A5046358709- Phase-change materials and chalcogenides
- Chalcogenide Semiconductor Thin Films
- Glass properties and applications
- Digital Filter Design and Implementation
- Advanced Adaptive Filtering Techniques
- Image and Signal Denoising Methods
- Solid-state spectroscopy and crystallography
- Nonlinear Optical Materials Studies
- Liquid Crystal Research Advancements
- Quantum Dots Synthesis And Properties
- Photorefractive and Nonlinear Optics
- Optical and Acousto-Optic Technologies
- Advanced Data Compression Techniques
- Photonic and Optical Devices
- Crystal Structures and Properties
- Advanced Thermoelectric Materials and Devices
- X-ray Diffraction in Crystallography
- Numerical Methods and Algorithms
- Crystallization and Solubility Studies
- Optical Coatings and Gratings
- Thin-Film Transistor Technologies
- Optical Polarization and Ellipsometry
- Nanocluster Synthesis and Applications
- Laser Material Processing Techniques
- Physics of Superconductivity and Magnetism
University of Pardubice
2015-2024
Czech Technical University in Prague
2008-2019
Jan Długosz University
2018
Austin Peay State University
2014-2018
Czech Academy of Sciences, Institute of Macromolecular Chemistry
2004-2017
Applied Mathematics (United States)
2017
Lehigh University
2006-2014
Czech Academy of Sciences
1986-2004
Friedrich-Alexander-Universität Erlangen-Nürnberg
1989-1999
Institute of Chemical Technology
1987-1992
During the last years, several time-frequency decomposition tools have been applied for diagnosis of induction motors, those cases in which traditional procedures, such as motor current signature analysis, cannot yield necessary response. Among them, Cohen distributions widely selected to study transient and even stationary operation due their high-resolution detailed information provided at all frequencies. Their main drawback, cross-terms, has tackled either modifying distribution, or...
The advantages and applications of chalcogenide glass (ChG) thin film photoresists for grayscale lithography are demonstrated. It is shown that the ChG films can be used to make ultrathin (~600 nm), high-resolution patterns, which find their application, example, in IR optics. Unlike polymer photoresists, transparent patterns useful as such on surface or transfer etched pattern into silicon other substrates. Even if an etch mask substrate, its greater hardness achieve a selectivity than...
Fast analytical design procedures for finite impulse response (FIR) maximally flat (MF) and optimal equiripple (ER) notch filters are introduced. The closed form solution provides recursive computation of the coefficients filter. ER FIR in Chebyshev sense. relation between MF filter is presented order to emphasize superior performance narrow-band over their counterparts. discrete nature frequency both types emphasized. Four examples included demonstrate efficiency approach.
The atomistic origin of photoinduced vector (polarization-dependent) phenomena in As–Se films is determined by extended x-ray absorption fine structure with situ exposure to polarized laser light. A structural change observed directly for any material: there an expansion the nearest-neighbor distance around Se atoms, magnitude which depends on direction light polarization; effect As atoms relatively smaller. results point scalar as well changes properties, either persist after removed, or...
Abstract Thermal, optical, X-ray excited and magnetic methods were used to develop a microstructural model of physical ageing in Se-rich glasses. The glass composition As10Se90, possessing typical cross-linked chain structure, was chosen as object for the investigations. effect this revealed by differential scanning calorimetry, whereas corresponding changes its atomic arrangement studied extended absorption fine Raman solid-state 77Se nuclear resonance spectroscopy. Straightening–shrinkage...
We report on the preparation of thin As35S65 films from their amine based solutions by a spiral bar coating technique flexible PET substrates and direct writing subwavelength surface corrugated gratings with period 350 nm into these excimer laser interference lithography. The structural optical properties coated glass are investigated in detail compared those samples fabricated vacuum thermal evaporation. polarization dependent spectral filtering guided mode resonance devices built...
Photoinduced structural changes in molecular semicrystalline ${\mathrm{As}}_{4}{\mathrm{Se}}_{3}$ films have been characterized by extended x-ray absorption fine structure and diffraction under situ band-gap laser illumination. Transient permanent the local long-range determined quantitatively. In contrast to fully amorphous arsenic selenide films, a photoinduced contraction has observed films. A comprehensive phenomenological model is proposed for volume change As-based chalcogenides. This...
The algebraic form of Zolotarev polynomials refraining from their parametric representation is introduced. A recursive algorithm providing the coefficients for a polynomial an arbitrary order obtained linear differential equation developed this purpose. corresponding narrowband, notch, and complementary pair FIR filters are optimal in Chebyshev sense. recursion giving explicit access to impulse response also presented. Some design examples included demonstrate efficiency presented approach.
Abstract Light‐induced structural changes of As‐S glasses and films were probed both by macro FT‐Raman photon‐energy dependent micro‐Raman spectroscopy using different spectral composition photoactive light: polychromatic or wavelengths laser radiation. The illumination thermal treatment leads to continuous decrease in intensity characteristics vibrational modes molecular cage‐like species like As 4 S , 3 etc. Under the picture is different, new observed features Raman spectra As‐rich glass...
Amorphous chalcogenide thin films of Ge25S75 composition have been deposited by spin-coating technique. Optical properties were investigated spectroscopic ellipsometry in UV-MIR spectral range. Obtained results prove increase refractive index the transparent region and decrease their thickness with increasing annealing temperature implying densification glass structure. Short wavelength absorption edge is shifting to lower energies (red shift) temperature. Decreasing organic molecules...