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Tytuł:
Silicon Photonic Waveguides for Near- and Mid-Infrared Regions
Autorzy:
Stankovic, S.
Milosevic, M.
Timotijevic, B.
Yang, P. Y.
Teo, E. J.
Crnjanski, J.
Matavulj, P.
Mashanovich, G. Z.
Powiązania:
https://bibliotekanauki.pl/articles/2047873.pdf
Data publikacji:
2007-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.82.-m
42.82.Et
Opis:
The basic building block of every photonic circuit is a waveguide. In this paper we investigate the most popular silicon waveguide structures in the form of a silicon-on-insulator rib waveguide. We also analyse two structures that can find applications in mid- and long-wave infrared regions: free-standing and hollow core omnidirectional waveguides.
Źródło:
Acta Physica Polonica A; 2007, 112, 5; 1019-1024
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Grey Solitons in Saturable Media with Nonlinear Dispersion and Self-Frequency Shift
Autorzy:
Jasiński, J.
Powiązania:
https://bibliotekanauki.pl/articles/2035664.pdf
Data publikacji:
2003
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.65.Tg
42.82.Et
Opis:
In the paper a special form of the generalized nonlinear Schrödinger equation in saturable medium with nonlinear dispersion and the self-frequency shift terms is considered. The solutions describing both the intensity and phase profiles of grey solitons propagating in this medium are obtained. Four cases of medium with or without saturation and with or without higher order terms are considered. For a square-two-level model of saturation analytical explicit solutions are derived. The relations between the medium and propagation parameters of solitons are discussed.
Źródło:
Acta Physica Polonica A; 2003, 103, 2-3; 149-160
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bright and Dark Solitons in Generalized Kerr-Like Media
Autorzy:
Jasiński, J.
Powiązania:
https://bibliotekanauki.pl/articles/2015082.pdf
Data publikacji:
2001-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.65.Tg
42.82.Et
Opis:
In the paper the propagation of short pulses in nonlinear Kerr-like medium is considered. Pulses are described by the nonlinear Schrödinger equation in which the generalization of nonlinear dispersion term and the self-frequency shift are taken into account. The solution of the equation in the form of quadrature is derived. Both the phase and profile of the pulse intensity are obtained. The cases of propagating bright and dark solitons in saturable Kerr-like medium are analyzed. Two models of saturation are considered. The explicit analytical expressions describing the Kerr limit are reported. The relations between the medium and propagation parameters are thoroughly discussed.
Źródło:
Acta Physica Polonica A; 2001, 99, 1; 77-86
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Two-Wave Multi/Demultiplexer on the Base οf Gradient Index Multimode Interference Structures Made by $Ag^{+}-Na^{+}$ Ion Exchange
Autorzy:
Błahut, M.
Bazan, K.
Powiązania:
https://bibliotekanauki.pl/articles/1795784.pdf
Data publikacji:
2009-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.79.Sz
42.82.Et
Opis:
The paper presents optimizing investigations by the beam propagation method method of two-wave multi/demultiplexer which uses gradient index multimode interference structures made by $Ag^{+}-Na^{+}$ ion exchange in BK-7 glass. We have discussed the influence of the structure geometry and technological process parameters for selected wavelength combinations within the range of 635÷ 850 nm. We have described operating parameters of the multiplexers - excess losses and contrasts. We have also presented the way of finding approximate MMI section widths and lengths which satisfy the multiplexing condition.
Źródło:
Acta Physica Polonica A; 2009, 116, 3; 264-267
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Čerenkov Waveguide SHG: a Less Critical Way to Reach the Efficiency Peak
Autorzy:
Kotačka, L.
Čtyroký, J.
Hoekstra, H. J. W. M.
