Petr Nemec

Petr Nemec
University of Pardubice · Department of Graphic Arts and Photophysics

Ph.D.

About

184
Publications
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2,702
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January 1998 - December 2012
University of Pardubice

Publications

Publications (184)
Article
Full-text available
The primary objective of this study is the development of transparent thin film materials in the IR enabling strong infrared absorption of organic compounds in the vicinity of metal nanoparticles by the surface plasmon effect. For developing these optical micro-sensors, hetero-structures combining gold nanoparticles and chalcogenide planar waveguid...
Article
UV pulsed laser deposition was employed for the fabrication of amorphous (GeTe)(x)(Sb2Te3)(1) (x). (x - 1, 0.66, 0.5, 0.33, and 0) thin films. The local structure of as-deposited (amorphous) as well as annealed (crystallized) layers was studied using Raman scattering spectroscopy. Raman spectra were recorded on bulk materials used for the depositio...
Article
Full-text available
Pulsed laser deposition technique was used for the fabrication of Ge-Te rich GeTe-Sb2Te3 (Ge6Sb2Te9, Ge8Sb2Te11, Ge10Sb2Te13, and Ge12Sb2Te15) amorphous thin films. To evaluate the influence of GeTe content in the deposited films on physico-chemical properties of the GST materials, scanning electron microscopy with energy-dispersive X-ray analysis,...
Article
Full-text available
The model to tailor the required chemical composition of thin films fabricated via multisource deposition, exploiting basic physicochemical constants of source materials, is developed. The model is experimentally verified for the two-source depositions of chalcogenide thin films from Ga–Sb–Te system (tie-lines GaSb–GaTe and GaSb–Te). The thin films...
Article
Quaternary Ge-Sb-Se-Te chalcogenide thin films were fabricated by rf magnetron sputtering from Ge19Sb17Se64−xTex (x=5, 10, 15, 20) sputtering targets in order to select appropriate compositions for infrared sensor and optical nonlinear applications. An influence of chemical composition and deposition parameters on the optical properties, structure...
Article
Quaternary Ge‐Sb‐Se‐Te thin films deposited from Ge19.4Sb16.7Se63.9−xTex (x = 5, 10, 15, 20) glass‐ceramics targets by rf magnetron sputtering were studied using laser ablation quadrupole ion trap time of flight mass spectrometry. Binary, ternary, and quaternary GeaSbbSecTed clusters were formed and their stoichiometry was determined. By comparison...
Article
Radio-frequency magnetron co-sputtering technique with GeTe and Sb2Te3 targets has been used for the deposition of Ge-Sb-Te amorphous thin films. Fabricated layers cover broad region of chemical composition (~17.4-35.0 at. % of Ge, ~14.2-29.0 at. % of Sb) with slight variation in Te content (50.8-53.6 at. % of Te). Upon annealing-induced crystalliz...
Article
Laser ablation of Ga‐Sb‐Te chalcogenide thin films prepared by radio‐frequency magnetron co‐sputtering was monitored with quadrupole ion trap time of flight mass spectrometry (QIT TOF MS). The mass spectra of eleven thin films of various composition (Ga: 0‐53.1, Sb: 0‐52.0, and Te: 0‐100.0 at. %) were recorded. Several series of unary (Gax, Sby, an...
Article
Full-text available
Pulsed UV laser deposition was exploited for the preparation of thin Sn50–xAsxSe50 (x = 0, 0.05, 0.5, and 2.5) films with the aim of investigating the influence of low arsenic concentration on the properties of the deposited layers. It was found that the selected deposition method results in growth of a highly (h00) oriented orthorhombic SnSe phase...
Article
Full-text available
The objective of this study is to demonstrate the successful functionalization of the surface of a chalcogenide infrared waveguide with the ultimate goal of developing an infrared micro-sensor device. First, a polyisobutylene coating was selected by testing its physico-chemical compatibility with a Ge-Sb-Se selenide surface. To simulate the chalcog...
Article
A functional waveguide for photonic applications must fulfil some specific requirements in terms of dimension, shape, etch rate and roughness. In this study, Ge-Sb-Se thin films were etched using an Inductively Coupled Plasma reactor via fluorine-based chemistry. In a SF6 plasma, etch rate and roughness highlight a micro masking effect which origin...
Article
Full-text available
In this paper, the plasmon field enhanced light-induced changes are investigated in the amorphous Ge24Se76 layer incorporating Au nanoparticles. The presence of gold nanoobjects in amorphous chalcogenide/gold heterostructure influences the optical and structural properties, as well as volume changes of the material. It also enhances the Raman signa...
