Wyniki wyszukiwania - BazTech

1

Szybkie wykrywanie wirusa grypy we wczesnej fazie rozwoju za pomocą sensorów nanodiamentowych domieszkowanych borem

Nidzworski Dawid, Siuzdak Katarzyna, Niedziałkowski Paweł, Bogdanowicz Robert, Sobaszek Michał, Ryl Jacek, Weiher Paulina, Sawczak Mirosław, Wnuk Elżbieta, Goddard William A., Jarmillo-Botero Andres, Ossowski Tadeusz, Gnyba M.

Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne

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2022

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nr 3

80--82

PL

Przedstawiono konstrukcję i wyniki wstępnych badań szybkiego elektrochemicznego sensora wykonanego na bazie cienkich warstw nanokrystalicznego diamentu domieszkowanego borem, który umożliwia wykrywanie śladowych ilości wirusa grypy we wczesnej fazie rozwoju. Zapewnia to identyfikację ognisk pandemii.

EN

The paper is a presentation of the construction and preliminary research results of a fast electrochemical sensor based on boron-doped nanocrystalline thin diamond layers, which enables the detection of traces of influenza virus in the early stages of development. It allows for the identification of pandemic outbreaks.

2

Gas composition inﬂuence on the properties of boron-doped diamond ﬁlms deposited on the fused silica

Dec B., Ficek M., Rycewicz M., Macewicz Ł., Gnyba M., Sawczak M., Sobaszek M., Bogdanowicz R.

Materials Science Poland

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2018

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Vol. 36, No. 2

288--296

EN

The main subject of this study are molecular structures and optical properties of boron-doped diamond films with [B]/[C]ppm ratio between 1000 and 10 000, fabricated in two molar ratios of CH4–H2 mixture (1 % and 4 %). Boron-doped diamond (BDD) film on the fused silica was presented as a conductive coating for optical and electronic purposes. The scanning electron microscopy images showed homogenous and polycrystalline surface morphology. The Raman spectroscopy confirmed the growth of sp3 diamond phase and sp2 carbon phase, both regular and amorphous, on the grain boundaries, as well as the efficiency of boron doping. The sp3/sp2 ratio was calculated using the Raman spectra deconvolution method. A high refractive index (in a range of 2.0 to 2.4 at λ = 550 nm) was achieved for BDD films deposited at 700 °C. The values of extinction coefficient were below 1.4 at λ = 550 nm, indicating low absorption of the film.

3

Examination of Sol-Gel Derived Hydroxyapatite Enhanced with Silver Nanoparticles using OCT and Raman Spectroscopy

Głowacki M. J., Gnyba M., Strąkowska P., Gardas M., Kraszewski M., Trojanowski M., Strąkowski M. R.

Metrology and Measurement Systems

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2017

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Vol. 24, nr 1

153--160

EN

Hydroxyapatite (HAp) has been attracting widespread interest in medical applications. In a form of coating, it enables to create a durable bond between an implant and surrounding bone tissues. With addition of silver nanoparticles HAp should also provide antibacterial activity. The aim of this research was to evaluate the composition of hydroxyapatite with silver nanoparticles in a non-destructive and non-contact way. For control measurements of HAp molecular composition and solvent evaporation efficiency the Raman spectroscopy has been chosen. In order to evaluate dispersion and concentration of the silver nanoparticles inside the hydroxyapatite matrix, the optical coherence tomography (OCT) has been used. Five samples were developed and examined ‒ a reference sample of pure HAp sol and four samples of HAp colloids with different silver nanoparticle solution volume ratios. The Raman spectra for each solution have been obtained and analyzed. Furthermore, a transverse-sectional visualization of every sample has been created and examined by means of OCT.

4

Portable Raman spectrometer - design rules and applications

Gnyba M., Smulko J., Kwiatkowski A., Wierzba P.

