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Wyświetlanie 1-15 z 19
Tytuł:
Time-Resolved Emission from Semiconductor Microcavities
Autorzy:
Kłopotowski, Ł.
Viña, L.
Kavokin, A.
Dang, L. S.
André, R.
Powiązania:
https://bibliotekanauki.pl/articles/2038372.pdf
Data publikacji:
2004-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.36.+c
71.55.Gs
78.47.+p
Opis:
We present a time-resolved study of the light emission of a CdTe-based microcavity. In the nonlinear regime, under high excitation conditions, in the strong coupling regime, we observe pronounced beats of the intensity of the photoluminescence arising from the bottleneck region of the exciton-polariton band. These beats are very sensitive to the excitation density and vanish under weak pumping conditions. We attribute the beats to a new nonlinear coupling mechanism of optically active and dark crystal states, related to polariton-polariton scattering, which leads to mixing between bright and dark states.
Źródło:
Acta Physica Polonica A; 2004, 106, 3; 435-442
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Recurrence of Stachybotrys chartarum during mycological and toxicological study of bioaerosols collected in a dairy cattle shed
Autorzy:
Lanier, C.
Andre, V.
Sequin, V.
Heutte, N.
El Kaddoumi, A.
Bouchart, V.
Picquet, R.
Garon, D.
Powiązania:
https://bibliotekanauki.pl/articles/50811.pdf
Data publikacji:
2012
Wydawca:
Instytut Medycyny Wsi
Opis:
Agricultural occupations associated with animal breeding and the processing of animal materials in confinement systems could potentially lead to bioaerosol exposures. Moulds and mycotoxins could be constituents of bioaerosols and should be studied because of their possible involvement in respiratory diseases and cancers. In order to characterize the fungal contamination of the indoor air in a dairy barn, bioaerosols were collected during 20 days in a cattle farm located in Normandy (France). Mycobiota, mycotoxins and the mutagenicity of bioaerosols were studied. The toxigenic ability of Aspergillus flavus group and Aspergillus fumigatus isolates was also evaluated in vitro. The prevalent airborne moulds were from the following potentially toxigenic species: Aspergillus flavus group, Aspergillus fumigatus, Penicillium chrysogenum, Stachybotrys chartarum, and the allergenic species Ulocladium chartarum, Cladosporium cladosporioides. In comparison with harvesting, grain handling or broiler breeding, the concentrations of viable moulds were lower in the cattle shed. Seasonal variations in levels of several species were also observed. This study revealed that aflatoxins were detected in bioaerosols and, for the first time, showed that farmers are possibly exposed to Stachybotrys chartarum during routine barn work. Moreover, the finding of mutagenicity from bioaerosols needs further investigations on bioaerosol composition.
Źródło:
Annals of Agricultural and Environmental Medicine; 2012, 19, 1
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Piezoelectric Effect in Strained CdTe-Based Heterostructures
Autorzy:
Cibert, J.
Andre, R.
Le Si, Dang
Powiązania:
https://bibliotekanauki.pl/articles/1933682.pdf
Data publikacji:
1995-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.66.Ηf
78.20.Ηp
77.65.Bn
Opis:
Strained III-V or II-VI heterostructures grown along a polar axis incorporate a piezoelectric field which strongly alters their electronic properties. We review some experimental studies of this built-in field, and its consequences, in CdTe-CdMnTe and CdTe-CdZnTe heterostructures. This includes: (i) the measure of the built-in field, with as an example the dependence of the piezoelectric coefficient on bond length; (ii) the description of the exciton formed by an electron and a hole which can be continuously separated in space by the piezoelectric field; (iii) some examples of the extreme sensitivity to any additional electric field.
Źródło:
Acta Physica Polonica A; 1995, 88, 4; 591-600
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamics of Polariton Emission in the Linear Regime
Autorzy:
Kłopotowski, Ł.
Santos, R.
Amo, A.
Martín, M. D.
Viña, L.
André, R.
Powiązania:
https://bibliotekanauki.pl/articles/2038373.pdf
Data publikacji:
2004-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.36.+c
71.55.Gs
78.47.+p
Opis:
We studied the dependence of polariton emission dynamics on polariton wave-vector and exciton-photon energy detuning. To reproduce the experimental data, we applied a model that obtains the photonic and the excitonic emission rates of the polariton.
Źródło:
Acta Physica Polonica A; 2004, 106, 3; 443-450
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cavity-Polariton Effects in II-VI Microcavities
Autorzy:
André, R.
Boeuf, F.
Heger, D.
Dang, Le Si
Romestain, R.
Bleuse, J.
Müller, M.
Powiązania:
https://bibliotekanauki.pl/articles/2011103.pdf
Data publikacji:
1999-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.36.+c
42.55.Sa
78.66.-w
Opis:
Semiconductor microcavities are monolithic multilayer heterostructures grown by molecular beam epitaxy. They allow the confinement along the growth axis of both photons between the Bragg reflectors and excitons in quantum wells. If the exciton-photon coupling matrix element is large enough compared to the line width, the system is said to be in the strong coupling regime. In that case a quantum well exciton couples to another discrete state: the photon mode of a planar microcavity with the same in-plane wave vector, to give rise to quasi-stationary states named cavity polaritons. In this regime, the Fermi golden rule does not hold any more and the optical properties, linear or nonlinear, are strongly related to polariton features. A review of the optical properties of CdTe-based microcavities operating in the strong coupling regime is given in this paper. The strength of the exciton-photon coupling, dynamic optical properties, and relaxation processes along polariton dispersion curves will be discussed, as well as stimulated emission of cavity polariton luminescence.
Źródło:
Acta Physica Polonica A; 1999, 96, 5; 511-524
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 19

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