Wyniki wyszukiwania - BazTech

1

Metoda wyznaczania współczynników załamania na powierzchniach granicznych warstw dielektrycznych z obwiedni charakterystyk odbiciowych

Krasiński P., Tyszkiewicz C., Skolik M., Błaszczyk T.

Przegląd Elektrotechniczny

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2018

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R. 94, nr 8

51--54

PL

W pracy przedstawiana jest nowa metoda wyznaczania wspólczynników załamania na powierzchniach granicznych warstw dielektrycznych z obwiedni ich widm odbciowych. Podawane są proste wzory na współczynniki załamania na powierzchniach granicznych warstwy, które weryfikowane są teoretycznie i eksperymentalnie. Wyliczone prezentowaną metodą współczynniki załamania używane były w obliczeniach widm odbiciowych, które porównywane są z wyjściowymi widmami eksperymentalnymi.

EN

The presentation shows the new method allowing determination of refractive indices at interfaces of dielectric films. The method is basing on the analysis of envelopes of reflectance spectra. In the presentation there are shown theoretical foundations of simple mathematical formulas, describing refractive index values at film interfaces as well as experimental results that postively verified our method. In the first step, values of the refractive index at films interfaces were determined using our method. In the second step, reflectance spectra were calculated using the values of refractive indices obtained in the first step and compared with measured ones

2

Homogeneous sensitivity of sol-gel derived planar waveguide structures - theoretical analysis

Tyszkiewicz C.

Optica Applicata

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2012

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Vol. 42, nr 3

555-569

EN

Rib waveguides are the key components of integrated optical devices including evanescent wave chemical and biochemical sensors. The sol-gel method allows the SiO2:TiO2 rib waveguides with very low attenuation to be fabricated by means of selective etching of the SiO2:TiO2 parent slab waveguides deposited on glassy substrates. The present work focuses on theoretical investigation into both the influence of selected rib waveguide geometrical parameters and wavelength on the homogeneous sensitivity of the rib waveguides. The homogeneous sensitivity spectral characteristics of rib waveguides are compared with the ones for the parent slab waveguides. Moreover, there is investigated the influence of additional, sol-gel based amorphous silica layer, which separates rib sidewalls from an ambient on effective index and homogeneous sensitivity characteristics. Analysis was carried out using effective index method.

3

Optical channel structures based on sol-gel derived waveguide films

Karasiński P., Tyszkiewicz C., Rogoziński R.

Optica Applicata

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2011

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Vol. 41, nr 2

351--357

EN

Rib waveguides were fabricated with the use of selective, wet chemical etching of two-component waveguide films SiO2:TiO2 which were obtained using the sol-gel method. Photoresist was applied as a mask in the process. The etching of the layers SiO2:TiO2 was carried out in water solutions of ammonia fluoride. The paper presents the results of theoretical analysis as well as the power distributions in the obtained strip waveguides and directional couplers.

4

Żebrowe światłowody paskowe do zastosowań sensorowych

Karasiński P., Rogoziński R., Tyszkiewicz C.

Pomiary Automatyka Kontrola

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2010

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R. 56, nr 6

541-543

PL

Zmiany efektywnych współczynników załamania w czujnikach światłowodowych pracujących w oparciu o spektroskopię pola zanikającego mierzone są z zastosowaniem sprzęgaczy siatkowych lub interferometrów. Podstawowym elementem interferometrów planarnych są światłowody paskowe. Przedstawiana praca dotyczy żebrowych światłowodów paskowych. Otrzymywane metodą zol-żel warstwy falowodowe SiO2:TiO2 są selektywnie maskowane z zastosowaniem tradycyjnej fotolitografii a następnie trawione chemicznie. W ten sposób zostały wytwarzane jednomodowe żebrowe światłowody paskowe i sprzęgacze kierunkowe. W pracy przedstawione są wyniki analizy teoretycznej światłowodów żebrowych i wyniki badań eksperymentalnych wytworzonych struktur.

