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    Wyświetlanie 1-11 z 11
    Tytuł:
    Nonlinear Properties of Waveguides with Twisted Nematic Liquid Crystal
    Autorzy:
    Karpierz, M. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2015119.pdf
    Data publikacji:
    2001-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.65.Wi
    42.70.Df
    Opis:
    Optical reorientational nonlinearity in twisted nematic liquid crystalline planar waveguide is analyzed theoretically. It is shown that optical nonlinearity for guided modes in analyzed waveguides can be approximated by saturation nonlinearity. Predicted nonlinearity is large enough to observe effects like spatial solitons formation with milliwatts of light power.
    Źródło:
    Acta Physica Polonica A; 2001, 99, 1; 161-173
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Light Polarization on Reorientation Nonlinearity in Nematic Liquid Crystals
    Autorzy:
    Brzdąkiewicz, K. A.
    Karpierz, M. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2035686.pdf
    Data publikacji:
    2003
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.65.-k
    42.70.Df
    Opis:
    Nematic liquid crystals are characterized by a giant optical nonlinearity which has its origin in the molecular reorientational phenomenon. Uniqueness of this nonlinear mechanism causes that response of the medium is dependent on many conditions. Among various circumstances, both an initial alignment of liquid crystal cell and geometry of the system are very important, but in this paper a significant role of light polarization in nonlinear effects observed in nematics is emphasized. Additionally, it is underlined that dependence on light polarization does not have only trivial aspect of initial conditions. More complex seems to be the fact that due to the high optical anisotropy of the medium the state of light polarization is changing on the way of beam propagation. As a consequence, the modifications of molecular orientation in the liquid crystal cell are strongly dependent upon light polarization.
    Źródło:
    Acta Physica Polonica A; 2003, 103, 2-3; 195-205
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nonlinear Optical Measurements of Elastic Constants in Nematic Liquid Crystal
    Autorzy:
    Bajdecki, W. K.
    Karpierz, M. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2008272.pdf
    Data publikacji:
    1999-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.65.-k
    42.70.Df
    Opis:
    A new method of measurements of elastic constants of nematic liquid crystals by applying the nonlinear optical effect is presented. This method bases on measurements of a value of the reorientation threshold in a liquid crystal layer while the reorientation is induced by the light beam passing through the layer. The obtained results are in a qualitative compatibility with the results obtained by classical methods.
    Źródło:
    Acta Physica Polonica A; 1999, 95, 5; 793-800
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of External Electric Field on Time of Nonlinear Optical Reorientational Effect in Nematics
    Autorzy:
    Bajdecki, W. K.
    Karpierz, M. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2035684.pdf
    Data publikacji:
    2003
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.65.-k
    42.70.Df
    Opis:
    Nonlinear reorientation phenomena in nematic liquid crystals cause extremely large refractive index changes. However, this effect is relatively slow and the determination of the time necessary to appearing or disappearing of the nonlinear effect is an important issue. In this work we present measurements of the time of increasing the nematics reorientation induced by the light beam passing through the liquid crystalline layer. The influence of external low-frequency electric field suppressing reorientation is also reported. The obtained results describing relations between time and optical power of light as well as between time and external electric field intensity are in good agreement with theory.
    Źródło:
    Acta Physica Polonica A; 2003, 103, 2-3; 187-193
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modeling of Spatial Solitons in Twisted Nematics Waveguides
    Autorzy:
    Karpierz, M. A.
    Brzdąkiewicz, K. A.
    Nguyen, Q. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/2035666.pdf
    Data publikacji:
    2003
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.65.Wi
    42.70.Df
    Opis:
    Theoretical analysis of light beam propagation in twisted nematic liquid crystalline waveguides is presented. Due to the optical reorientation nonlinearity, the light beam changes the direction of propagation and optical spatial soliton is formed. Modeling of such behavior is presented by using (2+1)-dimensional vector beam propagation method as well as simplified (1+1)-dimensional method. Although both approaches give similar results, the differences are discussed in detail.
    Źródło:
    Acta Physica Polonica A; 2003, 103, 2-3; 169-175
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reorientational Nonlinear Phenomena in Thin Nematic Liquid Crystals Layer
    Autorzy:
    Brzdąkiewicz, K.
    Bajdecki, W. K.
    Kozanecka, A.
    Karpierz, M. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2023855.pdf
    Data publikacji:
    2001-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.65.-k
    42.70.Df
    Opis:
    In this paper the detailed study of the self-diffraction phenomena due to reorientational optical nonlinearity in nematic liquid crystalline cell is presented. The optical nonlinear effect is additionally modified by external low-frequency electric field. The dependence of nonlinear response on light polarization is also analyzed. The theoretical investigations are compared with experimental results and the theoretical predictions are in excellent agreement with experimental data.
    Źródło:
    Acta Physica Polonica A; 2001, 99, 1; 183-192
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Polarimetric Fiber Optic System for Static and Dynamic Strain Measurement
    Autorzy:
    Konopka, W.
    Woliński, T. R.
    Domański, A. W.