Powiązania:
https://bibliotekanauki.pl/articles/2015113.pdf
Data publikacji:
2001-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.65.Ky
42.82.Et
Opis:
It is well known that the conversion efficiency of the SHG in the Čerenkov regime in a waveguide with a nonlinear substrate exhibits a very sharp peak. Its position in a "pump wavelength-guide thickness" diagram follows a modified dispersion relation. A particular material combination exactly determines both the pump wavelength and the guide thickness. The existence of the peak was also experimentally proved with relatively high normalised conversion efficiency of 210%/(cm W). However, in order to achieve such a high conversion efficiency, the required tolerance in the guide thickness should be smaller than 0.5 nm (the FWHM of the peak is approximately 0.8 nm). The allowed variations in refractive indices are also very low (<10$\text{}^{-3}$). The recent theoretical study of the authors showed that an additional layer (idler) inserted into the waveguide facilitates more degrees of freedom which could relax the conditions for reaching the efficiency peak. This paper presents a detailed study of the behaviour of four-layer waveguide devices with a nonlinear substrate which promise a less constrained way to reach the efficiency peak.
Źródło:
Acta Physica Polonica A; 2001, 99, 1; 135-146
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Theoretical Analysis of the TE Mode Cerenkov Type Second Harmonic Generation in Ion-Implanted X-Cut Lithium Niobate Planar Waveguides
Autorzy:
Du, G.
Li, G.
Zhao, S.
Qiao, W.
Yang, K.
An, J.
Li, M.
Wang, J.
Wang, W.
Powiązania:
https://bibliotekanauki.pl/articles/1808109.pdf
Data publikacji:
2009-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.72.Dd
42.82.Et
Opis:
We present a study of the Cerenkov configuration second harmonic generation in X-cut ion-implanted lithium niobate waveguides. An approximate solution of conversion efficiency is given and plotted which shows that it is very sensitive to the waveguide depth and pump wavelength. The results can be used in the design of waveguides for the efficient second harmonic generation in the Cerenkov configuration.
Źródło:
Acta Physica Polonica A; 2009, 115, 3; 685-689
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mach-Zehnder Interferometer on the Base of Gradient Index Multimode Interference Structures
Autorzy:
Błahut, M.
Kasprzak, D.
Sujewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/1795783.pdf
Data publikacji:
2009-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.82.Ds
42.82.Et
42.79.Pw
Opis:
The paper presents the technology and testing measurements of Mach-Zehnder interferometer made by $K^{+}-Na^{+}$ ion exchange in glass. As a splitter and coupler of measuring and reference arms we used gradient index multimode interference structures in symmetrical configuration. The investigated interferometer, working in asymmetrical configurations, registers the phase shifts resulting from the changes of refractive index of the cover of both interferometer arms.
Źródło:
Acta Physica Polonica A; 2009, 116, 3; 261-263
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:
Waveguiding Effect in GaAs 2D Hexagonal Photonic Crystal Tiling
Autorzy:
Jovanović, Ð.
Gajić, R.
Djokić, D.
Hingerl, K.
Powiązania:
https://bibliotekanauki.pl/articles/1807811.pdf
Data publikacji:
2009-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.25.Bs
42.70.Qs
42.82.Et
Opis:
In this paper we theoretically study (with plane wave expansion and finite-difference time-domain models) waveguiding effect of the 2D hexagonal dielectric photonic crystal tiling. The structure is made of GaAs dielectric rods in air. We perform the calculations of the band structures, equi-frequency contours and electromagnetic propagation through the new type of the photonic crystal and self-collimation waveguides making it possible for application.
Źródło:
Acta Physica Polonica A; 2009, 116, 1; 55-57
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Steering and Locking of Discrete Solitons in Optical Waveguide Arrays
Autorzy:
Peschel, U.
Lederer, F.
Morandotti, R.
Aitchison, J. S.
Eisenberg, H.
Silberberg, Y.
Powiązania:
https://bibliotekanauki.pl/articles/2015072.pdf
Data publikacji:
2001-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.65.Tg
42.65.Wi
42.82.Et
Opis:
By operating an AlGaAs waveguide array at the half band gap, we experimentally demonstrate basic features of discrete systems, which do not appear in the corresponding continuous counterpart - the slab waveguide. Under selected initial conditions, we observed nonlinearly induced locking of an initially moving soliton to the input waveguide. If the power is even higher, originally locked beams start to move again, but in a direction opposite to the initial tilt.
