A5028611069- Plasmonic and Surface Plasmon Research
- Gold and Silver Nanoparticles Synthesis and Applications
- Ion-surface interactions and analysis
- Semiconductor materials and devices
- Electron and X-Ray Spectroscopy Techniques
- Nanowire Synthesis and Applications
- Metamaterials and Metasurfaces Applications
- GaN-based semiconductor devices and materials
- Graphene research and applications
- Metal and Thin Film Mechanics
- Force Microscopy Techniques and Applications
- Near-Field Optical Microscopy
- Surface and Thin Film Phenomena
- Advanced Electron Microscopy Techniques and Applications
- Advanced biosensing and bioanalysis techniques
- Integrated Circuits and Semiconductor Failure Analysis
- Advancements in Semiconductor Devices and Circuit Design
- Magnetic properties of thin films
- Semiconductor materials and interfaces
- Photonic and Optical Devices
- Optical Coatings and Gratings
- Transition Metal Oxide Nanomaterials
- X-ray Spectroscopy and Fluorescence Analysis
- Orbital Angular Momentum in Optics
- Quantum and electron transport phenomena
Brno University of Technology
2016-2025
Central European Institute of Technology
2016-2025
Brigham Young University
2021-2023
ShanghaiTech University
2022
Institute of Physical Chemistry
2015-2018
Central European Institute of Technology
2017
Czech Academy of Sciences, Institute of Scientific Instruments
2009
Laboratoire de Chimie
2004
Czech Academy of Sciences, Institute of Physics
1997
We present a comparative study of plasmonic antennas fabricated by electron beam lithography and direct focused ion milling. have investigated optical structural properties chemical composition gold disc-shaped on silicon nitride membrane both methods to identify their advantages disadvantages. Plasmonic were characterized using transmission microscopy including energy loss spectroscopy dispersive X-ray spectroscopy, atomic force microscopy. found stronger response with better field...
Abstract Recent years have seen a growing interest in strong coupling between plasmons and excitons, as way to generate new quantum optical testbeds influence chemical dynamics reactivity. Strong bright plasmonic modes has been achieved even with single emitters. Dark fare better some applications due longer lifetimes, but are difficult probe they subradiant. Here, we apply electron energy loss (EEL) spectroscopy demonstrate that dark mode of an individual bowtie can interact small number...
Due to significant advances in instrumentation, many previously specialized techniques have become “routine” user facilities. However, detailed knowledge held by experts has often not been relayed general users, so they rely on entry-level information, basic principles, and comparison with literature results for data analysis. As a result, major errors the analysis of multiple surface material techniques, including x-ray photoelectron spectroscopy (XPS), appearing scientific literature....
Vanadium dioxide (VO2) has received significant interest in the context of nanophotonic metamaterials and memories owing to its reversible insulator–metal transition associated with changes optical electronic properties. The phase VO2 been extensively studied for several decades, ways how control hysteresis characteristics relevant memory applications have significantly improved. However, dynamics stability coexisting phases during not on level individual single-crystal nanoparticles (NPs),...
Abstract Local probing of dynamic excitations such as magnons and phonons in materials nanostructures can bring new insights into their properties functionalities. For example, magnonics, many concepts devices recently demonstrated at the macro- microscale now need to be realized nanoscale. Brillouin light scattering (BLS) spectroscopy microscopy has become a standard technique for spin wave characterization, enabled pioneering magnonic experiments. However, conventional BLS cannot detect...
Abstract Constructing dual‐ion energy storage devices using anion‐intercalation graphite cathodes offers the unique opportunity to simultaneously achieve high density and output power density. However, a critical challenge remains in lack of proper anodes that match with cathodes, particularly sustainable electrolyte systems abundant potassium. Here, surface grafting approach utilizing multifunctional azobenzene sulfonic acid is reported, which transforms V 2 C MXene into high‐kinetics K +...
High resolution directed electron beam etching of hBN using water as the precursor gas.
Gallium is a plasmonic material offering ultraviolet to near-infrared tunability, facile and scalable preparation, good stability of nanoparticles. In this work, we experimentally demonstrate the link between shape size individual gallium nanoparticles their optical properties. To end, utilize scanning transmission electron microscopy combined with energy loss spectroscopy. Lens-shaped diameter 10 200 nm were grown directly on silicon nitride membrane using an effusion cell developed in...
