A5000846522- Metamaterials and Metasurfaces Applications
- Plasmonic and Surface Plasmon Research
- Advanced Antenna and Metasurface Technologies
- Photonic Crystals and Applications
- Mass Spectrometry Techniques and Applications
- Advanced Proteomics Techniques and Applications
- Analytical Chemistry and Chromatography
- Ion-surface interactions and analysis
- Antenna Design and Analysis
- Photonic and Optical Devices
- Orbital Angular Momentum in Optics
- Advanced MEMS and NEMS Technologies
- Advanced Thermoelectric Materials and Devices
- Optical Coatings and Gratings
- Quasicrystal Structures and Properties
- Metabolomics and Mass Spectrometry Studies
- Mechanical and Optical Resonators
- Electromagnetic Scattering and Analysis
- Quantum optics and atomic interactions
- Diamond and Carbon-based Materials Research
- Advanced Thermodynamics and Statistical Mechanics
- Radio Wave Propagation Studies
- Near-Field Optical Microscopy
- Gold and Silver Nanoparticles Synthesis and Applications
- Analytical chemistry methods development
Merck (Germany)
2025
Klinikum rechts der Isar
2014-2017
Technical University of Munich
2014-2017
Friedrich Schiller University Jena
2008-2016
Technische Universität Berlin
2016
Schiller International University
2015
Qiagen (Germany)
2007-2010
Harvard University
2010
Ludwig-Maximilians-Universität München
2009
PXBioVisioN (Germany)
2005-2007
We experimentally demonstrate a three-dimensional chiral optical metamaterial that exhibits an asymmetric transmission for forwardly and backwardly propagating linearly polarized light. The observation of this novel effect requires composed metaatoms without any rotational symmetry. Our analysis is supported by systematic investigation the matrices arbitrarily complex, lossy media allows deriving simple criterion in arbitrary polarization base. Contrary to physical intuition, general...
By relying on an advanced Jones calculus, we analyze the polarization properties of light upon propagation through metamaterial slabs in a comprehensive manner. Based symmetry considerations, show that all periodic metamaterials may be divided into five different classes only. It is shown each class differently affects transmitted and sustains eigenmodes. We how to deduce these from considerations provide simple algorithm can applied decide which given belongs by measuring only intensities.
Single-photon ionization of ${\mathrm{C}}_{60}$ and ${\mathrm{C}}_{70}$ has been studied using synchrotron radiation in an energy range from the potential (7.54\ifmmode\pm\else\textpm\fi{}0.04 eV for 7.3\ifmmode\pm\else\textpm\fi{}0.2 ${\mathrm{C}}_{70}$) up to 35 eV. The photoion yield is dominated by a strong resonance at about 20 with FWHM \ensuremath{\sim}10 We interpret this as being due autoionization via giant plasmon recently predicted RPA approximation. offer unique possibility...
We show for the first time that a planar metamaterial, an array of coupled metal split-ring resonators with unit cell lacking mirror symmetry, exhibits asymmetric transmission terahertz radiation (0.25-2.5 THz) propagating through it in opposite directions. This intriguing effect, is compatible Lorentz reciprocity and time-reversal, depends on directional difference conversion efficiency incident circularly polarized wave into one handedness, only possible lossy low-symmetry chiral...
The human Plasma Proteome Project pilot phase aims to analyze serum and plasma specimens elucidate specimen characteristics by various proteomic techniques ensure sufficient sample quality for the HUPO main phase. We used our proprietary peptidomics technologies samples distributed HUPO. Peptidomics summarizes visualization, quantitation, identification of low-molecular-weight proteome (<15 kDa), "peptidome." analyzed all four (EDTA plasma, citrate heparin serum) from African- Asian-American...
We introduce a technique to retrieve effective metamaterial parameters for arbitrary angles of incidence. It employs the complex reflection and/or transmission coefficients finite slab. Explicit expressions both polarizations are derived and constraints be met obtaining unique solutions discussed. The method is applied fishnet structure. turns out that all retrieved strongly depend on lateral wave vector component due complexity Thus, these mere rather than global material parameters....
We introduce a top-down fabricated metamaterial composed of three-dimensional, chiral, plasmonic nanostructures for visible and near-infrared wavelengths. Based on combined spectroscopic interferometric characterization, the entire complex transmission response in terms Jones matrix is disclosed. Particularly, polarization output state light after propagation through can be decoded from measurements any excitation configuration. experimentally found rotation azimuth linearly polarized...
Although optical metamaterials that show artificial magnetism are mesoscopic systems, they frequently described in terms of effective material parameters. But due to intrinsic nonlocal (or spatially dispersive) effects it may be anticipated this approach is usually only a crude approximation and physically meaningless. In order study the limitations regarding assignment parameters, we present technique retrieve frequency-dependent elements permittivity permeability tensors for arbitrary...
