Temat: DF - Katalog OPAC zbiorów

Skocz do pozycji: 1.

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

Skocz do pozycji: 2.

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

Skocz do pozycji: 3.

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

Skocz do pozycji: 4.

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

Skocz do pozycji: 5.

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

Skocz do pozycji: 6.

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

Skocz do pozycji: 7.

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

Informacja