Blue phosphorene, a two-dimensional, hexagonal-structured, semiconducting phosphorus, has gained attention as it is considered easier to synthesize on metal surfaces than its allotrope, black phosphorene. Recent studies report different structures of for example, Cu(111), but the underlying mechanisms their formation are not known. Here, using combination in situ ultrahigh vacuum low-energy electron microscopy and vacuo scanning tunneling microscopy, we determine time evolution surface...
ABSTRACT X‐ray photoelectron spectroscopy (XPS) and low energy ion scattering (LEIS) are important methods for identifying quantifying the elements at surfaces. XPS largely deals with zero‐loss peaks produced by unattenuated photoemission, focus of LEIS is similarly surface resulting from direct atoms. However, backgrounds these spectra also contain information. They can help reveal structures distributions atoms layers Here, we show abnormalities in that not accompanied photoemission or...
Inorganic halide perovskites have become attractive for many optoelectronic applications due to their outstanding properties. While chemical synthesis techniques been successful in producing high-quality perovskite crystals, scaling up wafer-scale thin films remains challenging. Vapor deposition methods, particularly physical vapor and deposition, emerged as potential solutions large-scale film fabrication. However, the control of phase purity during problematic. Here, we investigate...
The tailoring of electromagnetic near-field properties is the central task in field nanophotonics. In addition to 2D optics for optical nanocircuits, confined and enhanced electric fields are utilized detection sensing, photovoltaics, spatially localized spectroscopy (nanoimaging), as well nanolithography nanomanipulation. For practical purposes, it necessary develop easy-to-use methods controlling distribution. By imaging near-fields using a scanning microscope, we demonstrate that surface...
This article deals with the analysis of relationship between pull-off force measured by atomic microscopy and dimensions water bridge condensed a hydrophilic silicon oxide tip surface under ambient conditions. Our experiments have shown that increases linearly radius nonmonotonically relative humidity (RH). The latter dependence generally consists an initial constant part changing to convex–concave-like increase finally followed concave-like decrease this force. reproducibility tests...
Metasurfaces offer unparalleled functionalities for controlling the propagation and properties of electromagnetic waves. But to transfer these functions technological applications, it is critical render them tunable enable fast control by external stimuli. In most cases, this has been realized utilizing materials combined with a top-down nanostructuring process, which often complicated time intensive. Here we present novel strategy fabricating metasurface comprising epitaxially grown...
Optical metasurfaces have emerged as a new generation of building blocks for multifunctional optics. Design and realization metasurface elements place ever-increasing demands on accurate assessment phase alterations introduced by complex nanoantenna arrays, process referred to quantitative imaging. Despite considerable effort, the widefield (nonscanning) imaging that would approach resolution limits optical microscopy indicate response single still remains challenge. Here, we report strategy...
Abstract We present an experimental and theoretical study of Babinet’s principle complementarity in plasmonics. have used spatially-resolved electron energy loss spectroscopy cathodoluminescence to investigate electromagnetic response elementary plasmonic antenna: gold discs complementary disc-shaped apertures a layer. also calculated their the plane wave illumination. While qualitative validity has been confirmed, quantitative differences found related quality factor resonances magnitude...
We theoretically study plasmonic antennas featuring areas of extremely concentrated electric or magnetic field, known as hot spots. combine two types electric-magnetic complementarity to increase the degree freedom for design antennas: bowtie and diabolo duality Babinet's principle. evaluate figures merit different plasmon-enhanced optical spectroscopy methods trapping: field enhancement, decay rate quality factor plasmon resonances, trapping potential depth. The role principle in...
Synthesis of graphene by chemical vapor deposition is a promising route for manufacturing large-scale high-quality electronic applications. The quality the employed substrates plays crucial role, since surface roughness and defects alter growth cause difficulties in subsequent transfer. Here, we report on ultrasmooth high-purity copper foils prepared sputter Cu thin film SiO2/Si template, peeling off metallic layer from template. displays low level oxidation contamination, foil generally...
Low-energy ion scattering (LEIS) is known for its extreme surface sensitivity, as it yields a quantitative analysis of the outermost well highly resolved in-depth information ultrathin layers. Hence, could have been generally considered to be suitable technique graphene samples. However, due low cross section light elements such carbon, LEIS has not become common characterization graphene. In present study we use high-sensitivity instrument with parallel energy CVD transferred thermal...
Colloidal gold nanoparticles represent technological building blocks which are easy to fabricate while keeping full control of their shape and dimensions. Here, we report on a simple two-step maskless process assemble from water colloidal solution at specific sites silicon surface. First, the substrate covered by native oxide is exposed charged particle beam (ions or electrons) then immersed in HF-modified nanoparticles. The irradiation layer low-fluence causes changes type...