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2011

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Vol. 59, nr 3

325-329

EN

Raman spectroscopy has become more popular due to its new prospective field applications in forensic sciences, war against terrorism, environment protection and other field chemical analysis. Raman spectrometers can be miniaturised to portable devices and their price is decreasing due to development of optoelectronics components. Unfortunately, this technology has still numerous limitations that influence their design and limit the scope of possible applications. The conception and design of the portable Raman spectrometer is described, including discussion of performance and limitations of representative components of such device available on the market. An enhanced portable Raman spectrometer using two lasers, one emitting at 355 nm and the other at 785 nm, and employing advanced signal acquisition and data processing methods is presenented. Advantages of such system are outlined and example measurement results acquired using equivalent hardware are presented. Data processing flow for identification of chemicals is also described.

5

Detection of illicit chemicals by portable Raman spectrometer

Smulko J., Kwiatkowski A., Gnyba M.

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2011

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Vol. 59, nr 4

449-452

EN

The Raman spectrometers can be built as the portable devices and can be used in various places to detect illicit chemicals. This method has become popular due to deficiency of other fast methods that could be applied against terrorist attacks or could help police at their work. The Conception of a portable Raman spectrometer has been presented. The Description enclosures the presentation of the prepared device and its possible applications by presenting exemplary detection results.

6

Budowa i oprogramowanie przenośnego spektrometru Ramana

Kwiatkowski A., Gnyba M., Smulko J., Wierzba P.

Zeszyty Naukowe Wydziału ETI Politechniki Gdańskiej. Technologie Informacyjne

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2010

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T. 19

401-406

PL

W pracy przedstawiono budowę oraz zasadę działania przenośnego spektrometru Ramana, przygotowywanego w Katedrze Optoelektroniki i Systemów Elektronicznych Politechniki Gdańskiej. Opisano format plików *.SPC, który jest wykorzystywany przez oprogramowanie sterujące budowanym spektrometrem oraz stosowany przez większość komercyjnych aplikacji przeznaczonych do analizy widm Ramana. Przedstawiono podstawowe metody parametryzacji rejestrowanych widm, jakie się stosuje do automatycznej detekcji badanych substancji chemicznych.

EN

Design and operation principles of a portable Raman spectrometer have been presented. The spectrometer is in preparation in the Department of Optoelectronics and Electronics Systems. A file format *.SPC, used in Raman spectroscopy, has been described. The main methods of Raman spectra parameterization for automatic detection of chemicals has been enclosed as well.

7

Algorithms of chemicals detection using Raman spectra

Kwiatkowski A., Gnyba M., Smulko J., Wierzba P.

Metrology and Measurement Systems

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2010

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Vol. 17, nr 4

549-559

EN

Raman spectrometers are devices which enable fast and non-contact identification of examined chemicals. These devices utilize the Raman phenomenon to identify unknown and often illicit chemicals (e.g. drugs, explosives) without the necessity of their preparation. Now, Raman devices can be portable and therefore can be more widely used to improve security at public places. Unfortunately, Raman spectra measurements is a challenge due to noise and interferences present outside the laboratories. The design of a portable Raman spectrometer developed at the Faculty of Electronics, Telecommunications and Informatics, Gdansk University of Technology is presented. The paper outlines sources of interferences present in Raman spectra measurements and signal processing techniques required to reduce their influence (e.g. background removal, spectra smoothing). Finally, the selected algorithms for automated chemicals classification are presented. The algorithms compare the measured Raman spectra with a reference spectra library to identify the sample. Detection efficiency of these algorithms is discussed and directions of further research are outlined.

8

Monitoring ramanowski wzrostu cienkich warstw węglowych : studium

Gnyba M., Kozanecki M., Wroczyński P., Bogdanowicz R.

