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Wyświetlanie 1-12 z 12
Tytuł:
Long Period Waveguide Gratings in Planar Gradient Waveguides
Autorzy:
Kotyczka, T.
Rogoziński, R.
Powiązania:
https://bibliotekanauki.pl/articles/1417993.pdf
Data publikacji:
2012-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.20.Fw
42.70.Ce
07.07.Df
42.79.Gn
Opis:
This paper introduces the application possibilities of long-period waveguide gratings in planar structures of gradient waveguides. The analysis of resonance possibilities of coupling modes in gradient-gradient structures was carried out. An original configuration of single-mode (gradient) structure and multimode decoupling area was proposed. The refractive properties of gradient areas were calculated on the basis of experimental data relating to the $Ag^{+}$ ↔ $Na^{+}$ ion exchange in soda-lime glass. The calculations of the resonance properties included the actual dispersion of the glass substrate. The influence of the ion exchange technological processes (diffusion, heating) on the character of the coupling modes' curves was also presented. The calculations indicate the possibility of obtaining these resonances in the wavelength range corresponding to the visible spectrum.
Źródło:
Acta Physica Polonica A; 2012, 122, 5; 841-846
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Planar Photonic Crystals Biosensor Applications of $TiO_2$
Autorzy:
Erdiven, U.
Karaaslan, M.
Unal, E.
Karadağ, F.
Powiązania:
https://bibliotekanauki.pl/articles/1418288.pdf
Data publikacji:
2012-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.67.Pt
42.70.Qs
07.07.Df
42.79.Pw
Opis:
We examine quality factor and sensitivity change depending on the resonant wavelength changing refractive index of surrounding liquid for $TiO_2$ photonic crystal slab structure. Photonic crystal slab structure is used widely for biological materials such as proteins, antigens, DNA, cells, virus particles and bacteria. Mentioned photonic crystal slabs are usable with large-area biosensor designs. They permit direct access to externally incident optical beams in a microfluidic device. Model calculations are based on two-dimensional periodic crystal structure. Photonic crystal slab consists of a square lattice of air holes in a finite-thickness dielectric slab. The time domain simulations were implemented by software MIT Electromagnetic Equation Propagation.
Źródło:
Acta Physica Polonica A; 2012, 122, 4; 732-736
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of Long Period Gratings in the Gradient Structures of Planar Waveguides
Autorzy:
Kotyczka, T.
Rogoziński, R.
Powiązania:
https://bibliotekanauki.pl/articles/1399379.pdf
Data publikacji:
2013-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.70.Ce
81.20.Fw
07.07.Df
42.79.Gn
Opis:
This paper introduces the application possibilities of long-period waveguide gratings produced in gradient structures of planar waveguides and their possible usage as the detectors of changes in the refractive index. The influence of technological processes and corrugation's parameters on the resonant characteristics and transmission spectrum (obtained by the numerical simulations) of such structures was presented. The influence of changes in the refractive index of the environment on the transmission spectral characteristics was shown. The possibilities of sensor applications of such structures was presented as well. The calculations were performed for two types of gradient waveguides' structures: produced in BK7 glass with the use of $K^+$ ↔ $Na^+$ ion exchange and produced in soda-lime glass with the use of $Ag^+$ ↔ $Na^+$ ion exchange.
Źródło:
Acta Physica Polonica A; 2013, 124, 3; 486-489
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sol-Gel Derived Sensitive Films for Ammonia Sensors
Autorzy:
Tyszkiewicz, C.
Karasiński, P.
Rogoziński, R.
Powiązania:
https://bibliotekanauki.pl/articles/1506869.pdf
Data publikacji:
2010-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.20.Fw
42.70.Ce
07.07.Df
Opis:
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.
Źródło:
Acta Physica Polonica A; 2010, 118, 6; 1262-1266
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design of Pressure Sensor Based on Two-Dimensional Photonic Crystal
Autorzy:
Zouache, T.
Hocini, A.
Harhouz, A.
Mokhtari, R.