    Karpierz, M. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2023977.pdf
    Data publikacji:
    2001-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.81.Gs
    42.81.Pa
    Opis:
    Polarization properties of the transmitted optical signal in polarimetric fiber-optic sensing systems for dynamic strain measurements as well as for smart structures applications are presented. The smart structure consists of highly birefringent fiber embedded in an epoxy cylinder.
    Źródło:
    Acta Physica Polonica A; 2001, 99, 1; 207-212
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical Nonlinearity in Liquid Crystalline Optical Waveguides
    Autorzy:
    Karpierz, M. A.
    Domański, A. W.
    Sierakowski, M.
    Świłło, M.
    Woliński, T. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2008217.pdf
    Data publikacji:
    1999-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.65.Wi
    42.70.Df
    Opis:
    The analysis of optical orientational nonlinearity in nematic liquid crystalline planar waveguides is presented. The analyzed nonlinearity leads to unique properties that are not observed in other types of nonlinear waveguides. Theoretical results are confirmed by experimental data obtained in liquid crystalline directional couplers and in the self-focusing effect observed in the planar liquid crystalline waveguides.
    Źródło:
    Acta Physica Polonica A; 1999, 95, 5; 783-792
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Nature of Potential Fluctuations in the MBE CdTe/CdMgTe Quantum Well in a Magnetic Field: Experiment and Theory
    Autorzy:
    Szot, M.
    Karpierz, K.
    Avetisyan, A. A.
    Djotyan, A. P.
    Kossut, J.
    Grynberg, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047014.pdf
    Data publikacji:
    2006-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.55.Gs
    72.15.Rn
    72.80.Ey
    73.21.Fg
    Opis:
    Far infrared photoconductivity spectra of CdTe/Cd$\text{}_{0.8}$Mg$\text{}_{0.2}$Te quantum well uniformly n-type doped with iodine in barriers and in the well were investigated as a function of the magnetic field. The spectra were recorded for several fixed far infrared photon energies and peaks corresponding to intra donor transitions were observed. The magnetic field at which the peaks were observed was the same for all far infrared photon energies used. This is interpreted as an evidence of the presence of fluctuations of the electrostatic potential - quantum dots which reduce the dimensionality of the potential in which a shallow donor is placed. A characteristic size of the fluctuations was found to be of 23-25 nm and 30-40 nm. Theoretical calculations show a nonmonotonic dependence of the electron binding energy on the donor centre in such quantum dot, as a function of magnetic field. This explains why the position of experimentally observed peak is insensitive to far infrared photon energy used. Temperature evolution of spectra and the theoretical model proposed, indicate similarities between fluctuations in the two-dimensional structure investigated and fluctuations in bulk systems.
    Źródło:
    Acta Physica Polonica A; 2006, 110, 3; 379-387
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    ESR Spectroscopy of Graphene with Adsorbed NaCl Particles
    Autorzy:
    Karpierz, E.
    Drabińska, A.
    Bożek, R.
    Kaźmierczak, P.
    Wysmołek, A
    Kamińska, M
    Strupiński, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1376214.pdf
    Data publikacji:
    2014-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.ue
    72.10.Fk
    78.67.Wj
    72.80.Vp
    Opis:
    Due to its peculiar properties graphene is a good candidate for sensor materials. Therefore, it is important to study influence of different fluids on graphene layer. The presented studies showed pinning of NaCl microcrystals to graphene surface after immersing graphene in NaCl solution and subsequent careful rinsing with distilled water. The atomic force microscopy images revealed presence of many NaCl-related structures over 100 nm high on graphene surface. The electron spin resonance spectrum for magnetic field perpendicular to the graphene layer consisted of several lines originating from NaCl. The pinning of NaCl microcrystals resulted in increase of electron scattering, as confirmed by the Raman spectroscopy (the increase of intensity of D and D' bands) and weak localization measurement (the decrease of coherence length).
    Źródło:
    Acta Physica Polonica A; 2014, 126, 5; 1187-1189
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Terahertz Detection by the Entire Channel of High Electron Mobility Transistors
    Autorzy:
    Sakowicz, M.
    Łusakowski, J.
    Karpierz, K.
    Knap, W.
    Grynberg, M.
    Köhler, K.
    Valusis, G.
    Gołaszewska, K.
    Kamińska, E.
    Piotrowska, A.
    Caban, P.
    Strupiński, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811985.pdf
    Data publikacji:
    2008-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.75.+a
    78.20.Ls
    85.30.Tv
    07.57.Kp
    Opis:
    GaAs/AlGaAs and GaN/AlGaN high electron mobility transistors were used as detectors of THz electromagnetic radiation at liquid helium temperatures. Application of high magnetic fields led to the Shubnikov-de Haas oscillations of the detection signal. Measurements carried out with a simultaneous modulation of the intensity of the incident THz beam and the transistor gate voltage showed that the detection signal is determined by the electron plasma both in the gated and ungated parts of the transistor channel. This result is of importance for understanding the physical mechanism of the detection in high electron mobility transistors and for development of a proper theoretical description of this process.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 5; 1343-1348
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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