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Wyświetlanie 1-15 z 35
Tytuł:
Optical Nonreciprocal Devices and their Applications
Autorzy:
Krasiński, J. S.
Pearson, G. W.
Powiązania:
https://bibliotekanauki.pl/articles/1931528.pdf
Data publikacji:
1994-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.79.-e
Opis:
Construction, background and applications of optical nonreciprocal devices are discussed. Operation of optical isolators and circulators based on Faraday polarization rotation is analyzed. Applications of the nonreciprocal devices for multipass amplifiers are presented. Construction of polarization independent circulators is discussed including an all fiber circulator and application of the circulators for fiberoptics communications is included.
Źródło:
Acta Physica Polonica A; 1994, 86, 1; 245-255
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Low-Coherence Fibre-Optic Interferometric Sensors
Autorzy:
Jedrzejewska-Szczerska, M.
Gnyba, M.
Kosmowski, B.
Powiązania:
https://bibliotekanauki.pl/articles/1493198.pdf
Data publikacji:
2011-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.79.-e
42.81.Pa
Opis:
In this paper low-coherence fibre-optic sensors based on the Fabry-Perot and Michelson interferometer, which were designed and elaborated at our laboratory, are shown. We present results of investigation of the fibre-optic sensors working in both configurations. These results allowed us to compare properties of sensors working in both configurations. The theoretical analysis and experimental results made us possible to select best construction, which was implemented in low-coherence fibre-optic sensors of refractive index.
Źródło:
Acta Physica Polonica A; 2011, 120, 4; 621-624
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical Investigation of Hematocrit Level in Human Blood
Autorzy:
Jedrzejewska-Szczerska, M.
Gnyba, M.
Powiązania:
https://bibliotekanauki.pl/articles/1493214.pdf
Data publikacji:
2011-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.79.-e
42.81.Pa
Opis:
In this paper use of selected optical methods of a hematocrit measurement has been presented. Elaborated methods have numerous advantages: relatively simple configurations, potentially low cost and high resolution. Investigation confirmed their ability to determine the hematocrit value with appropriate measurement accuracy. Furthermore, simultaneous use of complementary optical methods can substantially increase measurement reliability, because low-coherence interferometric measurement is based on physical (mainly optical) properties of the investigated object, while Raman spectroscopy is based on study of its molecular composition.
Źródło:
Acta Physica Polonica A; 2011, 120, 4; 642-646
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improved Methods of Signal Processing Used in Low-Coherent Systems
Autorzy:
Jedrzejewska-Szczerska, M.
Powiązania:
https://bibliotekanauki.pl/articles/1811551.pdf
Data publikacji:
2008-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.79.-e
42.81.Pa
Opis:
In this article the author presents improved techniques of signal processing used in low-coherent measurement systems. The author proposes to utilize the synthesized sources in the system with the temporal signal processing. It will be shown that the exploit of such a source can substantially reduce the signal-to-noise ratio required to identify the central fringe position. In case of using spectral signal processing, the author proposes to control the position of maximum in the spectral pattern which modifies the phase difference between interfering beams. The results of experimental works will show that described techniques can be an effective method for improving the signal processing in low-coherent measurement systems.
Źródło:
Acta Physica Polonica A; 2008, 114, 6A; A-127-A-131
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cross-Sectional Imaging of Materials Structure Using PS-OCT
Autorzy:
Strąkowski, M.
Pluciński, J.
Kosmowski, B.
Powiązania:
https://bibliotekanauki.pl/articles/1811558.pdf
Data publikacji:
2008-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.79.-e
42.87.-d
Opis:
Optical low-coherence tomography is a measurement technique for non-contact and non-destructive investigation of materials inner structure. Nowadays, this method is highly applied in medical treatment especially in dermatology and ophthalmology. During our research we have developed an optical low-coherence tomography system with polarization state analysis for structure examination of a broad range of technical materials. In this paper we present our recent measurements including polarization sensitive analysis. Those measurements were taken for semitransparent and highly scattering materials like polymer layers and polymer optical retarders, anticorrosion protective coatings or abrasive paper. We proved that with the aid of developed polarization sensitive optical coherence tomography system it is possible to investigate birefringence principles of materials as well as to improve visualization contrast of cross-sectional images.
Źródło:
Acta Physica Polonica A; 2008, 114, 6A; A-217-A-221
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Applications of Gradient Index Multimode Interference Structures in the Technology of Optical Sensor
Autorzy:
Szewczuk, A.
Błahut, M.
Powiązania:
https://bibliotekanauki.pl/articles/1493261.pdf
Data publikacji:
2011-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.79.Gn
42.82.Ds
42.79.-e
Opis:
The aim of the work is the presentation of operating principle and properties of multimode interference structure devices made in gradient index technology by $K^{+}$ and $Na^{+}$ ion exchange method from the point of view of optical sensor design. Numerical analysis was performed using beam propagation method. Analyzed sensor structures are covered by nanolayers whose refractive index higher than the multimode interference section index is the reason for the concentration of wave propagation energy in the sensor layer area and its vicinity. Modifications of external propagation conditions change the refractive index and extinction coefficient of a sensor layer. The variation of optical properties leads to the modification of waveguiding conditions in the multimode interference coupler.
