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Wyświetlanie 1-15 z 19
Tytuł:
Transmission Spectra of Thue-Morse Multilayers Containing Negative Index Metamaterials
Autorzy:
Maksimovic, M.
Jaksic, Z.
Powiązania:
https://bibliotekanauki.pl/articles/2047879.pdf
Data publikacji:
2007-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.70.Qs
71.36.+c
71.55.Jv
78.20.Ci
Opis:
We study the optical transmission spectra in one-dimensional aperiodic Thue-Morse multilayers composed from alternating layers of media with positive and negative refractive index. We examine the influence of phase compensation on the spectral transmission for both on-axis and off-axis wave propagation. The origin of the transmission resonances and their relation with the field localization are analyzed. Nondispersive and lossless, as well as realistic dispersive and weakly lossy materials are considered.
Źródło:
Acta Physica Polonica A; 2007, 112, 5; 1049-1054
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
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:
SU(2) Coherent State Path Integral Investigation of the Holstein Dimer
Autorzy:
Hakioğlu, T.
Ivanov, V. A.
Zhuravlev, M. Ye.
Powiązania:
https://bibliotekanauki.pl/articles/2013732.pdf
Data publikacji:
2000-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
03.65.Db
71.36.+c
64.60.Ak
Opis:
The SU(2) coherent state path integral is used to investigate the partition function of the Holstein dimer. This approach naturally takes into account the dynamical symmetry of the model. The ground-state energy and the number of the phonons are calculated as functions of the parameters of the Hamiltonian. The renormalizations of the phonon frequency and electron hopping for bonding and antibonding states are considered. The destruction of quasiclassical mean field solution is discussed.
Źródło:
Acta Physica Polonica A; 2000, 97, 5; 927-930
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stimulated Scattering of Microcavity Polaritons
Autorzy:
Bloch, J.
Senellart, P.
Thierry-Mieg, V.
Marzin, J. Y.
Powiązania:
https://bibliotekanauki.pl/articles/2014174.pdf
Data publikacji:
2000-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.55.Sa
71.35.Lk
71.36.+c
78.30.Fs
Opis:
We report on cw optical experiments performed in a semiconductor microcavity containing a single quantum well in the strong coupling regime. Angularly resolved photoluminescence measurements under non-resonant excitation show the collapse of a relaxation bottleneck as the excitation power is increased. As a result, the emission close to k$\text{}_{∥}$=0 presents a non-linear behavior. In a two-beam experiment we resonantly inject polaritons at k$\text{}_{∥}$=0 and show that relaxation from states with large in-plane wave vector toward k$\text{}_{∥}$=0 is stimulated by the polariton final state population.
Źródło:
Acta Physica Polonica A; 2000, 98, 3; 295-302
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Polariton Effects in Molecular Crystals Studied by Classical and Quantum-Electrodynamic Approaches
Autorzy:
Stradomska, A.
Petelenz, P.
Powiązania:
https://bibliotekanauki.pl/articles/1814012.pdf
Data publikacji:
2007-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.35.-y
71.36.+c
78.20.Ci
Opis:
A quantum-electrodynamic approach is studied as an alternative to the classical description of polaritons in molecular crystals, with the focus on future interpretation of oligothiophene spectra. As expected, the results of the two approaches coincide, but the quantum description is better suited for future generalizations, notably for detailed studies of vibronic coupling. The quantum approach is used here to probe the importance of inherent polaritonic effects. They are found to be minor, being superseded by vibronic interactions; the latter are responsible for most peculiarities observed in oligothiophene spectra.
Źródło:
Acta Physica Polonica A; 2007, 112, S; S-161-S-170
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical Trapping and Propagation of Nonresonantly Driven One-Dimensional Exciton-Polariton Condensate
Autorzy:
Opala, A.
Pieczarka, M.
Sęk, G.