Powiązania:
https://bibliotekanauki.pl/articles/1033334.pdf
Data publikacji:
2017-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.70.Qs
78.67.Pt
07.07.Df
42.79.-e
Opis:
In this work, we design a new pressure sensor based on two-dimensional photonic crystal waveguide coupled to a point-defect resonant microcavity. The mechanism of sensing is based on the change of the germanium refractive index as function of the hydrostatic pressure P. The resonant wavelength will shift when pressure variation induces change in the refractive indexes of the structure. The pressure variation causes the shifting of defect modes. The properties of the refractive index sensor are simulated using the finite-difference time-domain algorithm and the plane wave expansion method. These kinds of sensors have many advantages in compactness, high sensitivity, and various choices of materials.
Źródło:
Acta Physica Polonica A; 2017, 131, 1; 68-70
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Enhancement of Refractive Index Sensitivity in Photonic Crystal Waveguide-Based Sensors by Selective Infiltration
Autorzy:
Bagci, F.
Akaoglu, B.
Powiązania:
https://bibliotekanauki.pl/articles/1399501.pdf
Data publikacji:
2013-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.70.Qs
78.67.Pt
07.07.Df
42.79.-e
Opis:
We present a liquid refractive index sensor based on a photonic crystal waveguide slab structure. Sensing mechanism employed in this study is based on the shift in cut-off wavelength as the lattice holes are selectively infiltrated. Three-dimensional plane-wave expansion and finite-difference time-domain methods are used to determine the band structure and transmission spectra, respectively. First, the sensitivity of the device is analyzed for the structure where only the first rows of holes adjacent to the line-defect are infiltrated. In addition, this analysis is repeated for a range of hole diameters. Second, the effects of infiltrated holes which are placed in the line-defect are investigated. As these infiltrated central holes are introduced, the proposed device exhibits 5.3 times improved sensitivity.
Źródło:
Acta Physica Polonica A; 2013, 124, 1; 50-55
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sensitive Films for Optical Detection of Ammonia and Nitrogen Dioxide
Autorzy:
Tyszkiewicz, C.
Karasiński, P.
Rogoziński, R.
Powiązania:
https://bibliotekanauki.pl/articles/1418064.pdf
Data publikacji:
2012-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.20.Fw
42.70.Ce
07.07.Df
Opis:
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 $NO_2$.
Źródło:
Acta Physica Polonica A; 2012, 122, 5; 915-920
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of the Heating Processes on the Modal Attenuation Distribution in Planar Gradient Waveguides
Autorzy:
Kotyczka, T.
Rogoziński, R.
Powiązania:
https://bibliotekanauki.pl/articles/1493246.pdf
Data publikacji:
2011-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.20.Fw
42.70.Ce
07.07.Df
Opis:
In this paper the influence of the heating processes on modal attenuation distribution in planar gradient waveguides produced by ion exchange method in soda-lime glass-$Ag^{+}$ admixture arrangement is presented. The influence of heating processes on modal attenuation distribution in dependence on preliminary refractive profile shape was analysed. Numerical simulations were based on experimentally gained thermal diffusion coefficients of the exchanged ions.
Źródło:
Acta Physica Polonica A; 2011, 120, 4; 671-677
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Temperature Cross-Sensitivity for Highly Refractive Index Sensitive Nanocoated Long-Period Gratings
Autorzy:
Grochowski, J.
Myśliwiec, M.
Mikulic, P.
Bock, W.
Śmietana, M.
Powiązania:
https://bibliotekanauki.pl/articles/1399344.pdf
Data publikacji:
2013-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.70.Ce
42.79.Gn
07.07.Df
81.20.Fw
Opis:
There is a demand for highly refractive index sensitive devices simultaneously insensitive to temperature (T) changes. We investigate both T and refractive index sensitivity of long-period gratings coated with 100 nm thin high refractive index (n ≈ 1.9 at λ = 1550 nm) silicon nitride $(SiN_{x})$ film. The long-period gratings with period of 500 μm were induced in standard Corning SMF28 fibre using electric arc and nanocoated with $SiN_{x}$ by radio frequency plasma enhanced chemical vapour deposition method. As a sensorial effect we investigated resonance shift with temperature variations (from 30 to 70°C) for measurement in deionized water ($n_{D}$ = 1.33) and glycerine ($n_{D}$ = 1.46). In case of measurements in water for resonance observed at λ = 1510 nm, refractive index sensitivity of - 85 nm/RIU and temperature sensitivity of 0.09 nm/C $(H_2O)$ were obtained which gives refractive index-T sensitivity ratio (RI/T) of - 944°C/RIU. Refractive index and T sensitivity of sensor covered with $SiN_{x}$ film increased to - 618 nm/RIU and 0.22 nm/°C, respectively. Thanks to nanocoating deposition, refractive index-T sensitivity ratio was improved by factor of 3. In case of measurements in glycerine significant influence of glycerine's thermo-optic coefficient on obtained results was observed. It is worth noticing that $SiN_{x}$ coating stabilizes sensing behaviour of the sensor.