Elektronika : konstrukcje, technologie, zastosowania

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2010

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Vol. 51, nr 9

113-116

PL

Przedstawiono zagadnienie monitorowania in-situ próżniowego procesu wzrostu cienkich warstw węglowych, w szczególności diamentowych i diamentopodobnych DLC. Zastosowanie pomiarów ramanowskich umożliwia zbadanie struktury warstwy na poziomie molekularnym (zawartości faz węglowych: sp² i sp³, a także defektów wodorowych). Użycie spektroskopii ramanowskiej in-situ podczas procesu syntezy pozwala monitorować poprawność przebiegu procesu i opracować wytyczne do jego optymalizacji. W artykule przedstawiono konfiguracje układów optycznych, problemy doboru długości fali lasera oraz rezulaty prac eksperymentalnych

EN

In this paper we present selected problems referred to Raman in-situ monitoring of growth of carbon-based thin layers, especially - of diamond and diamond-like-carbon layers. Aplication of Raman measurements enables investigation of molecular composition of the layer (content of sp² and sp³ hybrydised carbon as well as presence of C-H defects). In-situ Raman monitoring enables also investigation of process progress and provides data useful for its optimisation. Setups of optical systems used in Raman spectroscopy, problems of exciation wavelengths selection and results experimental work are shown.

9

Optoelectronic system for investigation of CVD diamond/DLC layers growth

Wroczyński P., Bogdanowicz R., Gnyba M.

Advances in Materials Science

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2009

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Vol. 9, nr 3(21)

47-53

EN

Development of the optoelectronic system for non-invasive monitoring of diamond/DLC (Diamond-Like-Carbon) thin films growth during ěPA ECR CVD (Microwave Plasma Assisted Electron Cyclotron Resonance Chemical Vapour Deposition) process is described. The system uses multi-point Optical Emission Spectroscopy (OES) and long-working-distance Raman spectroscopy. Dissociation of H2 molecules, excitation and ionization of hydrogen atoms as well as spatial distribution of the molecules are subjects of the OES investigation. The most significant parameters of the deposited film like molecular composition of the film can be investigated by means of Raman spectroscopy. Results of optoelectronic investigation will enable improvement of CVD process parameters and synthesized DLC films quality.

10

System optoelektroniczny do kontroli procesów ΜPA CVD

Bogdanowicz R., Gnyba M., Wroczyński P., Leśniewski M.

Pomiary Automatyka Kontrola

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2008

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R. 54, nr 3

87-90

PL

Przedstawiono prototyp optoelektronicznego systemu do monitorowania in-situ procesu CVD, wspomaganych plazmą mikrofalową. System składa się z układu optycznej spektroskopii emisyjnej OES oraz specjalizowanego spektroskopu ramanowskiego RS. Umożliwia on równoczesne monito-rowanie składu plazmy oraz określanie dynamiki wzrostu i zawartości defektów warstwy. Przedstawiono wyniki badań przebiegu procesu wytwarzania warstw diamentopodobnych DLC. Wyniki monitorowania mogą być wykorzystywane do sterowania procesem.

EN

Prototype of optoelectronic monitoring system dedicated for in-situ diagnostics of microwave plasma assisted CVD processes was presented in this paper. The system uses optical emission spectroscopy OES and long-working-distance Raman spectroscopy RS. Such an approach enables simultaneous investigations of particle composition of the plasma and nucleation processes in the growing layer (growth ratio, phase defects). Thus, correlation between process parameters, plasma composition and layer quality can be determined. Results of investigation carried out for thin diamond-like-carbon DLC films synthesis process were presented. Obtained results can be used for efficient control of CVD process.

11

Optoelektroniczne narzędzia do badania in-situ przebiegu procesu syntezy cienkich warstw diamentopodobnych

Bogdanowicz R., Gnyba M., Wroczyński P.

Elektronika : konstrukcje, technologie, zastosowania

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2008

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Vol. 49, nr 11

80-83

PL

W artykule przedstawiono optoelektroniczny system do diagnostyki in-situ plazmowych procesów CVD, do wytwarzacienkich warstw diamentopodobnych. W systemie zastosowano rzestrzenną optyczną spektroskopię emisyjną SR-OES i spektroskopię ramanowską. Pozwala to na jednoczesne badanie rozkładu cząstek w plazmie i parametrów rosnącej warstwy. Opisano konstrukcję systemów pomiarowych, sprzegniętych z komorą CVD za pomocą dedykowanych torów światłowodowych. Zaprezentowano wyniki prac eksperymentalnych i interpretację danych pomiarowych.