Źródło:
Acta Physica Polonica A; 2011, 120, 4; 740-743
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Model of Optical Sensor on the Base of MMI Structures
Autorzy:
Szewczuk, A.
Błahut, M.
Pyka, W.
Powiązania:
https://bibliotekanauki.pl/articles/1506864.pdf
Data publikacji:
2010-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.79.Gn
42.82.Ds
42.79.-e
Opis:
The paper presents the research on waveguide sensors based on multimode interference structures. In the modeled systems, the applied sensor layer was used as the cover of the multimode section. The cover of the multimode section can be made of material sensitive to the changes of definite external conditions, and through a proper selection of this material the sensor can be adapted to the detection of various physicochemical quantities. In effect of the changes of optical parameters of the sensor layer, the propagation conditions change, which can be easily observed in the location changes of N-fold images of the input field. In the paper we have investigated and compared the systems based on waveguides having step index profile and gradient distribution of refractive index. We have demonstrated that the sensitivity of such systems can be adjusted through a proper selection of the dimensions of the multimode section.
Źródło:
Acta Physica Polonica A; 2010, 118, 6; 1250-1253
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multimode Interference Structures of Variable Geometry for Optical Sensor Application
Autorzy:
Szewczuk, A.
Błahut, M.
Powiązania:
https://bibliotekanauki.pl/articles/1506866.pdf
Data publikacji:
2010-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.79.Gn
42.82.Ds
42.79.-e
Opis:
The paper presents the analysis results of a waveguide sensor based on multimode interference structures. The multimode section was covered with sensor material. The change of optical parameters of the cover entails the change of propagation conditions of light in the structure. By measuring the light intensity at the output of the structure, we can define external physicochemical parameters to which the sensor layer is sensitive. The paper presents the method to adjust the sensitivity of the device through a proper selection of the thickness of the particular layers of multimode waveguides. We present, among others, the analysis results of optical systems whose parameters of the sensor layer corresponded with the parameters of wolfram oxide $(WO_3)$, being the material frequently applied as a gas-sensitive layer in gas sensors. We have proposed a configuration of a sensor based on the Mach-Zehnder interferometer whereof one arm is a multimode section and the other one a single mode waveguide. The detection method was narrowed down here to the measurement of phase difference between the waves propagating in the respective arms.
Źródło:
Acta Physica Polonica A; 2010, 118, 6; 1254-1258
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Gradient Index Multimode Interference Structures - Technology and Applications
Autorzy:
Błahut, M.
Kasprzak, D.
Powiązania:
https://bibliotekanauki.pl/articles/1795781.pdf
Data publikacji:
2009-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.79.Gn
42.82.Ds
42.79.-e
Opis:
The aim of this paper is to present the operating principles and properties of gradient index multimode interference structures made by $K^{+}-Na^{+}$ ion exchange in glass and their basic applications in optoelectronic circuits. The investigations of multimode interference structures were performed applying a method based on the visualization of light distribution in gradient structures, using fluorescence of the substance covering the multimode interference structures section. Basing on the above we present gradient index multimode interference structures applications in splitters and couplers 1× N technology of different configurations.
Źródło:
Acta Physica Polonica A; 2009, 116, 3; 257-260
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multi-Electrode Tapered Waveguide Structure for Quantum-Dot Semiconductor Optical Amplifiers
Autorzy:
Abedi, K.
Mohadesrad, E.
Powiązania:
https://bibliotekanauki.pl/articles/1399959.pdf
Data publikacji:
2013-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.50.-p
42.30.Lr
42.79.-e
Opis:
In this paper, by employing two practical methods of multi-electrode design and tapered waveguide structure, compensation techniques to restore declining carrier density along the quantum dot semiconductor optical amplifier's waveguide are investigated. In the multi-electrode method, the effects of distributing current via electrodes on the gain and the cross-gain modulation for two, three and four-electrode structures are studied. These characteristics are also investigated for the quantum dot semiconductor optical amplifiers with a tapered waveguide structure for the first time, including waveguides with different profiles and width ratios. After due comparison between these two methods, optimum parameters of the two techniques will be used simultaneously along each other to form a combined method. Through these design developments, gain as the main feature of the quantum dot semiconductor optical amplifiers continuously increases, though cross-gain modulator results show that there is a trade-off between the modulation efficiency and improving structure capability of restoring carrier density.
Źródło:
Acta Physica Polonica A; 2013, 123, 2; 411-414
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Polarization Sensitive Optical Coherence Tomography with Spectroscopic Analysis
Autorzy:
Strąkowski, M.
Pluciński, J.
Kosmowski, B.