Źródło:
Acta Physica Polonica A; 2001, 99, 1; 57-65
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of a Nanometric Layer with a High Refracting Index οn the Sensitivity οf the Difference Interferometer
Autorzy:
Gut, K.
Powiązania:
https://bibliotekanauki.pl/articles/1811550.pdf
Data publikacji:
2008-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.82.Et
07.07.Df
42.79.Pw
Opis:
Planar waveguides in which some range of the waveguide was modified by depositing on it a layer of some other dielectric, are called composite optical waveguides. Such a structure is based on a planar waveguide obtained by means of ion exchange $K^+-Na^+$ on glass, and covered by an adequately profiled dielectric layer. This kind of structure is of much interest due to considerable possibilities of taking measurements, which may contribute to a further development of the optoelectronic sensor. Especially required are sensor systems in chemistry, biochemistry, biotechnology, and others. Investigations on the properties of composite layers constitute a continuation of investigations concerning the construction of interferometers, which are very sensitive, cheap and easy to be produced.
Źródło:
Acta Physica Polonica A; 2008, 114, 6A; A-121-A-126
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Planar Optical Waveguide Sensor Structures with Grating Couplers
Autorzy:
Karasiński, P.
Powiązania:
https://bibliotekanauki.pl/articles/1807603.pdf
Data publikacji:
2009-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.62.Eh
42.79.Dj
42.82.Et
42.82.Gw
Opis:
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.
Źródło:
Acta Physica Polonica A; 2009, 116, S; S-30-S-32
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Single-Mode Rib Waveguides Fabricated by Means of Sol-Gel Method
Autorzy:
Karasiński, P.
Tyszkiewicz, C.
Rogoziński, R.
Powiązania:
https://bibliotekanauki.pl/articles/1506795.pdf
Data publikacji:
2010-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.82.Et
81.20.Fw
07.07.Df
Opis:
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.
Źródło:
Acta Physica Polonica A; 2010, 118, 6; 1168-1170
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Researches on the Spectral Transmittance of Zinc Oxide ZnO Semiconductor Layers
Autorzy:
Struk, P.
Pustelny, T.
Opilski, Z.
Powiązania:
https://bibliotekanauki.pl/articles/1506851.pdf
Data publikacji:
2010-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.25.Hz
42.25.-p
42.82.Et
68.35.Ct
Opis:
The paper deals with investigations concerning a wide-band gap material, viz. zinc oxide ZnO. Special attention has been devoted to the determination of the spectral transmission of zinc oxide layers deposited on quartz substrates. These investigations have made it possible to determine the optical spectral range in which this material is transparent as well as the edges of absorption. The presented investigations are valuable particularly concerning the application of zinc oxide in optoelectronic and photonic structures as well as in systems of waveguides and sensor layers of integrated optics.
Źródło:
Acta Physica Polonica A; 2010, 118, 6; 1239-1241
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Gas Sensors Based on ZnO Structures
Autorzy:
Struk, P.
Pustelny, T.
Gołaszewska, K.
Borysiewicz, M.
Piotrowska, A.
Powiązania:
https://bibliotekanauki.pl/articles/1399403.pdf
Data publikacji:
2013-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.25.Hz
42.25.-p
42.82.Et
68.35.Ct
Opis:
The paper presents the results of investigations concerning sensor structures based on porous layers of zinc oxide (ZnO) sensitive to a selected gaseous environment. The investigations comprised analyses of the influence of the gaseous environment on the optical properties of a sensor structure, in particularly on the change of the spectral characteristics of optical transmission within the range of ultraviolet light and in the visible range. These presented investigations were carried out in such a gaseous environment as nitrogen dioxide $NO_2$ in synthetic air.
Źródło:
Acta Physica Polonica A; 2013, 124, 3; 567-569
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 25

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