EN

Optoelectronic system dedicated for in-situ diagnostics of plasma assisted CVD processes is presented in this paper. The system uses spatially resolved optical emission spectroscopy OES and Raman spectroscopy. Such an approach enables simultaneous investigations of particle composition of the plasma and performance of the growing layer. Design of measurement systems coupled with CVD chamber by dedicated fiber-optic paths is described. Results of experimental works are presented and analysis of obtained data is given.

12

WOPT - uniwersalny system do analizy i symulacji widm optycznych cienkich struktur dielektrycznych

Bogdanowicz R., Gnyba M., Wroczyński P., Torliński L.

Zeszyty Naukowe Wydziału ETI Politechniki Gdańskiej. Technologie Informacyjne

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2007

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T. 14

573-580

PL

Przedstawiono system WOPT umożliwiający symulację złożonych, dielektrycznych powłok cienkowarstwowych. Oprogramowanie służy zarówno do projektowania specjalistycznych wielowarstwowych powłok optycznych jak i do kontroli parametrów gotowych produktów cienkowarstwowych. Za pomocą programu można wykonać analizę grubości oraz optycznych parametrów materiałowych powłok dielektrycznych na postawie wykonanych pomiarów spektralnych. Wykonano badania efektywności algorytmu dla rzeczywistych pomiarów spektrometrycznych. Potwierdzono możliwość wyznaczania grubości struktur umieszczonych w próżni, w cieczach oraz osadzonych na podłożach o różnej grubości. Wykonano badania wpływu parametrów algorytmu na szybkość i dokładność obliczeń widm optycznych, grubości oraz optycznych parametrów warstw.

EN

The WOPT software enabling the simulation optical spectrums of thin dielectric layers was described. The soft-ware serves both for designing specialist multilayered optical covers and for the control of parameters of thin-layered products. With the help of the program it is possible to carry out analysis of the thickness and optical solid material dielectric covers of spectral measurements on the attitude carried out. Examining the effectiveness of the algorithm was carried out using spectral measurements. The possibility of estimation of the thickness of structures was confirmed in the vacuum, in liquids and prisoners on different substrates with the various thicknesses. The influence investigation of parameters of the algorithm on the speed and the accuracy of calculations of optical spectrums, thickness and solid optical a layers were made.

13

Synteza warstw diamentowych do zastosowań optoelektronicznych

Wroczyński P., Gnyba M., Herman A., Bogdanowicz R.

Elektronika : konstrukcje, technologie, zastosowania

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2007

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Vol. 48, nr 9

42-45

PL

Diamenty stosowane w optoelektronice i sensoryce syntetyzowane są w próżni przy użyciu plazmy niskotemperaturowej. Nanostruktury powstają przez wzrost struktur z molekuł, a nawet atomów. Wytwarzanie nanostruktur wymaga precyzyjnego monitoringu procesu syntezy. Optoelektroniczne metody pomiarowe zapewniają kontrolę wzrostu warstw oraz ocenę in-situ parametrów materiałowych. Przedstawiono optoelektroniczne metody badania przebiegu procesu syntezy warstw diamentowych i DLC: spektroskopię ramanowską oraz optyczną spektroskopię emisyjną.

EN

Diamonds for optoelectronics and sensor applications are synthesised in vacuum process using low-temperature plasma. Nanostructures grow from molecules or even from atoms. Manufacturing of nanostructures requires precise monitoring of the synthesis process. Optoelectronic measurement methods enable control of the films growth as well as in-situ investigation of the material parameters. In this paper, we presented optoelectronic methods which can be used in investigation of synthesis process of diamond and DLC films: Raman spectroscopy and optical emission spectroscopy.

