Communications - Scientific Letters of the University of Zilina, 2017 (vol. 19), issue 3
Articles
Photonic Devices with Siloxane Membranes
Matej Goraus, Lubos Suslik, Dusan Pudis, Jana Durisova, Daniel Jandura, Jaroslav Kovac, Marek Tlaczala
Communications - Scientific Letters of the University of Zilina 2017, 19(3):3-8 | DOI: 10.26552/com.C.2017.3.3-8 
Expansion of polymer nanotechnologies accelerated the polymer photonics. This technology brings novel interesting results with simple and cheap solutions. Promising candidates are siloxane materials as polydimethyl siloxane (PDMS) and polydimethyldiphenyl siloxane (PDMDPS) with unique mechanical and optical properties. In this paper we present laser lithography technologies in a combination with siloxane embossing for fabrication of different grating structures with periodical and quasiperiodical symmetry. We present the concept of siloxane based thin membranes with patterned surface as an effective diffraction element for modification of radiation...
On Some Ambiguities of the Absorption Edge and Optical Band Gaps of Amorphous and Polycrystalline Semiconductors
Jarmila Mullerova, Pavol Sutta
Communications - Scientific Letters of the University of Zilina 2017, 19(3):9-15 | DOI: 10.26552/com.C.2017.3.9-15
This paper reports on somewhat puzzling character of the determination of the optical band gap energies of amorphous and polycrystalline semiconductors, where probably the mixed-phase composition and structural and compositional disorder are main reasons for the ambiguities. The analysis is performed using spectra of absorption coefficients of the featured samples of Si:H and Zn-Ti-O extracted by numerical analysis of transmittance measurements. The differences originating from using several procedures to process spectra of absorption coefficients are discussed.
Polymer Based Devices for Photonics on the Chip
Daniel Jandura, Peter Gaso, Dusan Pudis
Communications - Scientific Letters of the University of Zilina 2017, 19(3):16-20 | DOI: 10.26552/com.C.2017.3.16-20
In this paper we present promising technology for preparation of photonic devices based on polymer materials on the chip. We designed 2D and 3D structures in CAD (computer-aided design) software and we used two-photon polymerization mechanism for direct writing of these structures to IP-Dip photoresist material. This paper also deals with experimental procedures for preparation of polymer photonic devices on the chip and a new way of light coupling to devices on the chip. Morphological properties of prepared devices were investigated by scanning electron microscope (SEM). As a result, transmission spectrum characteristic was measured.
Analysis of Photoluminiscence in the NCSI-DMA System
Stanislav Jurecka, Kentaro Imamura, Taketoshi Matsumoto, Hikaru Kobayashi
Communications - Scientific Letters of the University of Zilina 2017, 19(3):21-25 | DOI: 10.26552/com.C.2017.3.21-25
Silicon nanocrystalline particles (ncSi) were fabricated from the Si swarf using the beads milling method. Observed photoluminiscence spectra (PL) of the ncSi in hexane with the dimethylanthracene molecules (DMA) show photoluminescence peaks at energies of 2.55, 2.75, 2.92, and 3.09 eV. The shape of PL spectra corresponds to the vibronic structure of adsorbed DMA molecules. The PL intensity of the ncSi-DMA system increases by ~3000 times by adsorption of DMA on Si nanoparticles. The PL enhancement results from an increase in absorption probability of incident light by DMA caused by adsorption on the surface of ncSi. Theoretical model of the PL experiment...
Optical Pdms Microfibre Sensor For Displacement Determination
Daniel Kacik, Ivan Martincek, Norbert Tarjanyi
Communications - Scientific Letters of the University of Zilina 2017, 19(3):26-29 | DOI: 10.26552/com.C.2017.3.26-29
We prepared and demonstrated the usage of an optical polydimethylsiloxane (PDMS) microfibre sensor for displacement measurement. The sensor consists of PDMS microfibre placed between two conventional single-mode optical fibres. For proper bend of the microfibre the structure forms Mach-Zehnder interferometer. In that case, one arm of the interferometer consists of the microfibre and second one of the air. In addition, it is possible to resize the air arm in a range of several tens of micrometres with sufficient ratio of intensities between lights transmitted through the interferometer arms. For optical paths difference smaller than optical coherence...
Micro-Optics for Lab-on-a-Chip
Maria Figurova, Peter Gaso, Dusan Pudis
Communications - Scientific Letters of the University of Zilina 2017, 19(3):30-33 | DOI: 10.26552/com.C.2017.3.30-33
Lab-on-a-chip (LOC) is nowadays one of the most interesting topics at the field of biomedicine and biosensing applications. Mainly devices that integrate a detection system right into a chip with microfluidic network are highly desirable. In this article we will present Mach-Zehnder interferometer created in IP-Dip photoresist by direct laser lithography system for laboratory on chip applications. Interferometer will be later used for biosensing application as integrated micro-optical device inside a microfluidic chip. Measurements of transmission characteristics of water solution with different sugar concentration show promising ability of the Mach-Zehnder...
