P. Schmitt
A5045044796- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Semiconductor materials and devices
- Particle Detector Development and Performance
- Neutrino Physics Research
- Astrophysics and Cosmic Phenomena
- Electronic and Structural Properties of Oxides
- Surface Roughness and Optical Measurements
- Particle Accelerators and Free-Electron Lasers
- Diamond and Carbon-based Materials Research
- Laser-induced spectroscopy and plasma
- ZnO doping and properties
- Dark Matter and Cosmic Phenomena
- Advanced Semiconductor Detectors and Materials
- Optical Coatings and Gratings
- Advanced NMR Techniques and Applications
- Black Holes and Theoretical Physics
- Medical Imaging Techniques and Applications
- Anodic Oxide Films and Nanostructures
- Copper Interconnects and Reliability
- Radiation Detection and Scintillator Technologies
- Gold and Silver Nanoparticles Synthesis and Applications
- Metal and Thin Film Mechanics
- Nanowire Synthesis and Applications
Friedrich Schiller University Jena
2020-2023
Fraunhofer Institute for Applied Optics and Precision Engineering
2020-2023
Bellingham Technical College
2016
Université de Haute-Alsace
2008
Institut Pluridisciplinaire Hubert Curien
2008
Centre National de la Recherche Scientifique
2008
Optica
1998
University of Würzburg
1987-1992
Harvard University Press
1987-1992
Istituto Nazionale di Fisica Nucleare, Sezione di Roma I
1989-1990
The reaction ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{e}^{+}{e}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}$ has been analyzed using 97 ${\mathrm{pb}}^{\ensuremath{-}1}$ of data taken with the Crystal Ball detector at DESY ${e}^{\ensuremath{-}}{e}^{+}$ storage ring DORIS II beam energies around 5.3 GeV. For first time we have measured cross section for $\ensuremath{\gamma}\ensuremath{\gamma}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}$...
We describe a cryogenic, high-resolution spectrograph (Phoenix) for the 1-5 micrometers region. Phoenix is an echelle of near-Littrow over-under configuration without cross dispersion. The foreoptics include Lyot re- imaging, discrete and circular variable order sorting filters, selection slits, optics post-slit imaging. entire instrument cooled to 50 K using two closed cycle coolers. detector Hughes-Santa Barbara 512 X 1024 InSb array. Resolution 65,000 has been obtained. Throughput slit...
Ultra-thin metallic films are widely applied in optics and microelectronics. However, their properties differ significantly from the bulk material depend on substrate material. The nucleation, film growth, layer of atomic deposited (ALD) iridium thin evaluated silicon wafers, BK7, fused silica, SiO2, TiO2, Ta2O5, Al2O3, HfO2, Ru, Cr, Mo, graphite to understand influence various materials. This comprehensive study was carried out using scanning electron force microscopy, X-ray reflectivity...
HfO 2 has promising applications in semiconductors and optics due to its high dielectric constant refractive index. In this work, thin films were deposited by plasma enhanced atomic layer deposition (PEALD) using tetrakis-dimethylamino hafnium (TDMAH) oxygen plasma. The process optimization obtain quality with excellent uniformity over a 200 mm diameter is thoroughly discussed. effects of temperature parameters on the structural, mechanical, optical properties, chemical composition...
The reaction \ensuremath{\gamma}\ensuremath{\gamma}\ensuremath{\rightarrow}${\ensuremath{\pi}}^{0}$\ensuremath{\eta} has been investigated with the Crystal Ball detector at DESY storage ring DORIS II. Formation of \ensuremath{\delta}(980) and ${A}_{2}$(1320) observed \ensuremath{\gamma}\ensuremath{\gamma} partial widths ${\ensuremath{\Gamma}}_{\ensuremath{\gamma}\ensuremath{\gamma}}$(${A}_{2}$)=1.14\ifmmode\pm\else\textpm\fi{}0.20\ifmmode\pm\else\textpm\fi{}0.2 6 keV...
The Crystal Ball detector has been used at the DORIS II storage ring DESY to study reaction ${\mathit{e}}^{+}$${\mathit{e}}^{\mathrm{\ensuremath{-}}}$\ensuremath{\rightarrow}${\mathit{e}}^{+}$${\mathit{e}}^{\mathrm{\ensuremath{-}}}$\ensuremath{\gamma}*\ensuremath{\gamma}*\ensuremath{\rightarrow}${\mathit{e}}^{+}$${\mathit{e}}^{\mathrm{\ensuremath{-}}}$\ensuremath{\gamma}\ensuremath{\gamma}, where X is a narrow resonance with mass between 100 and 3000 MeV. Formation of...
Abstract The structural, optical, and mechanical properties of TiO 2 nanolaminate films grown by plasma-enhanced atomic layer deposition are discussed. Several /Al O 3 /SiO compositions have been investigated to study the effect relative number ALD oxide cycles on film obtain a high refractive index coating with low optical losses, roughness, stress. formation crystalline observed at temperature, or thickness was inhibited periodically introducing ultra-thin amorphous layers into film. Only...