14

Raman modular system with fibre-optic probes for remote monitoring of CVD process

Gnyba M., Bogdanowicz R., Wroczyński P.

Problemy Eksploatacji

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2006

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nr 4

115-127

EN

Dedicated Raman system was designed for in-situ monitoring of thin film growth in CVD (chemical vapour deposition) process. Review of monitoring requirements and limiting factors is given in this paper. Computer simulation of laser beam propagation in the CVD chamber and the thin film was carried out. Components for Raman optical probes and their configuration were selected using results of the modelling. Ex-situ investigation of the thin films enabled determination of the Raman scattering intensity. The prototype of the modular Raman system using fibre-optic probes was built. Efficiency of optical signal transmission through the probes was tested.

PL

W artykule przedstawiono projekt systemu ramanowskiego do monitorowania in-situ wzrostu cienkich warstw w procesie CVD i analizę związanych z tym problemów metrologicznych. Na podstawie wyników modelowania komputerowego wprowadzania wiązki laserowej do komory i jej propagacji w cienkiej warstwie wytypowano optymalną konfigurację optyczną systemu ramanowskiego i określono parametry optyczne jego elementów. Zbudowano prototyp modułowego wyposażonego w sondy światłowodowe. Wykonano pomiary wstępne obejmujące badania ex-situ generacji sygnału ramanowskiego w wybranych materiałach oraz testy sondy nadawczej na stole optycznym.

15

Raman system for on-line monitoring and optimisation of hybrid polymer gelation

Gnyba M., Keränen M., Maaninen A., Suhonen J., Jędzrzejewska-Szczerska M., Kosmowski B. B., Wierzba P.

Opto-Electronics Review

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2005

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Vol. 13, No. 1

9--17

EN

Authors designed and built a Raman spectroscopic system for non-invasive, remote, on-line monitoring of gelation, which is the first step of a sol-gel process used for synthesis of hybrid polymers for photonics. The system was connected with typical glass reaction vessel. Suitable design of an optical system reduced excitation of interfering Raman signal in the wall of the reactor. Application of two excitation wavelengths reduced influence of fluorescence on measurements and provided high efficiency of the Raman system in wide range extending from 200 to 3500 cm⁻¹. Synthesised materials were based on silane precursors having epoxy and amino functionality. Raman spectroscopy enabled strict control over molecular structure of the materials during the polymerization process. Time and efficiency of monomers hydrolysis were measured. Products of this reaction were evaluated. The obtained data enabled us optimisation of the process parameters which ensured high efficiency of hydrolysis and subsequent control of solution viscosity. Moreover, behaviour of amine groups and epoxy rings was investigated and influence of water and solvents was found.

16

Spectroscopic Studies of Sol-Gel Derived Thin-Film Structures for Integrated Optics

Gnyba M., Kozanecki M., Wierzba P.

Molecular and Quantum Acoustics

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2005

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Vol. 26

81-89

EN

Optical methods were applied to investigate sol-gel derived, thin-film components for integrated optics. Raman microscopy yielded information about molecular composition of materials, efficiency of reactions and thickness profile of the structures. Spectroscopic reflectometry, optical microscopy, and low-coherent profilometry confirmed dimensions and shape of the structures.

17

Raman system for monitoring dye dopingto hybrid polymer network

Gnyba M., Keränen M.

Materials Science Poland

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2005

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Vol. 23, No. 1

41--48

EN

Being a relatively low-temperature technique, the sol-gel technology enables the synthesis of hybrid polymers doped by organic dyes. In order to ensure the required properties of the final product, however, the mixing of sol and dye must be strictly controlled to avoid unwanted chemical reactions between them. Raman spectroscopic in-situ monitoring of the process was used to address this problem. Problems encountered in spectroscopic studies of non-transparent dye-doped sols, arising from intensive scattering, attenuation of the Raman signal inside the investigated material, and fluorescence induced by the laser beam, are discussed. The Raman measuring system constructed for the research presented in this paper uses a diode laser and a compact spectrometer connected to a reaction glass vessel by a fibre optic probe. Proper selection of the excitation beam wavelength and suitable design of the opto-mechanical setup results in an increase of the Raman signal and improved rejection of interfering signals. The system presented does not require access inside the vessel. In-situ monitoring was carried out for the process conducted at room temperature and up to 87 ?C. As the intensity of the Raman bands assigned to the dye did not change during the process, it can be concluded that dye does not decompose.

