A5022463252- Photorefractive and Nonlinear Optics
- Photonic and Optical Devices
- Advanced Optical Imaging Technologies
- Photopolymerization techniques and applications
- Advanced Polymer Synthesis and Characterization
- Liquid Crystal Research Advancements
- Semiconductor Lasers and Optical Devices
- Organometallic Complex Synthesis and Catalysis
- Chemical Synthesis and Analysis
- Coordination Chemistry and Organometallics
- Cell Adhesion Molecules Research
- Advanced Fiber Laser Technologies
- Monoclonal and Polyclonal Antibodies Research
- Digital Holography and Microscopy
- Photonic Crystals and Applications
- Catalytic C–H Functionalization Methods
- Photochromic and Fluorescence Chemistry
- Phase-change materials and chalcogenides
- Phytochemical compounds biological activities
- Chemical Reaction Mechanisms
- Beetle Biology and Toxicology Studies
- Microbial Natural Products and Biosynthesis
- Interactive and Immersive Displays
- Optical Coatings and Gratings
- Catalytic Cross-Coupling Reactions
Covestro (Germany)
2016-2024
Bayer (Germany)
2003-2015
Klinikum Leverkusen
2010
University of Bonn
2006
Philipps University of Marburg
1995-2004
California Institute of Technology
2002
Optical data storage has had a major impact on daily life since its introduction to the market in 1982. Compact discs (CDs), digital versatile (DVDs), and Blu-ray (BDs) are universal data-storage formats with advantage that reading writing of does not require contact is therefore wear-free. These allow convenient fast access, high transfer rates, electricity-free low overall archiving costs. The driving force for development this area constant need increased capacity rate. use holographic...
Contents1. Materials for dynamic holographic 3D display 2. Photopolymerizable nanocomposite materials applications 3. Photopolymers the recording of waveguides 4. Shrinkage in materials: photopolymers 5. Advances photorefractive and devices 6. Industrial-scale material mass production vHOEs 7. Non-imaging optics solar energy conversion 8. Data security data storage 9. Multimodal acquisition using digital holography 10.EUV SXR tomography with compact short wavelength sources 11.Holographic...
We have been developing a new class of recording materials for volume holography, offering the advantages full color and depth tuning without any chemical or thermal processing, combined with low shrinkage detuning. These photopolymers are based on two-chemistry concept in which writing chemistry is dissolved preformed polymeric network. This network gives necessary mechanical stability to material prior recording. In this paper we describe several aspects holographic into Bayfol® HX...
The development of suitable recording media for applications such as holographic optical elements and data storage are significant research commercial interest. In this paper, a photopolymer material developed by Bayer MaterialScience is examined using various techniques then characterised the Non-local Photo-polymerization Driven Diffusion model. This demonstrates capabilities new class offering high index modulation, full colour recording, light sensitivity environmental stability. One key...
We have been developing a new class of recording materials for volume holography, offering the advantages full color and depth tuning without any chemical or thermal processing, combined with low shrinkage detuning. These photopolymers are based on two chemistry concept in which writing is dissolved preformed polymeric network. This network gives necessary mechanical stability to material prior recording. In this paper we show that process these can be successfully described within...
This paper describes a new class of recording materials for volume holographic applications suitable to meet commercial manufacturing needs. These next-generation photopolymers have the ability satisfy unmet demand color and depth tuning that is only possible with holograms. Unlike earlier photopolymers, these offer advantages no chemical or thermal processing combined low shrinkage detuning. Furthermore, exhibit high transparency, resolution more than 5000 lines/mm are environmentally...
Manipulating light with optical gratings based on volume Holographic Optical Elements (vHOEs), also known as Bragg gratings, has the advantage to reconstruct only first diffraction order and hence provide high efficiencies angular selectivity. In addition, they offer further benefit be fully transparent in off- condition like it is required combiners. We present latest status of our instant-developing photopolymer film technology (Bayfol® HX) show beneficial recording parameters -...
A highly sensitive NIR photoinitiating system based on dye/borate associated pairs.
Abstract The new photopolymers for holographic applications described herein are based on a cross‐linked matrix in which the grating is formed by photo‐polymerization of guest monomers an interference pattern recording light. Diffusion monomer, triggered this photo‐polymerization, from dark to bright fringes key parameter creating high modulation refractive index Δn during hologram recording. This leads visual volume holograms with diffraction efficiency. self‐processing. After only...
Volume Holographic Optical Elements (vHOE) offer angular and spectral Bragg selectivity that can be tuned by film thickness holographic recording conditions. With the option to integrate complex optical function in a very thin plastic layer formerly heavy refractive optics made lightweight especially for large area applications like liquid crystal displays, projection screens or photovoltaic. Additionally their enables integration of several completely separated functions same film. The new...