Powiązania:
https://bibliotekanauki.pl/articles/1033879.pdf
Data publikacji:
2017-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
67.85.De
71.36.+c
03.75.Kk
Opis:
We study theoretically a nonresonant optical creation of a one-dimensional exciton-polariton condensate in a semiconductor microcavity. The polariton condensate is treated in the mean-field approach, taking into consideration an antitrapping potential created by the reservoir of noncondensed particles. Polariton condensates are excited by multiple lasers, with a combination of continuous wave and pulsed sources. The proposed pump-probe configuration leads to the realisation of various experimental schemes, e.g. optical trapping of a polariton condensate in real space. Moreover, it can be utilised for investigation of elementary excitations in the time domain when polariton condensates from two sources interact with each other.
Źródło:
Acta Physica Polonica A; 2017, 132, 2; 401-404
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Motional Enhancement of Exciton Magnetic Moments
Autorzy:
Litvinov, A.
Kochereshko, V.
Cox, R. T.
Besombes, L.
Mariette, H.
Boukari, H.
Loginov, D.
Davies, J. J.
Smith, L. C.
Wolverson, D.
Powiązania:
https://bibliotekanauki.pl/articles/2047370.pdf
Data publikacji:
2007-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.35.Cc
71.35.Ji
71.36.+c
78.20.Ls
Opis:
The phenomenon in which giant enhancement of exciton magnetic moments occurs due to translational motion was found for light hole excitons in ZnTe/ZnMgTe quantum well structures. Decreasing diamagnetic shifts as the number of the exciton quantized state increases were found for the first time.
Źródło:
Acta Physica Polonica A; 2007, 112, 2; 161-165
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Field Induced Redistribution of Exciton-Polariton Density on Confined Modes
Autorzy:
Piętka, B.
Szczytko, J.
Łusakowski, J.
Nardin, G.
Léger, Y.
Morier-Genoud, F.
Deveaud-Plédran, B.
Powiązania:
https://bibliotekanauki.pl/articles/1409612.pdf
Data publikacji:
2012-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.36.+c
42.55.Sa
71.35.-y
71.35.Ji
78.20.Ls
Opis:
The influence of magnetic field on confined exciton-polariton modes inside a semiconductor microcavity is discussed. The three-dimensional confinement for exciton-polaritons is achieved by the mesa structures confining the photonic part of polaritons. We observe a strong increase of the polariton emission intensity and we argue that this effect is due to the change of the oscillator strength of the excitonic component of polaritons and the change of the excitonic content in polariton state as the magnetic field increases.
Źródło:
Acta Physica Polonica A; 2012, 122, 6; 1093-1095
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Intersubband Plasmon Polaritons in Multiple Quantum Well Structures
Autorzy:
Ziętkowski, W.
Załużny, M.
Powiązania:
https://bibliotekanauki.pl/articles/2028845.pdf
Data publikacji:
2001-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.66.Fd
73.20.Mf
71.36.+c
Opis:
Radiative intersubband plasmon polaritons in multiple quantum well structures, with arbitrary number of quantum wells, are discussed theoretically. The dispersion relations are derived modeling multiple quantum well structure by uniform uniaxial effective medium and using a full set of the Maxwell equations for macroscopic (local) electromagnetic fields. Numerical calculations are performed for a "GaAs-GaAs/AlGaAs multiple quantum well-air" structure corresponding to a typical total internal reflection geometry. Manifestation of these modes in total internal reflection spectra is also considered.
Źródło:
Acta Physica Polonica A; 2001, 100, 3; 425-430
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Intersubband Antipolaritons in Quantum Cascade Laser Structures
Autorzy:
Pereira, M.
Powiązania:
https://bibliotekanauki.pl/articles/1813186.pdf
Data publikacji:
2008-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.36.+c
71.10.-w
Opis:
This paper presents an application of a dielectric approach to the strong coupling between light and intersubband transitions in a quantum cascade laser structure. The multisubband transition possibility allows for an interesting scenario of coexisting absorption and gain branches in the antipolariton dispersions.
Źródło:
Acta Physica Polonica A; 2008, 113, 3; 783-786
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
From Localised to Ballistic Excitons in GaAs Quantum Wells
Autorzy:
Pulizzi, F.