Article
Full-text available
Chalcogenide-oxide Bragg reflectors and a 1-D vertical cavity for operation at 1.55 µm were designed and fabricated via radio-frequency sputtering. The Bragg reflectors were made out of repeating layers of Al2O3 and As2Se3, and the cavity was obtained via a Ga5Ge20Sb10S65:Er3+ defect layer. The layers’ properties were assessed via ellipsometry and...
Article
Full-text available
Controlling low power light beam self-confinement with ultrafast response time opens up opportunities for the development of signal processing in microdevices. The combination of highly nonlinear medium with the tight confinement of plasmonic waves offers a viable but challenging configuration to reach this goal. In the present work, a strongly enh...
Article
Full-text available
This work reports on the properties of luminescent waveguides based on quaternary Ga-Ge-Sb-Se amorphous thin films doped with praseodymium. The waveguides were fabricated via magnetron co-sputtering, followed by inductively coupled plasma reactive ion etching. The initial thin film thickness and optical properties were assessed and the spectroscopi...
Article
A 1 x 2 multimode interferometer beam splitter based on mid-infrared emitting chalcogenides waveguides is designed. This device multiplexes mid-infrared light in two channels whose respective passbands overlap either CO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> or CO absorption bands, res...
Article
Full-text available
Despite the renewed interest in rare earth-doped chalcogenide glasses lying mainly in mid-infrared applications, a few comprehensive studies so far have presented the photoluminescence of amorphous chalcogenide films from visible to mid-infrared. This work reports the fabrication of luminescent quaternary sulfide thin films using radio-frequency sp...
Article
Full-text available
In this paper, the plasmon field enhanced light-induced changes are investigated in the amorphous Ge24Se76 layer incorporating Au nanoparticles. The presence of gold nanoobjects in amorphous chalcogenide/gold heterostructure influences the optical and structural properties, as well as volume changes of the material. It also enhances the Raman signa...
Article
Amorphous Ge-Sb-Se thin films were co-sputtered from ${{\rm GeSe}_4}$GeSe4 and ${{\rm Sb}_2}{{\rm Se}_3}$Sb2Se3 targets. Depending on the film composition, linear optical properties were studied by ellipsometry. The Kerr coefficient and two-photon absorption coefficient were estimated using Sheik-Bahae’s formalism for co-sputtered films of ${{\rm G...
Article
A radio frequency magnetron co-sputtering technique exploiting GaTe and ${\rm Sb}_2 {\rm Te}_3$Sb2Te3 targets was used for the fabrication of Ga-Sb-Te thin films. Prepared layers cover broad region of chemical composition (${\sim}{10.0 {-} 26.3}\,\, {\rm at.}$∼10.0-26.3at. % of Ga, ${\sim}{19.9 {-} 34.4}\,\, {\rm at.}$∼19.9-34.4at. % of Sb) while k...
Article
Full-text available
A bismuth-selenium system from mixtures of the powdered elements in various molar ratios and from Bi2Se3 crystals and/or thin films was studied using laser desorption ionization and surface assisted laser desorption ionization. The Bi m Se n clusters were observed in both positive and negative ion modes, but the mass spectra were more intense, and...
Article
Ternary chalcogenides of a Ga–Sb–Se system are prospective materials for potential applications in the field of infrared optics. This Letter deals with the optical properties and photosensitivity of Ga–Sb–Se thin films deposited by co-sputtering, enabling us to fabricate amorphous thin films outside the glass-forming region. The optical bandgap ran...
Article
Full-text available
The Ge-Bi-Se thin films of varied compositions (Ge content 0–32.1 at. %, Bi content 0–45.7 at. %, Se content 54.3–67.9 at. %) have been prepared by rf magnetron (co)-sputtering technique. The present study was undertaken in order to investigate the clusters generated during the interaction of laser pulses with Ge-Bi-Se thin films using laser ablati...
Article
This study compared Sb2Se3 material in the form of commercial polycrystalline bulk, sputtered thin film, and homemade polycrystalline material using laser desorption ionization (LDI) time of flight mass spectrometry with quadrupole ion trap mass spectrometry. It also analyzed the stoichiometry of the Sb m Se n clusters formed. The results showed th...
Article
This study compared Sb2Se3 material in the form of commercial polycrystalline bulk, sputtered thin film, and homemade polycrystalline material using laser desorption ionization (LDI) time of flight mass spectrometry with quadrupole ion trap mass spectrometry. It also analyzed the stoichiometry of the SbmSen clusters formed. The results showed that...
