Number of found documents: 620
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Recent Trends in Charged Particle Optics and\nSurface Physics Instrumentation. Proceedings\nof the 16th International Seminar
Mika, Filip; Pokorná, Zuzana
2018 - English
Available at various institutes of the ASCR
Recent Trends in Charged Particle Optics and\nSurface Physics Instrumentation. Proceedings\nof the 16th International Seminar

Mika, Filip; Pokorná, Zuzana
Ústav přístrojové techniky, 2018

Very low energy electron transmission spectromicroscopy
Daniel, Benjamin; Radlička, Tomáš; Piňos, Jakub; Mikmeková, Šárka; Konvalina, Ivo; Frank, Luděk; Müllerová, Ilona
2018 - English
For more than 25 years, Scanning Low Energy Electron Microscopy (SLEEM) has been\ndeveloped at the Institute of Scientific Instruments (ISI), with several commercially available SEMs adapted with a cathode lens for SLEEM use, as well as a dedicated self-built UHV\nSLEEM setup.\nFor a better understanding of contrast formation at low energies, especially at very low\nenergies below 50 eV, where the local density of states plays an important role, more general\nknowledge about the interaction of (very) low energy electrons with solids is required. This\nwill be achieved using a newly developed ultra-high vacuum (UHV SLEEM) setup which\nincludes several enhancements compared to other available machines. Data processing is\npresented in, and processed data will be further used and tested with the Monte Carlo\nsimulation package BRUCE, which is being developed by Werner et al. at TU Vienna. Available at various institutes of the ASCR
Very low energy electron transmission spectromicroscopy

For more than 25 years, Scanning Low Energy Electron Microscopy (SLEEM) has been\ndeveloped at the Institute of Scientific Instruments (ISI), with several commercially available SEMs adapted with a ...

Daniel, Benjamin; Radlička, Tomáš; Piňos, Jakub; Mikmeková, Šárka; Konvalina, Ivo; Frank, Luděk; Müllerová, Ilona
Ústav přístrojové techniky, 2018

Hiding e-beam exposure fields by deterministic 2D pattering
Horáček, Miroslav; Knápek, Alexandr; Matějka, Milan; Krátký, Stanislav; Urbánek, M.; Mika, Filip; Kolařík, Vladimír
2018 - English
The high stability and good current homogeneity in the spot of the e-beam writer is crucial to\nthe exposure quality, particularly in the case of large-area structures when gray-scale\nlithography is used. Even though the deflection field distortion is calibrated regularly and\nbeam focus and beam astigmatism is dynamically corrected over the entire deflection field, we can observe disturbances in the exposed relief.\nRecently, we presented a method that makes use of e–beam exposure imperfection by\nintroducing marginally visible high–frequency diffraction gratings of variable pitch that fill in\nseparate orthogonal exposure fields. The actually presented approach follows up our\nresearch on aperiodic arrangements of optical primitives, especially on the phyllotactic–\nlike arrangement of sub–micron relief optical elements. This approach is extended from the\ndiffraction element arrangement to the higher level of exposure fields arrangements. Keywords: phyllotaxis; electron beam lithography Available at various institutes of the ASCR
Hiding e-beam exposure fields by deterministic 2D pattering

The high stability and good current homogeneity in the spot of the e-beam writer is crucial to\nthe exposure quality, particularly in the case of large-area structures when gray-scale\nlithography is ...

Horáček, Miroslav; Knápek, Alexandr; Matějka, Milan; Krátký, Stanislav; Urbánek, M.; Mika, Filip; Kolařík, Vladimír
Ústav přístrojové techniky, 2018

STEM modes in SEM
Konvalina, Ivo; Paták, Aleš; Mikmeková, Eliška; Mika, Filip; Müllerová, Ilona
2018 - English
The segmented semiconductor STEM detector in the Magellan 400 FEG SEM microscope\n(https://www.fei.com/) is used to detect transmitted electrons (TEs) and allows observing\nsamples in four imaging modes. Two modes of objective lens, namely high resolution (HR)\nand ultra-high resolution (UHR), differ by their resolution and by the presence or absence of\na magnetic field around the sample. If the beam deceleration (BD) mode is chosen, then\nan electrostatic field around the sample is added and two further microscope modes HR + BD\nand UHR + BD, become available. Trajectories of TEs are studied with regard to their angular\nand energy distribution in each mode in this work.\n Available at various institutes of the ASCR
STEM modes in SEM

The segmented semiconductor STEM detector in the Magellan 400 FEG SEM microscope\n(https://www.fei.com/) is used to detect transmitted electrons (TEs) and allows observing\nsamples in four imaging ...

