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Wyświetlanie 1-15 z 18
Tytuł:
Quantum Dots as Sources and Detectors οf Mid- and Far-Infrared Radiation: Theoretical Models
Autorzy:
Vukmirović, N.
Indjin, D.
Ikonić, Z.
Harrison, P.
Powiązania:
https://bibliotekanauki.pl/articles/1791186.pdf
Data publikacji:
2009-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.21.La
78.67.Hc
73.63.Kv
85.60.Gz
85.35.Be
Opis:
We present a review of theoretical methods used to study the electronic structure, optical and transport properties of intraband optoelectronic devices based on self-assembled quantum dots.
Źródło:
Acta Physica Polonica A; 2009, 116, 4; 464-467
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Intervalley Scattering and the Role of Indirect Band Gap AlAs Barriers: Application to GaAs/AlGaAs Quantum Cascade Lasers
Autorzy:
Mc Tavish, J.
Ikonić, Z.
Indjin, D.
Harrison, P.
Powiązania:
https://bibliotekanauki.pl/articles/1813212.pdf
Data publikacji:
2008-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.10.-d
73.21.Fg
73.63.Hs
Opis:
We report on the results of our simulations of Γ-X scattering in GaAs/AlGaAs heterostructures, discussing the importance of the mole fraction, doping density, and lattice and electron temperature in determining the scattering rates. We consider three systems, a single quantum well (for the investigation of Γ-X scattering), a double quantum well (to compare the Γ-X-G and Γ-Γ scattering rates), and an example of a GaAs/AlGaAs mid-infrared quantum cascade laser. Our simulations suggest that Γ-X scattering can be significant at room temperature but falls off rapidly at lower temperatures. One important factor determining the scattering rate is found to be the energy difference between the Γ- and X-states.
Źródło:
Acta Physica Polonica A; 2008, 113, 3; 891-902
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Charge Carrier Transport in Quantum Cascade Lasers in Strong Magnetic Field
Autorzy:
Radovanović, J.
Milanović, V.
Indjin, D.
Ikonić, Z.
Harrison, P.
Powiązania:
https://bibliotekanauki.pl/articles/1505456.pdf
Data publikacji:
2011-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.10.-d
73.21.Fg
Opis:
We have developed a comprehensive rate equations based model for calculating the optical gain in the active region of a quantum cascade laser in magnetic field perpendicular to the structure layers, which takes into account all the relevant scattering channels. The model is applied to gain-optimized quantum cascade laser active region, obtained by a systematic optimization procedure based on the use of genetic algorithm, which we have previously set up for designing novel structures and improving performance of existing ones. It has proven to be very efficient in generating optimal structures which emit radiation at specified wavelengths corresponding to absorption fingerprints of particular harmful pollutants found in the atmosphere. We also illustrate another interesting prospective application of quantum cascade laser-type structures: the design of metamaterials with tunable complex permittivity, based on amplification via intersubband transitions. In this case, the role of the magnetic field is to assist the attainment of sufficient optical gain (population inversion), necessary to effectively manipulate the permittivity and fulfill the conditions for negative refraction (left-handedness).
Źródło:
Acta Physica Polonica A; 2011, 119, 2; 99-102
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spin Precession of Quasi-Bound States in Heterostructures with Spin-Orbit Interaction
Autorzy:
Isić, G.
Indjin, D.
Ikonić, Z.
Milanović, V.
Radovanović, J.
Harrison, P.
Powiązania:
https://bibliotekanauki.pl/articles/1791209.pdf
Data publikacji:
2009-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.70.Ej
73.20.At
73.21.Fg
Opis:
We use a finite-difference model that is capable of describing the single state spin dynamics in a double-barrier AlGaAs heterostructure. The use of Green's functions enables a description of the double-barrier structure by a finite matrix while the interaction with contacts is described by appropriate self-energies. To account for interface roughness scattering, a self-energy $Σp_{IR}$(E, k) is derived within the random phase approximation. The dominant part is due to in-plane momentum relaxation while a smaller part describing spin-flip scattering is neglected. The former only decreases the state lifetime while the latter can also affect the spin precession frequency.