The accuracy of intraductal ultrasonography (IDUS) and endoscopic (EUS) were compared in diagnosing biliary obstruction predicting surgical resectability.Fifty-six patients with investigated preoperatively both conventional EUS IDUS. ultrasonographic miniprobe was inserted into the bile duct system through working channel duodenoscope during retrograde cholangiopancreatography (ERCP). Conventional endosonography performed echoendoscopes a standard technique. Images endoluminal prospectively...
Quantitative or comparative proteome analysis was initially performed with 2-dimensional gel electrophoresis the inherent disadvantages of being biased towards certain proteins and labor intensive. Alternative mass spectrometry-based approaches in conjunction gel-free protein/peptide separation have been developed recent years using various stable isotope labeling techniques. Common to all these techniques is incorporation, biosynthetically chemically, a moiety having either natural...
An analytical description for plane-wave propagation in metamaterials is presented. It follows the usual approach describing light homogeneous media on basis of Maxwell's equations, although applied to a medium composed metallic nanostructures. Here, as an example, these nanostructures are double (or cut) wires. In present it assumed that carriers perform collective oscillations single wire. These coupled those adjacent wire; thus, internal carrier dynamics may be described by...
We experimentally and numerically study the propagation of light through amorphous metamaterials. For this purpose we introduce a precisely controllable degree positional disorder into perfectly periodic system, transforming it to partially disordered ultimately an metamaterial. The observable spectral features occurring upon transition impact coherent interactions among neighboring unit cells are revealed. Backed by numerical simulations, effective properties metamaterials retrieved, most...
The performance characteristics of two lasers emitting in the mid infrared, an Er-YAG (2.94 μm wavelength, 80–90 ns pulse width), and Er-YSGG infrared laser (2.79 80 matrix-assisted desorption/ionization mass spectrometry (IR-MALDI-MS) biological macromolecules, is reported. Glycerol succinic acid were used as matrices. In IR-MALDI sample consumption per shot typically exceeds that UV-MALDI by about orders magnitude. Using glycerol matrix, reproducibility ion signals from to comparable best...
Human blood plasma is a useful source of proteins associated with both health and disease. Analysis human challenge due to the large number peptides present very wide range concentrations. In order identify as many possible for subsequent comparative studies, we developed an industrial-scale (2.5 liter) approach involving sample pooling analysis smaller (M(r) generally < ca. 40 000 some fragments proteins). Plasma from healthy males was depleted abundant (albumin IgG), then polypeptides were...
We report on the experimental and theoretical study of resonant eigenmodes spiral-type terahertz antennas. The analysis is carried out for a varying number spiral windings. For larger numbers structure possesses self-complementary property which allows application Mushiake principle predicting that impedance such structures half free space. This permits to observe an equal frequency independent reflection transmission coefficient. makes antenna not only fascinating example medium supporting...
The properties of several cinnamic acid compounds used as matrices for matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF MS) were investigated standard dried droplet (DD) and vacuum sublimed preparations. differences between both preparation methods analyzed with regard to matrix grain size, internal ion energy, initial velocity, analyte intensity, incorporation depth. Some the derivatives exhibit clearly reduced sizes preparations compared DD...
A metal–insulator–metal (MIM) waveguide is a canonical structure used in many functional plasmonic devices. Recently, research on nanoresonantors made from finite, that is, truncated, MIM waveguides attracted considerable deal of interest motivated by the promise for applications. However, most suggested nanoresonators do not reach deep-subwavelength domain. With ordinary fabrication techniques dielectric spacers usually remain fairly thick, order tens nanometers. This prevents wavevector...
Metamaterials consist of a periodic or aperiodic arrangement so-called meta-atoms. Usually their optical properties are derived from the collective response this ensemble. However, it is highly desirable to deduce them scattering individual meta-atoms because frequently has spurious effect on desired functionality. Moreover, understanding permits introducing guidelines for design and predicting effective amorphous metamaterials. To achieve we introduce genuine approach quantify end evaluate...
By means of experiment and simulation, we achieve unprecedented insights into the formation Talbot images to be observed in transmission for light diffracted at wavelength-scale amplitude gratings.Emphasis is put on disclosing impact interplay various diffraction orders images.They can manipulated by selective filtering Fourier plane.Experiments are performed with a high-resolution interference microscope that measures phase fields real-space.Simulations have been using rigorous...
Recently perfect metamaterial absorbers triggered some fascination since they permit the observation of an extreme interaction light with a nanostructured thin film. For first time we evaluate here functionality such if are applied on curved surfaces. We probe their optical response and discuss potential novel applications. Examples complete suppression back-scattered from covered objects, rendering it cloaked in reflection, action as black holes.