Powiązania:
https://bibliotekanauki.pl/articles/1493325.pdf
Data publikacji:
2011-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.79.-e
42.87.-d
42.79.Sz
42.79.Ta
Opis:
The optical coherence tomography is an optical measurement technique used for investigation of wide range of scattering or semitransparent materials. The optical coherence tomography enables surface and subsurface examination of different types of materials to be performed in non-contact and non-destructive way. Our research have been concentrated on optical coherence tomography systems with polarization sensitive analysis. Such a combination of optical measurements methods improves optical coherence tomography visualization contrast and also delivers some extra information about investigated devices. However, applying polarization sensitive analysis is associated with problems related to the use of ultra broadband optical sources. We have managed studies on the improvement of signal processing method. According to obtained results the problem of signal processing method in polarization sensitive optical coherence tomography can be solved by the use of the spectroscopic analysis. In this paper we present a brief discussion about the polarization sensitive optical coherence tomography measurements supported by spectroscopic analysis of backscattered light from investigated device.
Źródło:
Acta Physica Polonica A; 2011, 120, 4; 785-788
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Quality Factor in 2D Anisotropic Photonic Crystal Cavity
Autorzy:
Bouleghlimat, O.
Hocini, A.
Powiązania:
https://bibliotekanauki.pl/articles/1401226.pdf
Data publikacji:
2015-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.70.Qs
42.82.Et
42.79.-e
Opis:
This work focuses on the study of the influence of geometrical parameters on the quality factor of a cavity H1, realized with one missing hole in the center. For obtaining the H1 characteristics and the band structure of the photonic crystal, the finite difference time domain (FDTD) method, which is based on solving Maxwell's equations in a spatially and temporally discretized domain, and plane wave expansion (PWE) method, which is a resolution method of Maxwell equations in the frequency domain, were used respectively. In this method, one simulates a space of theoretically infinite extent with a finite computational cell. The quality factor increases until a maximum value equal 1.23×10⁶ for a filling factor r/a=0.44, and then decreases to a value of 3.39×10⁵ for a filling factor r/a=0.47.
Źródło:
Acta Physica Polonica A; 2015, 127, 4; 976-978
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of the Absorption in Solar Cells with 2D Photonic Crystals
Autorzy:
Ouanoughi, A.
Hocini, A.
Khedrouche, D.
Powiązania:
https://bibliotekanauki.pl/articles/1192379.pdf
Data publikacji:
2015-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.70.Qs
42.79.-e
88.40.-j
Opis:
In this work, we design via numerical simulation the absorption properties of silicon nanohole arrays of vertically aligned square lattice arrays with lattice constants varying from 300 nm to 400 nm, using the finite difference time-domain method (FDTD). The silicon (Si) is chosen as prototype material for this study due to better understanding of the material properties and widely available optical data. The parameters for photonic crystals are optimized through computer simulations to obtain the maximum absorption and path length enhancement. We investigated the performance of the considered structure and determined the geometrical parameters that allow a better absorption.
Źródło:
Acta Physica Polonica A; 2015, 127, 4; 1205-1207
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical Diagnostic in Medicine - Needs and Possibilities
Autorzy:
Kasprzak, J.
Samsel, D.
Borkowska, A.
Kecik, M.
Powiązania:
https://bibliotekanauki.pl/articles/1493247.pdf
Data publikacji:
2011-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.30.Wb
87.57.-s
42.79.-e
42.79.Qx
Opis:
Methods of optical imaging used in medical diagnostic (with taking the newest diagnostic techniques into consideration in particular) have been presented. Selected optical characteristics of tissues having an influence on the range of the classical methods of the optical imaging have been discussed in detail. The respond to the classical method limitations was to use scanning methods and detection techniques consisting in three-dimensional imaging of tissue structures in real time. A specific eye structure allows the wide using of these techniques in ophthalmology. Such advantages like non-invasiveness, non-contactness and high resolution (guaranteeing the safety of a patient) show a huge success of these techniques. The results of the research (conducted in many research centers) point at the wider application possibility of optical scanning method in medical diagnostic.
Źródło:
Acta Physica Polonica A; 2011, 120, 4; 678-685
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tuning of Color Chromaticity of Light Emission from ZnSe Films Grown on a GaAs Substrate by Atomic Layer Epitaxy
Autorzy:
Skrobot, M.
Godlewski, M.
Guziewicz, E.
Kopalko, K.
Phillips, M. R.
Powiązania:
https://bibliotekanauki.pl/articles/2047005.pdf
Data publikacji:
2006-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.79.-e
78.66.-w
81.05.-t
Opis:
Monocrystalline films of sphalerite-type ZnSe were grown on GaAs(100) substrates from elemental Zn and Se precursors by atomic layer epitaxy in a gas flow system. Due to color mixing of band edge and deep defect-related emissions these layers emit intensive white light. Depth profiling cathodoluminescence indicates that green and red emissions mostly come from disordered regions of the films, close to the ZnSe/GaAs interface. We tested a possibility of tuning of chromaticity coordinates and of color temperature of the emission. We found that the chromaticity parameters (color perception) can be tuned by either regulating the appropriate accelerating voltage of electrons or current density of primary electrons in cathodoluminescence investigations. These properties of ZnSe films make them suitable for some practical applications as white light sources.
Źródło:
Acta Physica Polonica A; 2006, 110, 3; 359-367
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 35

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