Deployment and Measurement of Quality of Service Parameters for Triple Play Services in Optical Access Networks
Jan Latal, Miroslav Kralik, Zdenek Wilcek, Jakub Kolar, Josef Vojtech
Communications - Scientific Letters of the University of Zilina 2017, 19(3):34-45 | DOI: 10.26552/com.C.2017.3.34-45
Broadband telecommunication networks are the future of communication and distribution of multimedia services. Thanks to the high transmission potential and capacity of optical fibres, the optical networks are predestined to be more widely used in telecommunications considering the higher data rates through Triple Play services. This paper describes the impact of selected quality parameters on multimedia services defined as Triple Play within an optical network based on the EPON standard. The Triple Play services are then evaluated with measuring instruments and software applications according to QoS requirements and using evaluation methods based on...
Dielectric Study of Lithium and Sodium Borophosphate Glasses
Jana Mizerakova, Peter Hockicko, Francisco Munoz
Communications - Scientific Letters of the University of Zilina 2017, 19(3):46-50 | DOI: 10.26552/com.C.2017.3.46-50
Ionic conductivity and dielectric properties such as dielectric permittivity and loss tangent for the samples of lithium and sodium borophosphate glasses were investigated using the electrical conductivity measurements in the range of frequency from 10 Hz to 2 MHz and various temperatures below Tg. The measured data of ac conductivity were described according Jonscher's power law and experimental values of imaginary part of electric modulus were fitted by KWW function. From the fitted parameters, the activation energies for conduction and relaxation time were found which characterize the hopping processes and transport mechanism in these ion conducting...
Acoustic Investigation of the Structure of Magneto-Rheological Fluid
Jozef Kudelcik, Peter Bury, Stefan Hardon, Michal Sedlacik, Tomas Plachy
Communications - Scientific Letters of the University of Zilina 2017, 19(3):51-56 | DOI: 10.26552/com.C.2017.3.51-56
The acoustic spectroscopy is used to study properties and changes in structural arrangement in silicone oil based magneto-rheological fluids with carbonyl iron particles upon the effect of an external magnetic field. Attenuation spectra at three temperatures for various concentrations of magnetic particles are presented. The attenuation of acoustic waves was measured for a jump change of the magnetic field to 200 mT as a function of the temperature. The relaxation effects for the acoustic attenuation after switching off the magnetic field and its decrease to the similar value as for clean silicone oil were observed. The change of acoustic attenuation...
Statistical and Fractal Analysis of Random Height Function
Stanislav Jurecka, Maria Jureckova
Communications - Scientific Letters of the University of Zilina 2017, 19(3):57-61 | DOI: 10.26552/com.C.2017.3.57-61
Nanostructured semiconductor surfaces are commonly used for suppression of the light reflection. We prepared several kinds of surface structures on silicon substrate and analyzed the properties of the random height function used for the description of observed surface morphology. Statistical and fractal methods used in this analysis provide useful information for the optimization of the surface forming procedure. Multifractal analysis provides additional information about the surface morphology, not contained in the results of standard statistical methods. Numerical procedures used in the multifractal analysis were tested by using theoretical random...
Analyzing Powers It11 and T20 of Dp -> Ppn Reaction at 400 Mev Investigated at Nuclotron
Marian Janek, Vladimir P. Ladygin, Semen M. Piyadin, Yuri V. Gurchin, Alexander Yu. Isupov, Julia-Tatiana Karachuk, Anatoly N. Khrenov, Pavel K. Kurilkin, Alexei N. Livanov, Sergei G. Reznikov, Yaroslav T. Skhomenko, Gabriela Tarjanyiova, Arkady A. Terekhin
Communications - Scientific Letters of the University of Zilina 2017, 19(3):62-65 | DOI: 10.26552/com.C.2017.3.62-65
One of the tools to study spin structure of short range correlations (SRCs) and three nucleon forces is the measurement of the polarization observables. Deuteron induced reactions at intermediate energies are investigated at Internal Target Station (ITS) of Nuclotron through the dp elastic and dp → ppn reactions. Analyzing powers iT11 and T20 analyzing powers of dp → ppn reaction at 400 MeV are presented.
Generation of Random Deviates for Relativistic Quantum-Statistical Distributions
Boris Tomasik, Ivan Melo, Jakub Cimerman
Communications - Scientific Letters of the University of Zilina 2017, 19(3):66-70 | DOI: 10.26552/com.C.2017.3.66-70
We provide an algorithm for generation of momenta (or energies) of relativistic particles according to the relativistic Bose-Einstein or Fermi-Dirac distributions. The algorithm uses rejection method with effectively selected comparison function so that the acceptance rate of the generated values is always better than 0.9. It might find its use in Monte-Carlo generators of particles from reactions in high-energy physics.
The Current LHC Limits for the TBESS Lagrangian
Mikulas Gintner, Josef Juran
Communications - Scientific Letters of the University of Zilina 2017, 19(3):71-76 | DOI: 10.26552/com.C.2017.3.71-76
We investigate how the recent LHC measurements limit the parameters of the hypothetical vector resonance triplet. The vector resonances are assumed to represent bound states of hypothetical strongly-interacting new physics, a candidate of the extension of the Standard model.