Article
Utilization of the N,C,N‐chelating ligand L (L={2,6‐(Me2NCH2)2C6H3}−) in the chemistry of 13 group elements provided either N→In coordinated monomeric chalcogenides LIn(μ‐E4) (E=S, Se) with unprecedented InE4 inorganic ring or monomeric chalcogenolates LM(EPh)2 (M=Ga, In). Complex LGa(SePh)2 was selected as the most suitable single source precursor...
Article
Full-text available
Amorphous chalcogenide thin films are widely studied due to their enhanced properties and extensive applications. Here, we have studied amorphous Ga-Sb-Se chalcogenide thin films prepared by magnetron co-sputtering, via laser ablation quadrupole ion trap time-of-flight mass spectrometry. Furthermore, the stoichiometry of the generated clusters was...
Article
Full-text available
Ge-Sb-Te thin films were obtained by ns-, ps-, and fs-pulsed laser deposition (PLD) in various experimental conditions. The thickness of the samples was influenced by the Nd-YAG laser wavelength, fluence, target-to-substrate distance, and deposition time. The topography and chemical analysis results showed that the films deposited by ns-PLD reveale...
Article
The aim of this work is to generate and study the clusters formed as a result of the interaction of laser pulses with solid state materials such as chalcogenide glasses. The other target is to determine the stoichiometry of the clusters generated from studied chalcogenide glasses and their thin films in order to get the information about structural...
Conference Paper
We report the experimental observation of plasmon-soliton waves. The demonstration is performed in a chalcogenide-based four-layer planar geometry. It reveals a plasmon-enhanced Kerr self- focusing undergone by a TM polarized beam propagating inside the structure.
Preprint
We report the experimental observation of plasmon-soliton coupling. The demonstration is performed in a chalcogenide-based four-layer planar geometry designed to limit plasmon propagation losses while exhibiting efficient Kerr self-focusing at moderate power. The observations reveal a strongly enhanced self-focusing undergone by a self-trapped beam...
Article
We study experimentally and theoretically the intensity-dependent off-resonant ultrafast third-order nonlinear optical response of AS2S2 thin films. At low intensity, we observed saturable absorption with a negative (self-defocusing) nonlinear refractive index (n2) which at higher inten- sity switched over to reverse saturable absorption with a cha...
Article
Full-text available
Chalcogenide glasses with a nominal composition of Ga5Ge20Sb10Se(65-x)Tex (x = 0, 10, 20, 25, 30, 32.5, 35, 37.5) were synthesized. Their physico-chemical properties, glass network structure and optical properties are clearly modified via the substitution of selenium by tellurium. Based on a detailed study of the Ga5Ge20Sb10Se(65-x)Tex bulk glasses...
Article
Our studies have been focused on the synthesis of N→Ga coordinated organogallium selenides and tellurides [L1Ga(μ‐Se)]2 (1), [L2Ga(μ‐Se)]2 (2) and [L1Ga(μ‐Te)]2 (3), respectively, containing either N,C,N‐ or C,N‐chelating ligands L1,2 (L1 is {2,6‐(Me2NCH2)2C6H3}‐ and L2 is {2‐(Et2NCH2)‐4,6‐tBu2‐C6H2}‐) having Ga/E (E = Se or Te) atoms in 1/1 ratio....
Article
Full-text available
With high refractive indices, appropriate solubility of rare earth, low phonon energy and transparency from the visible to 10 μm, a Ga-Ge-Sb-S system allows emission from Nd³⁺ ions in the near- and mid-IR spectral ranges. The glass transition temperature, density, expansion coefficient, and near and mid-IR refractive indexes were measured on bulk s...
Article
Pulsed laser deposition was used to prepare amorphous thin films from (GeSe2)100-x(Sb2Se3)x system (x = 0, 5, 10, 20, 30, 40, 50 and 60). From a wide variety of chalcogenide glass-forming systems, Ge-Sb-Se one, especially in thin films form, already proved to offer a great potential for photonic devices such as chemical sensors. This system has a l...
Article
Amorphous Ge–Sb–Se thin films were fabricated by a rf-magnetron co-sputtering technique employing the following cathodes: GeSe2, Sb2Se3 and Ge28Sb12Se60. The influence of the composition, determined by energy-dispersive X-ray spectroscopy, on the optical properties was studied. Optical properties were analyzed based on variable angle spectroscopic...
Article
Praseodymium-doped selenide thin films are deposited by radio frequency magnetron sputtering on thermally oxidized silicon wafers and undoped selenide layers. Ridge waveguides are then processed using photolithography and dry etching techniques. Under optical pumping at 1.55 μm, broadband guided mid-infrared photoluminescence is recorded for the fi...
Article
We present a reliable and original experimental technique based on the analysis of beam self-trapping to measure ultrafast optical nonlinearities in planar waveguides. The technique is applied to the characterization of Ge–Sb–Se chalcogenide films that allow Kerr induced self-focusing and soliton formation. Linear and nonlinear optical constants of...