EN

Basic elements of planar interferometers are the channel waveguides. Presented work refers to the channel rib waveguides. In our previous work [7] we offered the production method of rib channel waveguides with the application of traditional photolithography and wet chemical etching of sol-gel derived silica-titania waveguide films. In this work we present new results of our research on rib waveguides and directional couplers. The theoretical analysis of rib waveguides was presented as well as the results of experimental investigations on the fabricated structures. The investigations on channel waveguides of the rib height of 5 nm was carried out for wavelengths: λ=677 nm. The waveguide films used in rib waveguides manufacturing technology are characterized by high refractive index (˜1.8) and ultra-low attenuation of 0.15 dB/cm. Rib waveguides of width w<4 Μm are monomode. For the rib waveguides we obtained the attenuation of (1.5š0.1) dB/cm. Rib waveguides of such an attenuation can be applied in the technology of integrated optics systems in sensor applications, and in particular for the construction of interferometers of Mach-Zehnder, Young or Michelson. The improvement of technology, and in particular the improvement in the quality of photolithographic masks should contribute to further decrease of attenuation of the produced rib waveguides.

5

Warstwy sensorowe na bazie porowatej krzemionki do zastosowań w światłowodowych czujnikach amoniaku

Karasiński P., Tyszkiewicz C.

Elektronika : konstrukcje, technologie, zastosowania

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2010

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Vol. 51, nr 6

119-122

PL

W światłowodowych czujnikach chemicznych najczęściej jako warstwy sensorowe wykorzystywane są warstwy absorpcyjne, w których na skutek oddziaływania substancji chemicznej zmienia się absorpcja. Praca dotyczy technologii wytwarzania i właściwości absorpcyjnych warstw sensorowych do czujników amoniaku. Warstwy te zbudowane są z porowatej krzemionki, która jest matrycą wiążącą indykatory. Stosowanymi w badaniach indykatorami były; purpura bromokrezolowa i błękit bromotymolowy. Wysoka porowatość (∼50%) warstwy sensorowej sprzyja jej regeneracji. W pracy przedstawiono charakterystyki spektralne wytwarzanych warstw oraz wyniki badań ich właściwości sensorowych.

EN

Waveguide chemical sensors usually use sensitive films within which occur absorption phenomena. Absorption of light is a result of the interaction of sensed chemical substances with the molecules the films are composed off. Presented work is devoted to the fabrication technology and absorption properties of sensitive films designed for optical waveguide ammonia sensors. The films are made of porous silica, which is a matrix that bounds the pH indicators. In the scope of presented work, the bromocresol purple, and bromothymol blue were used as the indicators. The high porosity (50%) of sensing films fosters their regeneration. Spectral characteristics of fabricated films as well as the results of investigations on their sensing properties are presented in this work.

6

Multivariate analysis of signals from array of semiconductor gas sensors

Szpakowski A., Tyszkiewicz C., Pustelny T.

Elektronika : konstrukcje, technologie, zastosowania

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2008

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Vol. 49, nr 6

135-136

EN

High sensitivity, accuracy and stability as well as short response time characterize semiconductor, chemoresistive gas sensors. Such sensors are easy implementable in electronic circuits. The major constraint of this type of sensors is their poor selectivity. One method which allows to overcome this difficulty is utilization of pattern recognition methods applied to the response from the group of non-selective sensors. This work presents the response of the array of eight different FIGARO sensors to different gases as well as application of PCA as a feature extraction method for pattern recognition analysis.

PL

Półprzewodnikowe, chemorezystancyjne sensory gazowe charakteryzują się wysoką czułością, dokładnością, stabilnością, krótkim czasem odpowiedzi oraz łatwą implementacją w układach elektronicznych. Głównym ograniczeniem czujników tego typu jest ich słaba selektywność. Jednym ze sposobów na poprawę selektywności jest łączenie nieselektywnych czujników w grupy i analiza odpowiedzi utworzonej matrycy sensorów metodami rozpoznawania wzorców. W pracy przedstawiono odpowiedzi ośmiu różnych sensorów półprzewodnikowych FIGARO na zatrucie wybranymi gazami oraz wyniki zastosowania algorytmu PCA jako metody ekstrakcji cech dla metod rozpoznawania wzorców.

7

Impressing technology of optical Bragg's gratings on planar optical sol-gel waveguides

Pustelny T., Zielonka I., Tyszkiewicz C., Karasiński P., Pustelny B.

Opto-Electronics Review

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2006

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Vol. 14, No. 2

161-166

EN

The aim of the presented investigations was to develop a technique of producing Bragg's grating couplers on planar waveguides. Waveguides are obtained by means of the sol-gel technology. The introduction of a light beam into the structure of the waveguide is in the case of planar or strip optical systems always an essential technical problem, requiring simple and reproducible solutions without extending excessively the waveguide structure. The paper presents a technology of producing grating couplers by impressing the pattern of the network while forming the planar waveguide structure applying the sol-gel method. Some remarks concerning the sol-gel technology are also presented. The results of investigations on grating couplers obtained in such a way have been discussed, too. Attention has been drawn to the possibility of using such structures in optoelectronic sensors, particularly gas sensors, including sensors of water vapour as well as toxic gases.

