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1
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Silica-Titania Films Fabricated by Sol-Gel Method for Applications in Planar Photonics

100%
Karasiński P.
Acta Physica Polonica A
|
2009
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vol. 116
|
issue S
S-114-S-116
EN
The work presents silica films produced with sol-gel method of extremely different refractive indices as well as two-component waveguide films SiO_{2}:TiO_{2} of very low attenuation.
2
Content available remote

Planar Optical Waveguide Sensor Structures with Grating Couplers

100%
Karasiński P.
Acta Physica Polonica A
|
2009
|
vol. 116
|
issue S
S-30-S-32
EN
The paper presents optical planar waveguide sensor structures with grating couplers of groove density χ = 2400 g/mm. The waveguide films were obtained using sol-gel method, in which the grating couplers were fabricated by the embossing method. The results of theoretical analysis as well as the results of experimental research have been presented.
3
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Sol-Gel Derived Sensitive Films for Ammonia Sensors

51%
Tyszkiewicz C., Karasiński P., Rogoziński R.
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|
issue 6
1262-1266
EN
The sol-gel technology allows the preparation of silica thin films ranging in porosity from dense to highly porous films (50%). Porous silica films can function as a matrix that is able to bind the molecules of pH-sensitive indicators and therefore can be utilized as a sensitive film in construction of intensity based fibre or planar optical sensors for ammonia detection. We report the fabrication and characterization of ammonia sensitive, highly porous silica films deposited on soda-lime glass plates and doped with the bromocresole purple, and bromothymol blue molecules. In this paper we present the influence of the substrate withdrawal speed from sol on a thickness and a refractive index of the undoped silica films, as well as spectral absorbance characteristics of the doped films. An influence of ammonia concentration in air and relative humidity on a transmission of produced sensitive films is also presented.
4
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Ellipsometric and Spectrophotometric Investigations of Porous Silica Thin Films Produced by Sol-Gel Method

51%
Skoczek E., Jaglarz J., Karasiński P.
Acta Physica Polonica A
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2011
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vol. 120
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issue 4
732-735
EN
The work presents the optical properties of porous silica thin films prepared by TEOS sol-gel method. The films were deposited onto glass substrate using dip-coating technique. The spectroscopic ellipsometry measurements have been performed to determine the optical constants of the films. This technique also enabled evaluation of the depolarization for the investigated layers. Additionally, the spectrophotometric measurements of transmittance and reflectance by the use of integrating sphere and reflectance probe have been made with the aim of possible application of the films as antireflective coatings.
5
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Sensitive Films for Optical Detection of Ammonia and Nitrogen Dioxide

51%
Tyszkiewicz C., Karasiński P., Rogoziński R.
Acta Physica Polonica A
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2012
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vol. 122
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issue 5
915-920
EN
The sol-gel technology allows preparation of the thin silica films ranging in porosity from dense to highly porous. These films can function as matrix binding molecules of pH-sensitive indicators and can be utilized as sensitive coatings for intensity based planar evanescent wave chemical sensors. This paper is devoted to manufacturing technology and characterization of highly porous silica films deposited on soda-lime glass substrates, impregnated with bromocresole purple and cresole red. Two different methods of impregnation were used: dip coating, which entails sensitization of both silica films deposited on each side of a substrate and selective deposition of a dye solution on single side of the substrate. Manufactured sensitive films were tested toward influence of gaseous ammonia and nitrogen dioxide on their spectral characteristics of the absorption coefficient and the imaginary part of the refractive index. It was shown that bromocresole purple allows detection of both gases: NH_3 and NO_2.
6
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Single-Mode Rib Waveguides Fabricated by Means of Sol-Gel Method

51%
Karasiński P., Tyszkiewicz C., Rogoziński R.
|
EN
Rib waveguides were fabricated with the use of selective, wet chemical etching of two-component waveguide films SiO_2:TiO_2 which were obtained using sol-gel method. Photoresist was applied as a mask in the process. The etching of the films SiO_2:TiO_2 was carried out in water solution of ammonia fluoride. The paper presents the results of theoretical analysis as well as the power distributions in the fabricated strip waveguides.
7
Content available remote

Planar Evanescent Wave Ammonia Sensor - Influence of Refractive Index Profile on Sensor Properties

51%
Karasiński P., Tyszkiewicz C., Rogoziński R.
Acta Physica Polonica A
|
2011
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vol. 120
|
issue 4
651-656
EN
The paper presents the results of the investigations involving the influence of the change of launching conditions on the characteristics of the planar amplitude evanescent wave ammonia sensors. Investigated sensors are based on the channel gradient waveguides, which are produced with the application of the ion exchange in glasses. In our investigations we have tested two sensor structures of different refractive index profiles. The absorption sensitive films were produced using sol-gel technology.
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