Źródło:
Acta Physica Polonica A; 2013, 124, 3; 421-424
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Silicon Nitride Overlays Deposited on Optical Fibers with RF PECVD Method for Sensing Applications: Overlay Uniformity Aspects
Autorzy:
Michalak, B.
Koba, M.
Śmietana, M.
Powiązania:
https://bibliotekanauki.pl/articles/1400502.pdf
Data publikacji:
2015-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.07.Df
42.70.Ce
42.79.Gn
81.20.Fw
Opis:
This work discusses uniformity of overlays deposited with radio frequency plasma enhanced chemical vapor deposition method on a core of partly uncoated multimode polymer-clad silica optical fiber. Although the method provides uniform films on flat surfaces, uniformity of deposition on optical fibers suspended in plasma is questionable. In this work we investigate optical-fiber-based structures coated with high-refractive-index ($n_{D}$> 2.3) silicon nitride ($SiN_{x}$) where lossy mode resonance phenomenon appears. Experimental studies, where the fiber is rotated by 90° and 180°, are compared to those where the sample has not been rotated between the depositions. Deposition process time for all samples has been adjusted in order to obtain the same thickness of overlays on all the fibers. The experimental data has been supported by numerical simulations. The experiment has shown that the rotation modifies transmission of the $SiN_{x}$-coated fiber structure, as well as its response to external refractive index. As an effect of rotation we observed shift of the resonance appearing at about λ =600 nm towards shorter wavelengths and reduction in amount of the resonances. However, the resonances appearing in transmission spectrum for sample with no rotation show the highest refractive index sensitivity reaching about 690 nm per refractive index unit.
Źródło:
Acta Physica Polonica A; 2015, 127, 6; 1587-1591
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Planar Evanescent Wave Ammonia Sensor - Influence of Refractive Index Profile on Sensor Properties
Autorzy:
Karasiński, P.
Tyszkiewicz, C.
Rogoziński, R.
Powiązania:
https://bibliotekanauki.pl/articles/1493230.pdf
Data publikacji:
2011-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.20.Fw
42.70.Ce
07.07.Df
Opis:
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.
Źródło:
Acta Physica Polonica A; 2011, 120, 4; 651-656
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Wet Etching of Arc-Induced Long-Period Gratings on Their Refractive Index Sensitivity
Autorzy:
Myśliwiec, M.
Grochowski, J.
Krogulski, K.
Mikulic, P.
Bock, W.
Śmietana, M.
Powiązania:
https://bibliotekanauki.pl/articles/1399391.pdf
Data publikacji:
2013-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.70.Ce
42.79.Gn
07.07.Df
81.20.Fw
Opis:
The paper presents highly refractive index sensitive operation of long-period gratings enhanced by wet etching of the fiber cladding. Long-period gratings with period of 283 μm were induced in Corning SMF28 optical fibre using electric arc technique. Then etching in hydrofluoric (HF) acid solution has been applied to improve operation of the sensor. Sensitivity improvement effect induced by fiber cladding reduction has been numerically simulated. The developed numerical model enables quick estimation of cladding thickness reduction essential to achieve dispersion turning point. At this point long-period gratings reaches maximum sensitivity to external medium refractive index. Simulation showed that dispersion turning point for this long-period grating is achieved by cladding thickness reduction of 1.7 μm. We obtained good simulation match with experimental results, where approximately the same thickness was etched. The refractive index sensitivity of the long-period grating-based sensor has been improved by factor of 5. Since long-period grating period is limited when using electric arc fabrication method, this physical limitation makes difficult achievement of dispersion turning point and reaching maximum sensitivity of the long-period grating. We show that sensitivity of electric arc induced long-period grating can be significantly improved by post processing techniques such as wet etching.
Źródło:
Acta Physica Polonica A; 2013, 124, 3; 521-524
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-12 z 12

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