Péter Petrik

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Biodegradable polyesters such as poly(lactic-co-glycolic acid) copolymers (PLGA) are preferred materials for drug carrier systems although their surface hydrophobicity greatly limits their use in controlled drug delivery. PLGA thin films on a solid support blended with PEG-containing compound (Pluronic) were used as model systems to study the interfacial(More)
Chemical dissimilarity of tellurium oxide with silica glass increases phase separation and crystallization tendency when mixed and melted for making a glass. We report a novel technique for incorporating an Er(3+)-doped tellurite glass composition into silica substrates through a femtosecond (fs) laser generated plasma assisted process. The engineered(More)
In order to realize a versatile high throughput production of micro-optical elements, UV-curable polymer composites containing titanium dioxide nanoparticles were prepared and characterized. The composites are based on an industrial prototype epoxy polymer. Titanium dioxide nanoparticles smaller than 10 nm were synthesized by the nonaqueous sol method and(More)
Because the composition and the thickness of the thin films are very important for the fabrication of the devices, in this study we have undertaken the determination of the composition and the thickness of the RF sputtered amorphous silicon alloy thin films deposited at room temperature under very different preparation conditions by using various(More)
The optical properties of semiconductors largely depend on the disorder in the crystal structure, especially in the photon energy range near the direct interband transition energies. The E<inf>1</inf> and E<inf>2</inf> critical point (CP) energies in silicon are about 3.4 eV (&#x223C;365 nm) and 4.2 eV (&#x223C;295 nm), respectively. These transitions are(More)
Optical scatterometry is the state of art optical inspection technique for quality control in lithographic process. As such, any boost in its performance carries very relevant potential in semiconductor industry. Recently we have shown that coherent Fourier scatterometry (CFS) can lead to a notably improved sensitivity in the reconstruction of the geometry(More)
Plasmon-enhanced in situ spectroscopic ellipsometry was realized using the Kretschmann geometry. A 10-μL flow cell was designed for multi-channel measurements using a semi-cylindrical lens. Dual-channel monitoring of the layer formation of different organic structures has been demonstrated on titania nanoparticle thin films supported by gold. Complex(More)
In our previously published paper [1, 2] we demonstrated that deuterium adsorbs on Si surface at room temperature much stronger than hydrogen [3, 4]. Moreover, in case of deuterium passivated wafers the vacuum storage can be omitted without risking the non-controlled native oxidation of silicon for up to 5 hours or more. It could be a suitable and more(More)
4H-SiC single crystalline substrates were implanted at room temperature with 150 keV Al+ ions using fluences of 4 1014, 1 1015, and 2 1015 cm−2 with current density of 2.5 A cm−2. The samples were subsequently annealed at 1100 °C in N2 for 1 h in order to analyze their structural recovery. The disorder induced in both sublattices by the Al+ ions was studied(More)
We show that the interface between gold and thermally formed cuprous oxide, which emits terahertz radiation when illuminated with ultrafast femtosecond lasers, is in fact an AuCu/Cu₂O interface due to the formation of the thermal diffusion alloy AuCu. The alloy enables the formation of a Schottky-barrier-like electric field near the interface which is(More)