Źródło:
Acta Physica Polonica A; 2009, 116, 4; 513-515
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of aggregate size on the water content estimated with time domain reflectance [TDR]
Autorzy:
Whalley, W.R.
Leeds-Harrison, P.B.
Whitmore, A.P.
Sarker, P.K.
Powiązania:
https://bibliotekanauki.pl/articles/25515.pdf
Data publikacji:
2004
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
soil structure
time domain reflectance
calibration
aggregate size
water content
Źródło:
International Agrophysics; 2004, 18, 2
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quercetin: health benefits with relevance to TNF-alpha-linked inflammatory diseases
Autorzy:
Harrison, A.P.
Cooper, R.G.
Powiązania:
https://bibliotekanauki.pl/articles/3012.pdf
Data publikacji:
2008
Wydawca:
Instytut Medycyny Wsi
Tematy:
quercetin
health benefit
tumour necrosis factor-alpha
human disease
inflammatory disease
flavonoids
fruit
human health
Źródło:
Journal of Pre-Clinical and Clinical Research; 2008, 02, 2
1898-2395
Pojawia się w:
Journal of Pre-Clinical and Clinical Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Radiative Recombination Spectra of Heavily p-Type δ-Doped GaAs/AlAs MQWs
Autorzy:
Kundrotas, J.
Čerškus, A.
Valušis, G.
Lachab, M.
Khanna, S.
Harrison, P.
Linfield, E.
Powiązania:
https://bibliotekanauki.pl/articles/1813382.pdf
Data publikacji:
2008-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.-m
78.67.De
71.30.+h
Opis:
We present a study of the photoluminescence properties of heavily Be δ-doped GaAs/AlAs multiple quantum wells measured at room and liquid nitrogen temperatures. Possible mechanisms for photocarriers recombination are discussed, with a particular focus on the peculiarities of the excitonic and free carriers-acceptors photoluminescence emissions occurring below and above the Mott metal-insulator transition. Moreover, based on a simple theoretical model, it is found that the critical impurities concentration to observe the Mott transition in the multiple quantum wells samples exhibiting 15 nm wells width and 5 nm thick barrier layers is ≈3×$10^{12} cm^{-2}$.
Źródło:
Acta Physica Polonica A; 2008, 113, 3; 963-966
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental Study of Optical Transitions in Be-Doped GaAs/AlAs Multiple Quantum Wells
Autorzy:
Kundrotas, J.
Čerškus, A.
Ašmontas, S.
Valušis, G.
Sherliker, B.
Halsall, M.
Harrison, P.
Steer, M.
Powiązania:
https://bibliotekanauki.pl/articles/1178273.pdf
Data publikacji:
2005-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.35.-y
78.55.-m
Opis:
We present a photoluminescence study of optical transitions in Be acceptor-doped GaAs/AlAs multiple quantum wells at room and liquid nitrogen temperatures. We investigate excitonic spectra and reveal acceptor-impurity induced effects in multiple quantum wells having different width.
Źródło:
Acta Physica Polonica A; 2005, 107, 2; 245-249
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Benefits of alpha-ketoglutarate versus succinate on rat muscle dysfunction as a result of exposure to a uremic environment
Autorzy:
Bartels, E.M.
Pierzynowski, S.G.
Harrison, A.P.
Powiązania:
https://bibliotekanauki.pl/articles/3496.pdf
Data publikacji:
2007
Wydawca:
Instytut Medycyny Wsi
Źródło:
Journal of Pre-Clinical and Clinical Research; 2007, 01, 1
1898-2395
Pojawia się w:
Journal of Pre-Clinical and Clinical Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dietary supplementation with phytohemagglutinin in combination with alpha-ketoglutarate limits the excretion of nitrogen via urinary tract
Autorzy:
Filip, R
Wdowiak, L.