Konvalina, Ivo; Paták, Aleš; Mikmeková, Eliška; Mika, Filip; Müllerová, Ilona
Ústav přístrojové techniky, 2018

Creation of electron vortex beams using the holographic reconstruction method in a scanning electron microscope
Řiháček, Tomáš; Horák, M.; Schachinger, T.; Matějka, Milan; Mika, Filip; Müllerová, Ilona
2018 - English
Electron vortex beams (EVB) were theoretically predicted in 2007 and first experimentally\ncreated in 2010. Although they attracted attention of many researchers, their\ninvestigation takes place almost solely in connection with transmission electron microscopes (TEM). On the other hand, although scanning electron microscopes (SEM) may provide some advantages for EVB applications, only little attention has been dedicated to them. Therefore, the aim of this work is to create electron vortices in SEM at energies of several keV. Available at various institutes of the ASCR
Creation of electron vortex beams using the holographic reconstruction method in a scanning electron microscope

Electron vortex beams (EVB) were theoretically predicted in 2007 and first experimentally\ncreated in 2010. Although they attracted attention of many researchers, their\ninvestigation takes place ...

Řiháček, Tomáš; Horák, M.; Schachinger, T.; Matějka, Milan; Mika, Filip; Müllerová, Ilona
Ústav přístrojové techniky, 2018

Locking in on large volume light-sheet microscopy
Vettenburg, T.; Dalgarno, H.I.C.; Nylk, J.; Coll-Lladó, C.; Ferrier, D.E.K.; Čižmár, Tomáš; Gunn-Moore, F.J.; Dholakia, K.; Corral, A.; Rodriguez-Pulido, A.; Flors, C.; Ripoll, J.
2018 - English
Fluorescence light-sheet microscopy is increasingly adopted by developmental biologists to study how cells divide and differentiate to form organs and even entire organisms. The lightsheet microscope differs from a conventional microscope in that the specimen is illuminated\nby a plane of light orthogonal to the detection axis, thus keeping the out-of-focus areas dark\nwhile minimizing any potentially detrimental exposure of the sample. The light-sheet\nmicroscope has been found to be the ideal instrument for long-term and non-invasive studies of intact, and therefore three-dimensional, fluorescent samples. Available at various institutes of the ASCR
Locking in on large volume light-sheet microscopy

Fluorescence light-sheet microscopy is increasingly adopted by developmental biologists to study how cells divide and differentiate to form organs and even entire organisms. The lightsheet microscope ...

Vettenburg, T.; Dalgarno, H.I.C.; Nylk, J.; Coll-Lladó, C.; Ferrier, D.E.K.; Čižmár, Tomáš; Gunn-Moore, F.J.; Dholakia, K.; Corral, A.; Rodriguez-Pulido, A.; Flors, C.; Ripoll, J.
Ústav přístrojové techniky, 2018

Structure investigation of hydrogels using a cryo-SEM
Adámková, Kateřina; Hrubanová, Kamila; Samek, Ota; Trudičová, M.; Sedláček, P.; Krzyžánek, Vladislav
2018 - English
Hydrogels can be characterized as elastic hydrophilic polymer chains connected in network\nwhich are able to swell notably when exposed to aqueous media by absorbing considerable\namounts of water. Besides being a constituent of living organisms, nowadays, there are\nvarious fields hydrated polymers (e.g. polyvinyl alcohol, collagen, and starch) can be utilized\n– in both biological and non-biological form. Classic examples of such applications are\nhuman health and cosmetics (contact lenses, wound healing dressings and artificial\nreplacement tissues – skin, arterial grafts, cornea and spinal disc replacement), pharmacy\n(drug delivery systems), bioengineering, food industry, agriculture etc. Also, hydrogels\ncan reversibly change their shape when being exposed to a temperature change. Available at various institutes of the ASCR
Structure investigation of hydrogels using a cryo-SEM

Hydrogels can be characterized as elastic hydrophilic polymer chains connected in network\nwhich are able to swell notably when exposed to aqueous media by absorbing considerable\namounts of water. ...