18

Raman investigation of hybrid polymer thin films

Gnyba M., Keranen M., Kozanecki M., Kosmowski B. B.

Materials Science Poland

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2005

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Vol. 23, No. 1

29--39

EN

Raman spectroscopic studies were carried out for hybrid polymer thin films prepared for photonic applications by the sol-gel technology. Our aims were to analyse the ability of the Raman method toestimate the efficiency of the main reactions of the sol-gel process and to provide information about the chemical composition of the films as well as their thickness, profile, and quality. The difficulties in measurement such as low level of Raman signals, difficulties in data analysis caused by the complex structure of the materials, and the influence of interfering signals, are discussed. The application of Raman microscopy for characterising films based on 3-glycidoxypropyl-trimethoxysilane (GPTS), methacryloxypropyltrimethoxysilane (MPTS), and 3-aminopropyl-trimethoxysilane (APTES) is presented. The efficiencies of reactions of inorganic and organic polymerisation were measured and their products have been identified. The influence of the excitation beam wavelength as well as the type of substrate on the Raman spectra was investigated. Moreover, two-dimensional Raman mapping enabled us to record the thickness profiles of the deposited structures and to detect their defects.

19

Optoelektroniczne metody pomiaru grubości cienkich transparentnych warstw wytwarzanych w procesach próżniowych

Bogdanowicz R., Gnyba M., Wroczyński P.

Elektronika : konstrukcje, technologie, zastosowania

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2004

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Vol. 45, nr 2

25-31

PL

W artykule opisano problemy związane z określeniem grubości cienkich transparentnych warstw dielektrycznych, syntetyzowanych w procesach próżniowych. Przedstawiono stosowane metody pomiarowe, szczególny nacisk kładąc na techniki optoelektroniczne oparte na badaniu interferencji i zmiany stanu polaryzacji światła w wyniku oddziaływania z cienką warstwą oraz na analizie spektralnej.

EN

The paper describes problems that should be considered during the thickness investigation of thin, transparent, dielectric film, that are synthesized using vacuum systems. The most common used measurement methods are presented, but optoelectronic methods based on light interference on the sample spectral analysis and change of polarization of light illuminate the sample were the main topic.

20

Diagnostyka procesu CVD metodą optycznej spektroskopii emisyjnej

Wroczyński P., Gnyba M., Bogdanowicz R.

Elektronika : konstrukcje, technologie, zastosowania

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2004

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Vol. 45, nr 10

17-18

PL

Zastosowano optyczną spektroskopię emisyjną do badania w trybie in-situ dysocjacji cząsteczek oraz wzbudzenia i jonizacji atomów wodoru podczas procesu syntezy cienkich warstw diamentowych metodą chemicznego osadzania par gazowych, wspomaganego plazmą mikrofalową (uPACVD).Tor światłowodowy umożliwia sprzęgnięcie komory CVD z systemem spektroskopowym i wykonywanie pomiarów bezinwazyjnych. Wykonano pomiary spektralne w zakresie światła widzialnego - bliskiej podczerwieni i zbadano zależność natężenia linii serii Balmera od parametrów procesu technologicznego.

EN

Optical Emission Spectroscopy (OES) was applied to in-situ investigation of hydrogen exciatation and ionization degree during Microwave Plasma Assisted Chemical Vapour Deposition (uPACVD) of thin diamond films. Fibre optic coupling between CVD chamber and spectroscopic system enables remote, non-invasive process monitoring. Authors made measurements in VIS-near UV range, thus investigating intensity of hydrogen lines assigned to Balmer serie as a function of CVD pocess parameters.