Christianen, P. C. M.
Maan, J. C.
Eshlaghi, S.
Reuter, D.
Wieck, A. D.
Powiązania:
https://bibliotekanauki.pl/articles/2028827.pdf
Data publikacji:
2001-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.35.-y
71.36.+c
Opis:
The lateral motion of excitons in GaAs quantum wells is studied by means of spatially resolved photoluminescence. We show that at low temperatures (4.2 K) the exciton motion evolves from localised excitons (zero mobility) in thin quantum wells to extremely high mobilities in wide wells. We find that for the widest quantum well investigated the observed motion cannot be explained by simple exciton diffusion and must be explained by the propagation of ballistic exciton polaritons.
Źródło:
Acta Physica Polonica A; 2001, 100, 3; 397-402
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Excitonic Polaritons in Semiconductor Micropillars
Autorzy:
Bajoni, D.
Wertz, E.
Senellart, P.
Miard, A.
Semenova, E.
Lemaître, A.
Sagnes, I.
Bouchoule, S.
Bloch, J.
Powiązania:
https://bibliotekanauki.pl/articles/1811905.pdf
Data publikacji:
2008-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.36.+c
78.45.+h
78.55.Cr
78.67.Pt
Opis:
We describe the physics of cavity polaritons in semiconductor micropillars. Cavity polaritons are exciton-photon entangled states arising from the strong coupling between excitons and the optical modes of a cavity. In micropillars, the photon three-dimensional confinement results in a discrete spectrum of 0D polariton states. Characterization of the linear properties of these micropillars will be presented. Then we will show how this system can be used to generate parametric photons and to obtain polariton lasing.
Źródło:
Acta Physica Polonica A; 2008, 114, 5; 933-943
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Exciton Binding Energy in Extremely Shallow Quantum Wells
Autorzy:
Kossut, J.
Furdyna, J. K.
Powiązania:
https://bibliotekanauki.pl/articles/1877012.pdf
Data publikacji:
1995-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.20.Dx
71.36.+c
73.61.Ga
Opis:
The usual approach to the problem of excitons in semiconductor quantum wells is to assume that both the electron or the hole are primarily localized in the potential well regions defined by the band offsets, i.e., that the quantum wells are deep. We re-examine the problem of the exciton in the presence of a very shallow square well potential due to the (small) conduction and valence band offsets in a semiconducting heterostructure. We show that the combined effects of the shallow well and the Coulomb interaction between the electron and the hole are equivalent to an effective potential acting on the center-of-mass of a three-dimensional exciton. We calculate the shape of such a potential and show it to be satisfactorily approximated by the potential of a parabolic well.
Źródło:
Acta Physica Polonica A; 1995, 87, 2; 528-532
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:
Dynamical and tuneable modulation of the Tamm plasmon/exciton-polariton hybrid states using surface acoustic waves
Autorzy:
Buller, J.
Cerda-Méndez, E.
Balderas-Navarro, R.
Santos, P.
Powiązania:
https://bibliotekanauki.pl/articles/1156776.pdf
Data publikacji:
2016-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.36.+c
42.55.Sa
85.50.-n
Opis:
In this work, we discuss theoretically the formation of the Tamm plasmon/exciton-polariton hybrid states in an (Al,Ga)As microcavity and their modulation by surface acoustic waves. The modulation of the Tamm plasmon/exciton-polariton states origins in the change of the excitonic band gap energy and the thickness change of the sample structure layers due to the induced strain fields by surface acoustic waves. The frequency f_{SAW} of the acoustic modulation of the Tamm plasmon/exciton-polariton states is limited by the thickness of the upper distributed Bragg reflector. For the Tamm plasmon/exciton-polariton states in Al_xGa_{1-x}As/GaAs structures f_{SAW} is in the range of 370 MHz while f_{SAW} in GHz range is possible for the parametric Tamm plasmon/exciton-polariton states. In both cases, the acoustic modulation is several meV for typical acoustic power levels.
Źródło:
Acta Physica Polonica A; 2016, 129, 1a; A-26-A-29
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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