ...
Electron Bulk Heating at Saturn’s Magnetopause
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-03-25)
Magnetic reconnection at the magnetopause (MP) energizes ambient plasma via the release of magnetic energy and produces an “open” magnetosphere allowing solar wind particles to directly enter the system. At Saturn, the nature of MP reconnection remains unclear. The current study examines electron bulk heating at MP crossings, in order to probe the relationship between observed and predicted reconnection ...