8

Technology of Optical Bragg's Gratings on Planar Waveguides for Acoustooptic Applications

Pustelny T., Zielonka I., Tyszkiewicz C., Pustelny B., Jurusik J.

Molecular and Quantum Acoustics

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2005

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Vol. 26

217-226

EN

The aim of the presented investigations was to develop a technique of producing Bragg's gratings on planar waveguides for their application in acoustooptic structures. Waveguides are obtained by means of the sol-gel technology and they are deposited on piezoelectric plates. The introduction of a beam of light into the structure of the waveguide is in the case of planar or strip optical systems always an essential technical problem, requiring simple and reproducible solutions without excessive extending the waveguide structure. In the paper the technology of producing grating couplers by impressing the pattern of the network while forming the planar waveguide structure applying the sol-gel method was presented. The results of the investigations on grating couplers obtained in such a way have been discussed, too.

9

Determination of the Refractive Index of the Se1211 Resin Using an Spr Spectroscopy

Tyszkiewicz C., Maciak E., Karasiński P., Pustelny T.

Molecular and Quantum Acoustics

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2005

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Vol. 26

267-271

10

Differential interferometry in planar waveguide structures with ferronematic layer

Tyszkiewicz C., Pustelny T.

Optica Applicata

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2004

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Vol. 34, nr 4

507-514

EN

The paper presents a differential interferometry phenonenon in a planar optical structure, which uses a ferronematic layer of a liquid crystal. This layer changes propagation conditions for TM modes in external magnetic field. Due to the magnetic field action on a ferronematic layer whichcovers the planar waveguide coated with an additional orientative layer, the ellipsoid of the refractive index changes its orientation in a polarization plane of the TM mode. In consequence, the phase difference of the TM mode occurs under magnetic field influence. This paper provides an analysis of the influence of a thickness and a refractive index of the orientative layer on interference phenomenon in analyzed structure.

11

Optical fiber sensors of magnetic field applying Faraday’s effect

Pustelny T., Tyszkiewicz C., Barczak K.

Optica Applicata

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2003

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Vol. 33, nr 2-3

469-475

EN

This work presents a system for measuring magnetic field intensity. The idea of measurements is based on the influence of an external magnetic field on the polarization state of single-mode light propagated along optical fibers. In the paper, some experimental results of test investigations for the measurements of the magnetic field of high intensity are presented. The ultimate aim of the investigation outlined below is to work out magnetic field intensity sensors which, together with optical fiber temperature sensors and electric field intensity sensors, will make it possible, in the nearest future, to entirely monitor the operation of electromagnetic power units such as, e.g., high voltage power transformers

12

The New Method for Light Polarisation State Determination and Their Application for Magnetooptical Effect Investigations

Pustelny T., Tyszkiewicz C., Barczak K.

Molecular and Quantum Acoustics

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2001

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Vol. 22

203-212

EN

This work presents the new method that allows determining the ellips of polarisation. Therefore is allows determining the state of polarisation. This paper also shows how apply presented mathod in designing the fiber optic magnetic field sensors.

13

Magnetooptic Effects and Possibility Their Application for Fiber Optic Sensor Technique

Pustelny T., Barczak K., Tyszkiewicz C.

Molecular and Quantum Acoustics

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2000

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Vol. 21

207-218

EN

In the work some magnetooptic effects were presented. More detail the phenomenon of optical birefringence was discussed. Among magnetic effects one distinguishes Faraday's effect, in which the direction of external magnetic field and light wave ii parallel and Cotion-Mutton effect where the above directions are perpendicular. Very interesting, for the sensor applications, are also magnetostriction effects. In the paper the discussion on possibility of application in sensor technigue the various magnetosensing materials was curry out.

14

Fiber Optic Magnetic Field Sensors

Pustelny T., Tyszkiewicz C., Barczak K.

Molecular and Quantum Acoustics

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2000

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Vol. 21

219-227

EN

In the work arę presented the methods of magnetic field intensity in which optic fibers are used. In the sensors of this kind the magnetooptic effects are applied, flrst of all the Faraday 's, Cotton-Mouton as well as magnetostriction effects, too. The paper includes also the results ofown imestigations the sensors based on polarimetric effect.