Adámková, Kateřina; Hrubanová, Kamila; Samek, Ota; Trudičová, M.; Sedláček, P.; Krzyžánek, Vladislav
Ústav přístrojové techniky, 2018

Thermal desorption spectroscopy in prototype furnace for chemical vapor deposition
Průcha, Lukáš; Daniel, Benjamin; Piňos, Jakub; Mikmeková, Eliška
2018 - English
Cleaning of the sample surfaces is crucial for scanning electron microscopy, especially for\nlow energy electron microscopy or for the deposition of thin layers, such as graphene,\nwhere surface has to be well prepared. In the best case, every unwanted particle should be\ncleaned from the sample surface for best low energy electron microscopy observation or thin\nfilm deposition. Unfortunately, the standard cleaning procedures can leave residues on the\nsample surface. This work is focused on thermal desorption spectroscopy (TDS). TDS is a method of observing desorbed molecules from a sample surface during the increase of\ntemperature of the sample. The aim of this study was to determine optimum conditions:\ntemperature and time, to achieve clean surfaces in the shortest time. Available at various institutes of the ASCR
Thermal desorption spectroscopy in prototype furnace for chemical vapor deposition

Cleaning of the sample surfaces is crucial for scanning electron microscopy, especially for\nlow energy electron microscopy or for the deposition of thin layers, such as graphene,\nwhere surface has ...

Průcha, Lukáš; Daniel, Benjamin; Piňos, Jakub; Mikmeková, Eliška
Ústav přístrojové techniky, 2018

Inelastic mean free path from raw data measured by low-energy electrons time-of-flight spectrometer
Zouhar, Martin; Radlička, Tomáš; Oral, Martin; Konvalina, Ivo
2018 - English
The inelastic mean free path (IMFP) is a key parameter of electron transport in a solid. With\nthe rise of so-called meta-materials, materials of specific shape, such as 2D crystals, or\nmaterials with tailored functionality for next-generation electronic devices, the investigation\nof the IMFP is still topical and of high importance. This is true especially at low energies, landing energy of electrons below 100 eV, that are hard to study using well established\ntechniques of electron spectroscopy. Available at various institutes of the ASCR
Inelastic mean free path from raw data measured by low-energy electrons time-of-flight spectrometer

The inelastic mean free path (IMFP) is a key parameter of electron transport in a solid. With\nthe rise of so-called meta-materials, materials of specific shape, such as 2D crystals, or\nmaterials ...

Zouhar, Martin; Radlička, Tomáš; Oral, Martin; Konvalina, Ivo
Ústav přístrojové techniky, 2018

Electron optical properties of a new low-energy scanning electron microscope with beam separator
Radlička, Tomáš; Kolařík, V.; Oral, Martin
2018 - English
The low energy scanning electron microscope (SEM) which is currently at the Institute of\nScientific Instruments, suffers from low resolution and suboptimal detections systems. In the cathode lens regime, signal electrons are accelerated by the electric field between the sample and the objective lens, getting collimated. Those with low emission angles get through the bore in the BSE detector into the objective lens and cannot be detected by the available detectors now. The information about the sample provided by these electrons is lost,\nwhich limits our microscopy methods.\nThese two limitations are to be overcome with a new low-energy SEM, which was developed\nat Delong Instruments. It consists of a field emission gun with the energy width of 0.8 eV, a\nmagnetic condenser lens, and an electrostatic triode objective lens. The acceleration voltage is\n5 kV. The sample stage can be biased at up to -5 kV to provide low landing energy without\nstrong decrease of the resolution – the effect of the cathode lens. A beam separator is\nplaced in front of the deflection system for the detection of the signal electrons that get to the\ncolumn. In a combination with standard detectors and cathode lens, it allows detecting all\nkinds of signal electrons. Available at various institutes of the ASCR
Electron optical properties of a new low-energy scanning electron microscope with beam separator

The low energy scanning electron microscope (SEM) which is currently at the Institute of\nScientific Instruments, suffers from low resolution and suboptimal detections systems. In the cathode lens ...

Radlička, Tomáš; Kolařík, V.; Oral, Martin
Ústav přístrojové techniky, 2018

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