Tuning ion energies in plasma-enhanced atomic layer deposition (PEALD) processes enables fine control over the material properties of functional coatings. The growth, structural, mechanical, and optical HfO2 thin films are presented detail toward photonic applications. influence film thickness bias value on deposited at 100 °C using tetrakis(dimethylamino)hafnium (TDMAH) oxygen plasma substrate biasing is systematically analyzed. without a show an amorphous microstructure with low density,...
Nonlinear optical phenomena enable novel photonic and optoelectronic applications. Especially, metallic nanoparticles thin films with nonlinear properties offer the potential for micro-optical system integration. For this purpose, new materials need to be continuously identified, investigated, utilized While noble-metal nanoparticles, nanostructures, of silver gold have been widely studied, iridium (Ir) ultrathin not investigated applications yet. Here, we present a combined theoretical...
The fabrication of highly reflective aluminum coatings is still an important part current research due to their high intrinsic reflectivity in a broad spectral range. By using thin seed layers Cu, CuO x , Cr, CrO Au, and Ag, the morphology sputtered (unprotected) and, consequently, reflectance can be influenced. In this long-term study, behavior was measured continuously spectrophotometry. Particular layer materials enhance significantly reduce degradation. Combining such with evaporation...
Metallic coatings are essential for numerous optical systems due to their high and broadband reflectivity in the infrared spectral range. In contrast well-established (protected) silver gold mirror coatings, iridium is environmentally durable, referring ISO 9211-3 thermally stable up 600 °C even without protective layers, as demonstrated. Additionally, related structural properties of atomic layer deposited (ALD) magnetron sputtered (MS) Ir were investigated using spectrophotometry, FTIR,...
Absorption losses and laser-induced damage threshold (LIDT) are considered to be the major constraints for development of optical coatings high-power laser optics. Such require paramount properties, such as low due absorption, high mechanical stability, enhanced resistance, withstand high-intensity pulses. In this work, heterostructures were developed by sub-nanometer thin films SiO2 HfO2 using plasma-enhanced atomic layer deposition (PEALD) technique. Thin-film characterization techniques,...
The inclusive photon spectrum in hadronic decays of the $\ensuremath{\Upsilon}(2S)$ is measured with Crystal Ball detector at DORIS II. Four well separated lines, which are consistent decay hypothesis $\ensuremath{\Upsilon}(2S)\ensuremath{\rightarrow}\ensuremath{\gamma}+^{3}P_{2,1,0}$ and $^{3}P_{2,1}\ensuremath{\rightarrow}\ensuremath{\gamma}\ensuremath{\Upsilon}(1S)$, observed. energies lines from primary transitions...
The reaction ${e}^{+}$${e}^{\mathrm{\ensuremath{-}}}$\ensuremath{\rightarrow}${e}^{+}$${e}^{\mathrm{\ensuremath{-}}}$\ensuremath{\eta}${\ensuremath{\pi}}^{0}$${\ensuremath{\pi}}^{0}$ has been observed with the Crystal Ball detector at DORIS II storage ring DESY. \ensuremath{\eta}${\ensuremath{\pi}}^{0}$${\ensuremath{\pi}}^{0}$ mass spectrum is dominated by \ensuremath{\eta}', and two-photon width...
We have investigated the hadronic transitions \ensuremath{\Upsilon}(2S)\ensuremath{\rightarrow}${\ensuremath{\pi}}^{0}$${\ensuremath{\pi}}^{0}$\ensuremath{\Upsilon}(1S)\ensuremath{\rightarrow}\ensuremath{\gamma}\ensuremath{\gamma}\ensuremath{\gamma}\ensuremath{\gamma}l +${l}^{\mathrm{\ensuremath{-}}}$ (l=\ensuremath{\mu} or e) and...
Heterostructures increasingly attracted attention over the past several years to enable various optoelectronic and photonic applications. In this work, atomically thin interfaces of Ir/Al2O3 heterostructures compatible with micro-optoelectronic technologies are reported. Their structural optical properties were determined by spectroscopic microscopic techniques (XRR, XPS, HRTEM, ellipsometry, UV/vis/NIR spectrophotometry). The XRR HRTEM analyses reveal a layer-by-layer growth mechanism Ir in...
The wafer-level integration of high aspect ratio silicon nanostructures is an essential part the fabrication nanodevices. Metal-assisted chemical etching (MACE) a promising low-cost and high-volume technique for generation vertically aligned nanowires. Noble metal nanoparticles were used to locally etch substrate. This work demonstrates bottom-up self-assembly approach noble nanoparticle formation subsequent wet etching. macroscopic wafer patterning has been done by using poly(methyl...