Optimization of holography recording in photopolymers was studied from the point view a quite general process, that is, photogeneration radicals. On basis dye/coinitiator photoinitiating system, effect primary events and their relative efficiency investigated with respect to final overall properties, such as diffraction efficiency. Quenching dye excited states by borate salts coinitiators exhibits important differences depending on used (Rose Bengal or Safranine O). Keeping mind both singlet...
The versatility of Volume Holographic Optical Elements (vHOE) is high, especially because their tunable angular and spectral Bragg selectivity. Those unique lightweight, thin flat optical elements are enabled by the new instant developing photopolymer film Bayfol® HX technology, which allows to mass produce cost effective diffractive optics due its simplified robust holographic recording process. From a pure scientific point view volume holography well established. In practice though,...
The new holographic photopolymers described herein are based on a cross-linked matrix in which the grating is formed by photopolymerization of guest monomers an interference pattern recording light. Diffusion monomer, triggered this photopolymerization, from dark to bright fringes key parameter for creating high modulation refractive index δn during hologram recording. This leads visual volume holograms with diffraction efficiency. self-processing, after only (incoherent) light exposure...
Propagation rate coefficients are provided—for the first time—for an entire class of urethane moieties containing acrylates, which display extremely high propagation rate.
Abstract Ab initio calculations showed that the two elementary steps in racemization of α‐methylthioethyl anion ( 7 ), inversion pyramidal anionic center, and rotation around C − S bond, occur sequence are not concerted. The former process passes over a barrier 1.1 kcal/mol, latter one 10.9 kcal/mol. MNDO on α‐phenylthioethyl 8 ) revealed preferred conformation S‐aryl allowing maximum delocalization sulfur lone pairs into π* orbital aryl group. This orientation is maintained during bond...
The ring closing olefine metathesis in protic solvents using a new ruthenium benzylidene complex is described.
Bayfol<sup>®</sup> HX film is a new class of recording materials for volume holography. It was commercialized in 2010 and offering the advantages full-color moisture resistance without any chemical or thermal processing, combined with low shrinkage detuning. These photopolymers are based on two-chemistry concept which writing chemistry dissolved preformed polymeric network. This network provides necessary mechanical stability to material prior recording. In addition well-known security...
For a long time volume Holographic Optical Elements (vHOE) have been discussed as an alternative, but were hampered by lack of suitable materials. They provide several benefits over surface corrugated diffractive optical element like high diffraction efficiency due to their ability reconstruct single order, freedom design freely setting the replay angles and adjusting bandwidth selection vHOE's thickness. Additional interesting features are related Bragg selectivity providing transparent...
Bayfol® HX photopolymer films prove themselves as easy-to-process recording materials for volume holographic gratings (VHGs) and are available in customized grade at industrial scale. Their full-color (RGB) replay capabilities two of their major advantages. Moreover, the adjustable diffraction efficiency, tunable angular spectral selectivity VHGs recorded into Bayfol<sup>®</sup> well unmatched optical clarity enables superior invisible "Off-Bragg" functionality. As a film product,...
Photopolymer films (Bayfol® HX) have been recently introduced into the market place and prove themselves as easy to process for volume holographic optical element (vHOE) recording. The new Bayfol® HX instant developing photopolymer film provides full color capability adjustable diffraction efficiency well an unprecedented clarity when compared classical recording materials like silver halide emulsions (AgHX) or dichromated gelatin (DCG). Besides step no pre- post-processing is necessary mass...
NMR studies have shown that the hexenyllithium compound 4 exists at –80 °C in THF solution as two distinct species: 'normal' solvated alkyllithium 4a and internally π-complexed species 4b a ratio of 5.5:1.
Abstract Die optische Datenspeicherung hat seit Ihrer Markteinführung 1982 das tägliche Leben geprägt. Compact Disk (CD), Digital Versatile (DVD) und Blu‐ray (BD) sind universelle Datenträgerformate mit den Vorteilen des kontaktfreien damit abnutzungslosen Lesens Schreibens der digitalen Daten. Sie ermöglichen einen schnellen Datenzugriff, hohe Transferraten eine stromfreie bei sehr günstigen gesamten Archivierungskosten. Der stete Wunsch nach Erhöhung Datenspeicherkapazitäten ‐transferraten...
The main function of any augmented reality system is to seamlessly merge the real world perception a viewer with computer generated images and information. Besides real-time head-tracking room-scanning capabilities combiner optics, which optically natural artificial visual information, represent key component for those systems. Various types optics are known industry, all their specific advantages disadvantages. Beside well-established solutions based on refractive or surface gratings,...