Lithium Niobate-Based Integrated Photonics Utilizing Photorefractive Effect
Norbert Tarjanyi, Daniel Kacik
Communications - Scientific Letters of the University of Zilina 2017, 19(3):77-82 | DOI: 10.26552/com.C.2017.3.77-82
Lithium niobate (LiNbO3) is an ideal material with many interesting properties for integrated photonics. Despite the rich set of properties the technology of lithium niobate integrated optics has not evolved as much as integrated optics in III-V semiconductors and silicon photonics. Future applications of LiNbO3 as an integrated optical platform require a technology that can materialize ultracompact and efficient optical circuits on the material. To achieve the goal two possible approaches can be considered: developing of tightly-confined lithium niobate photonic devices and circuits on silicon substrates by hybrid technologies and, developing pure...
Comparison of Contrasting Method Based on Local Contrast Measurement
Tomas Nahlik
Communications - Scientific Letters of the University of Zilina 2017, 19(3):83-87 | DOI: 10.26552/com.C.2017.3.83-87
Some biological experiments and techniques, especially electron microscopy, require special sample treatments. These treatments usually change the samples and biologist cannot apply different techniques on the very same sample. In this case, it is necessary to have some comparison method to compare different treatments. In the electron microscopy, the heavy metals are used as contrasting chemicals. Question is which contrasting method is the best or which is better for imaging of given samples. Standard method is based on visual comparison and it is user dependent. We propose to measure local contrast and some other values like SNR (Signal-to-Noise...
Analysis of Possibilities of Increasing the Spanned Distance Using EDFA and DRA in DWDM System
Tomas Ivaniga, Petr Ivaniga, Jan Turan, Lubos Ovsenik
Communications - Scientific Letters of the University of Zilina 2017, 19(3):88-95 | DOI: 10.26552/com.C.2017.3.88-95
The aim of this article is a comparison of the EDFA (Erbium Doped Fibre Amplifier) and the DRA (Distributed Raman Amplifier) in a fully optical communication system, working on a specific wavelength. The amplifiers are compared based on their position in the optical loop and are evaluated according to the Q-factor and bit error rate (BER). In the case of the DRA, the accomplished distance was smaller, while changing the optical power in CW (Continuous Wave) to attain better BER. In the application of the EDFA a similar optical loop was created, as well, while the basic parameter for comparison was a bit speed. For the EDFA the bit speed was changed...
Resonance Vibration of Railway Bridges Subjected to Passing Vehicles
Milan Moravcik, Martin Moravcik
Communications - Scientific Letters of the University of Zilina 2017, 19(3):96-101 | DOI: 10.26552/com.C.2017.3.96-101
This paper discusses some issues related to dynamic effects in railway bridges focussed on the simulation of the resonant vibration for the small and medium span simply supported railway bridges subjected to a series of moving vehicle. Presented parametric study is concerned with the dynamic deflection of the simply supported railway truss bridge of the span Lb = 38 m, due to the series of the ten moving loads representing a conventional train with the IC-coaches employed in Slovakia, with the impact to the resonance speed c2res = 65.03 m/s = 234.11 km/h. The deflection amplitude (c2 = 33)w(1),(P1,P2....PN)(Lb / 2,t) increase with an increasing number...
Insulation Thickness versus Dynamic Thermal Parameters of External Walls with Regard to the Thermal Stability
Radoslav Ponechal, Daniela Staffenova
Communications - Scientific Letters of the University of Zilina 2017, 19(3):102-108 | DOI: 10.26552/com.C.2017.3.102-108
It appears that the walls, insulated according to the new requirements for thermal resistance, can contribute to thermal stability. This is advantageous not only for the thermal comfort during the summer but in the cases of the intermittent heating, or overheating, as well. This article evaluates some alternatives of insulated and uninsulated external walls. The phase time shift of the indoor surface temperature with respect to the outdoor surface, together with the periodic penetration depth of indoor surface temperature, are considered in this analysis. Analyzing subsurface temperature courses we evaluate the ability of construction to accumulate...
Selecting the Low Alloy-Tempered Steel for Manufacturing the Highly Loaded Responsible Parts
Vukic Lazic, Dusan Arsic, Ruzica R. Nikolic, Miodrag Arsic, Branislav Hadzima
Communications - Scientific Letters of the University of Zilina 2017, 19(3):109-114 | DOI: 10.26552/com.C.2017.3.109-114
The selecting procedure of the optimal material for manufacturing the highly loaded responsible parts for military applications is presented in this paper. The considered part is in exploitation subjected to complex compressive-impact loading and cyclically to high temperatures, as well. The proper selection of material can be done exclusively based on the theoretical and experimental analysis of properties of the steel in question. The theoretical and experimental selecting of adequate steel for manufacturing such parts is done based on requirements arising from their working conditions. Based on the available data for various steels, chemical composition,...