A5050089336- Laser-Matter Interactions and Applications
- Spectroscopy and Quantum Chemical Studies
- Advanced Fiber Laser Technologies
- Semiconductor Quantum Structures and Devices
- Terahertz technology and applications
- Chalcogenide Semiconductor Thin Films
- Epigenetics and DNA Methylation
- Quantum Information and Cryptography
- Musculoskeletal pain and rehabilitation
- Advanced Materials Characterization Techniques
- Cancer Genomics and Diagnostics
- Silicon Nanostructures and Photoluminescence
- Advanced materials and composites
- Opioid Use Disorder Treatment
- Cancer-related Molecular Pathways
- Pain Management and Opioid Use
- Electron and X-Ray Spectroscopy Techniques
- Phase-change materials and chalcogenides
Philipps University of Marburg
2021-2023
University of Arizona
2020
University Medical Center Hamburg-Eppendorf
2003
Universität Hamburg
2003
The influence of propagation on the nonperturbative high-harmonic features in long-wavelength strong pulse excited semiconductors is studied using a fully microscopic approach. For sample lengths exceeding wavelength exciting light, it shown that effectively acts as very additional dephasing reduces relative height emission plateau up to six orders magnitude. This induced clarifies need use extremely short polarization decay times for quantitative analysis experimental observations.
To investigate the role of cell-cycle regulatory proteins in ovarian cancer, we performed immunohistochemistry for promoters cyclin E and D2 inhibitors, Rb, p16MTS1, p21WAF1, p27 KIP1, 93 carcinomas (77 with follow-up data). The results were correlated clinicopathological parameters prognostic value was determined by multivariate analysis. Strong Rb moderate-high immunoreactivity weakly associated high expression proliferation marker Ki67. By Cox's analysis, advanced stage (p=0.013), strong...
An $\mathit{ab}\phantom{\rule{0.16em}{0ex}}\phantom{\rule{0.16em}{0ex}}\mathit{initio}$-based fully microscopic approach is applied to study the nonlinear optical response of bulk tellurium. The structural and electronic properties are calculated from first principles using shLDA-1/2 method within density functional theory. resulting band structure dipole matrix elements serve as input for quantum mechanical evaluation anisotropic linear absorption spectra, yielding results in excellent...
For electro-optical modeling in solids, the transition dipole phase and related Berry connection carry important symmetry information about system. This is especially extremely nonlinear optics regime. One example even order harmonic intensity high generation from solids. Semiconductor Bloch equations are widely used as theoretical model of this phenomenon. Recently, what has been denoted ``random-phase problem'' or ``random gauge'' density-functional theory gained increasing attention,...
A systematic microscopic theory is presented for high‐harmonic generation in III–V semiconductors that are excited by strongly detuned high‐intensity electromagnetic pulses. As a mechanism the appearance of even harmonic orders, quantum interference different transition paths analyzed. For binary zinc‐blende semiconductors, InAs, InP, and GaAs, intensity ratio between even‐ odd‐order emission depends on strength respective intervalence band dipole coupling. However, large InP leads to odd...
In pursuit of efficient high-order harmonic conversion in semiconductor devices, modeling insights into the complex interplay among ultrafast microscopic electron–hole dynamics, nonlinear pulse propagation, and field confinement nanostructured materials are urgently needed. Here, a self-consistent approach coupling Bloch Maxwell equations is applied to compute transmission reflection spectra for finite slab sub-wavelength nanoparticle geometries. An increase generated high harmonics by...
High-order harmonics can be efficiently generated by high power mid-infrared ultrashort laser excitation of semiconductor materials. Interaction an intense femtosecond pulse with finite structures involves a complex interplay linear and nonlinear propagation effects electron-hole carrier dynamics, which self-consistently analyzed numerically coupled Maxwell-Semiconductor Bloch model. In the current work, such approach based on three-band model for gallium arsenide [111] is applied to...
Ultrashort laser-excited semiconductor nanostructures, supporting individual Mie or collective resonances, can serve as efficient miniaturized sources for low- and high-order harmonic generation. Upon laser excitation, multiple nonlinearities come into interplay on subwavelength spatial ultrafast temporal scales, including surface bulk effects, contributions from bound electrons photo-excited carriers. In turn, transient optical properties affect the structure amplitude of transmitted pulse....
An $\it{ab \,\, initio}$ based fully microscopic approach is applied to study the nonlinear optical response of bulk Tellurium. The structural and electronic properties are calculated from first principles using shLDA-1/2 method within density functional theory. resulting bandstructure dipole matrix elements serve as input for quantum mechanical evaluation anisotropic linear absorption spectra yielding results in excellent agreement with published experimental data. Assuming...