Autor: Sek, T - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Optical Properties of Semiladder Polymer Foils
Autorzy:: Jarząbek, B.
Orlik, T.
Cisowski, J.
Schab-Balcerzak, E.
Sęk, D.
Powiązania:: https://bibliotekanauki.pl/articles/2014521.pdf
Data publikacji:: 2000-11
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 78.40.Me
71.20.Rv
Opis:: Optical transmission of amorphous polyimidazopyrrolone foils (pyrrons) were investigated in the spectral range 200-3300nm. The investigated materials exhibit a high transmission level (up to 85%) in a wide range from about 500 to 2750nm. The short wavelength edge of transmission depends on the pyrron chemical structure being different for ether-, amide- and ester bridges. When analysing the experimental data, we applied the approach used for amorphous materials in order to determine the electronic structure parameters which may be related to the influence of polyimidazopyrrolone bridge structure and structural disorder on the optical properties and probable electronic transitions.
Źródło:: Acta Physica Polonica A; 2000, 98, 5; 655-659
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Influence of Built-in Electric Field on Forbidden Transitions in In_xGa$\text{}_{1-x}$As/GaAs Double Quantum Well by Three-Beam Photoreflectance
Autorzy:: Sęk, G.
Ryczko, K.
Misiewicz, J.
Bayer, M.
Wang, T.
Forchel, A.
Powiązania:: https://bibliotekanauki.pl/articles/2028844.pdf
Data publikacji:: 2001-09
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 73.20.-r
78.66.-w
Opis:: Photoreflectance spectroscopy has been used to study optical transitions in In$\text{}_{0.045}$Ga$\text{}_{0.955}$As/GaAs double quantum well at 80 K. The derivative nature of this contactless electromodulation technique allows for the observation of excited state transitions in the low-dimensional structure including the symmetry-forbidden ones. Excitonic symmetry-forbidden transitions can be observed due to the effect of mixing of heavy and light hole excitons and/or due to some asymmetry in the structure. We have shown that the built-in electric field in the region of double quantum well is weak enough (less than 0.5 kV/cm) not to cause any significant energetic shift of features due to quantum confined Stark effect, on one hand. On the other hand, it is sufficient to change strongly the oscillator strength of forbidden transitions. To change the internal electric field, we have used photoreflectance in the three-beam mode with a third beam continuously illuminating the sample and causing changes of the built-in electric fields due to the photovoltage effect. This method works as a contactless forward bias and allows for a change of the field down to the flat band conditions. We have shown that changes of built-in electric field by amount of a few tenths of kV/cm can modify the intensity of forbidden transitions significantly. We show that, although the mixing of excitons is still important, a very weak built-in electric field can be dominant in the observation of forbidden excitonic transitions in double quantum well.
Źródło:: Acta Physica Polonica A; 2001, 100, 3; 417-424
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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