Harrison, A.P.
Pierzynowski, S.G.
Powiązania:
https://bibliotekanauki.pl/articles/51877.pdf
Data publikacji:
2008
Wydawca:
Instytut Medycyny Wsi
Tematy:
excretion
urinary tract
nitrogen elimination
dietary supplementation
rat
gastrointestinal tract
phytohemagglutinin
alpha-ketoglutaric acid
Źródło:
Annals of Agricultural and Environmental Medicine; 2008, 15, 2
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Carrier Dynamics in Quantum Cascade Lasers
Autorzy:
Harrison, P.
Indjin, D.
Jovanović, V. D.
Mirčetić, A.
Ikonić, Z.
Kelsall, R. W.
McTavish, J.
Savić, I.
Vukmirović, N.
Milanović, V.
Powiązania:
https://bibliotekanauki.pl/articles/2041634.pdf
Data publikacji:
2005-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.60.-v
Opis:
A fully quantum-mechanical model for carrier scattering transport in semiconductor intersubband devices was applied to modelling of carrier dynamics in quantum cascade lasers. The standard model uses the envelope function and effective mass approximations to solve electron band structure under an applied bias. The k·p model has been employed in p-type systems where the more complex band structure requires it. The resulting wave functions are then used to evaluate all relevant carrier-phonon, carrier-carrier and alloy scattering rates from each quantised state to all others within the same and the neighbouring period. This piece of information is then used to construct a rate equation for the equilibrium carrier density in each subband and this set of coupled rate equations are solved self-consistently to obtain the carrier density in each eigenstate. The latter is a fundamental description of the device and can be used to calculate the current density and gain as a function of the applied bias and temperature, which in turn yields the threshold current and expected temperature dependence of the device characteristics. A recent extension which includes a further iteration of an energy balance equation also yields the electron (or hole) temperature over the subbands. This paper will review the method and describe its application to mid-infrared and terahertz, GaAs, GaN, and SiGe cascade laser designs.
Źródło:
Acta Physica Polonica A; 2005, 107, 1; 75-81
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical and Terahertz Characterization of Be-Doped GaAs/AlAs Multiple Quantum Wells
Autorzy:
Čechavičius, B.
Kavaliauskas, J.
Krivaitė, G.
Seliuta, D.
Širmulis, E.
Devenson, J.
Valušis, G.
Sherliker, B.
Halsall, M.
Steer, M.
Harrison, P.
Powiązania:
https://bibliotekanauki.pl/articles/2041764.pdf
Data publikacji:
2005-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.66.-w
85.30.De
Opis:
We report on optical, photoreflectance and surface photovoltage, as well as terahertz photocurrent investigation of Be-doped GaAs/AlAs multiple quantum wells at room and liquid helium temperatures, respectively. From the Franz-Keldysh oscillations observed in photoreflectance spectra we determine built-in electric fields within the structure. Interband transition energies calculated by the transfer matrix method are in qualitative agreement with experimentally determined values for the samples having various, from 2×10$\text{}^{10}$ up to 2.5×10$\text{}^{12}$ cm$\text{}^{-2}$, Be doping densities. The photocurrent observed in the range of 5.4-7.3 THz we associate with photoionization of Be-acceptor states.
Źródło:
Acta Physica Polonica A; 2005, 107, 2; 328-332
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Healthy ageing: the beneficial effect of dietary supplementation with alpha-ketoglutarate on arterial elasticity in elderly mice
Autorzy:
Harrison, A.P.
Bruggemann, D.
Bartels, E.M.
Andrea, K.
Pierzynowski, S.
Powiązania:
https://bibliotekanauki.pl/articles/3567.pdf
Data publikacji:
2009
Wydawca:
Instytut Medycyny Wsi
Źródło:
Journal of Pre-Clinical and Clinical Research; 2009, 03, 1
1898-2395
Pojawia się w:
Journal of Pre-Clinical and Clinical Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 18

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