Article
Pulsed laser deposition exploiting a KrF excimer laser was used to fabricate amorphous As-S thin films from bulk As2S3 glass target. Thickness profile of the film was extracted from variable angle spectroscopic ellipsometry data. The dependence of thickness distribution of prepared thin layer on laser beam plume deflection angle was evaluated and c...
Article
Laser desorption ionization using time-of-flight mass spectrometer afforded with quadrupole ion trap was used to study As2Ch3 (Ch = S, Se, and Te) bulk chalcogenide materials. The main goal of the study is the identification of species present in the plasma originating from the interaction of laser pulses with solid state material. The generated cl...
Article
Full-text available
The detection of molecules dissolved in liquid medium can be envisaged by means of an optical integrated sensor operating in middle infrared range. The intended sensor is composed of a cladding and a guiding selenide sputtered layers transparent in middle infrared. Hence, Ge-Sb-Se thin films were selected in view of tailored refractive index contra...
Article
Full-text available
The development of the optical bio-chemical sensing technology is an extremely important scientific and technological issue for diagnosis and monitoring of diseases, control of industrial processes, environmental detection of air and water pollutants. Owing to their distinctive features, chalcogenide amorphous thin films represent a keystone in the...
Conference Paper
Full-text available
Development of Mid-infrared sensors for the detection of biochemical molecules is a challenge of great importance. Mid-infrared range (4000 – 400 cm-1) contains the absorption bands related to the vibrations of organic molecules (nitrates, hydrocarbons, pesticides, etc.). Chalcogenide glasses are an important class of amorphous materials appropriat...
Article
AsxTe100-x amorphous thin films were fabricated by a pulsed laser deposition technique with the aim of finding photostable layers in as-deposited but preferably in relaxed (annealed) state. Photostability was studied in terms of the films' stability of refractive index and bandgap under nearbandgap light irradiation. As40Te60 and As50Te50 layers we...
Article
Compositional and fabrication method dependences of laser-induced geometrical surface relief formation in GeSe amorphous layers were investigated with the aim to determine the possible role of initial conditions in the mechanism and efficiency of optical recording. The results show that pulsed laser deposition has some advantages in composition pre...
Article
Zinc acetate dihydrate, lithium hydroxide monohydrate, and anhydrous ethanol as starting compounds are used for the synthesis of Li containing zinc oxide nanoparticles with different emission colours. The emission colour depends on addition of lithium hydroxide and changes from cyan to green-yellow. Photoluminescence spectra of synthesised nanopart...
Conference Paper
Selenide ridge waveguide based on evanescent field detection was designed, fabricated and optically characterized in mid-infrared (7.7 μm). Results represent the first development step of an integrated optical sensor for pollutant detection in water.
Article
This work is aimed at the hybrid free radical-cationic polymerization of acrylate, epoxide, and oxetane monomers. Studied hybrid systems were prepared as mixtures of binders polymerizing via free radical mechanism (pentaerythritol triacrylate, thioacrylate dendritic oligomer) and binders polymerizing through cationic mechanism (3, 4-epoxycyclohexyl...
Article
Our studies have been focused on the synthesis of NGa coordinated organogallium sulfides [L1Ga(-S)]3 (1) and [L2Ga(-S)]2 (2) containing either N,C,N- or C,N-chelating ligands L1,2 (L1 is {2,6-(Me2NCH2)2C6H3}- and L2 is {2-(Et2NCH2)-4,6-tBu2-C6H2}-). As the result of different ligand, compounds 1 and 2 differ mutually in their structure. To change...
Article
The dynamics and properties of the (GeSe2)100-x(Sb2Se3)x laser-induced plasma were investigated by fast ICCD imaging and space- and time-resolved optical emission spectroscopy (OES). The experiments were performed at 10⁻⁶ Torr background pressure, using the second harmonic (532 nm) of the Nd-YAG laser (10 ns, 10 Hz). For all investigated samples, t...
Article
This paper reports the fabrication of luminescent optical rib/ridge waveguides made of erbium doped Ga-Ge-Sb-S films deposited by RF magnetron sputtering. Several fluorescence emissions of Er3+ ions from the visible to the middle infrared spectral domain were clearly observed within the films. The study of the 4I13/2 level lifetime enabled developm...
Article
A micro-sensor based on selenide glasses for evanescent wave detection in mid-infrared spectral range was designed and fabricated. Ge-Sb-Se thin films were successfully deposited by radio-frequency magnetron sputtering. In order to characterize them spectroscopic ellipsometry, atomic force microscopy and contact angle measurements were employed to...