Occupation behaviour of the lower exciton-polariton branch in ZnO-based microresonators

2011 ◽  
Author(s):  
C. Sturm ◽  
H. Hilmer ◽  
R. Schmidt-Grund ◽  
M. Grundmann ◽  
Jisoon Ihm ◽  
...  
Keyword(s):  
Polariton Branch

Polarization behavior of the exciton-polariton emission of ZnO-based microresonators

2009 ◽  
Vol 1208 ◽  
Author(s):  
Chris Sturm ◽  
Helena Hilmer ◽  
Rüdiger Schmidt-Grund ◽  
Marius Grundmann
Keyword(s):  
Emission Angle ◽  
Energy Splitting ◽  
Photoluminescence Intensity ◽  
Hot Carriers ◽  
Bottleneck Effect ◽  
Emission Energy ◽  
Polarization Behavior ◽  
Trace Back ◽  
Photolumi Nescence ◽  
Polariton Branch

AbstractWe present the polarization behavior of the exciton-polariton luminescence of a ZnO-based all-oxide resonator. A splitting in the emission energy between the s- and p-polarized pho-toluminescence of the lower polariton branch was observed which increases with increasing emission angle. It is caused by the polarization behavior of the uncoupled cavity-photon mode, and reaches a maximum of about 5 meV at an emission angle near the bottleneck region. For lar-ger angles the energy splitting decreases. Additionally to the energy splitting, we observed dif-ferences in the photoluminescence intensity which we trace back to different occupation of the lower polariton branch for the two polarizations. Whereas for p-polarization a bottleneck effect is clearly observable, this effect is much weaker for s-polarization. These findings indicate that the relaxation of hot carriers into the bottleneck region is enhanced for the p-polarized photolumi-nescence compared to the s-polarized one. The differences between these two polarizations are most pronounced for a very large negative detuning and vanish with increasing detuning.

scholarly journals Динамика спинорной экситон-поляритонной системы в латерально сжатых GaAs микрорезонаторах при резонансном фотовозбуждении

2018 ◽  
Vol 60 (8) ◽  
pp. 1567
Author(s):  
А.А. Деменев ◽  
Н.А. Гиппиус ◽  
В.Д. Кулаковский
Keyword(s):  
Laser Pulse ◽  
Spatial Coherence ◽  
Picosecond Laser ◽  
Threshold Value ◽  
Laser Pulses ◽  
Josephson Effects ◽  
High Q ◽  
Wide Range ◽  
Linearly Polarized ◽  
Polariton Branch

AbstractThe evolution of the spatial coherence and the polarization has been studied in a freely decaying polariton condensate that is resonantly excited by linearly polarized picosecond laser pulses at the lower and upper sublevels of the lower polariton branch in a high-Q GaAs-based microcavity with a reduced lateral symmetry without excitation of the exciton reservoir. It is found that the condensate inherits the coherence of the exciting laser pulse at both sublevels in a wide range of excitation densities and retains it for several dozen picoseconds. The linear polarization of the photoexcited condensate is retained only in the condensate at the lower sublevel. The linearly polarized condensate excited at the upper sublevel loses its stability at the excitation densities higher a threshold value: it enters a regime of internal Josephson oscillations with strongly oscillating circular and diagonal linear degrees of polarization. The polariton–polariton interaction leads to the nonlinear Josephson effects at high condensate densities. All the effects are well described in terms of the spinor Gross–Pitaevskii equations. The cause of the polarization instability of the condensate is shown to be the spin anisotropy of the polariton–polariton interaction.

Dispersion der gekoppelten Wellen beim stimulierten Raman-Effekt in einfachen piezoelektrischen kubischen Kristallen

1979 ◽  
Vol 34 (2) ◽  
pp. 126-133
Author(s):  
L. Merten ◽  
J. Wenk
Keyword(s):  
Pump Wave ◽  
Dispersion Curves ◽  
Stokes Component ◽  
Piezoelectric Crystals ◽  
Stokes Waves ◽  
Explicit Formulae ◽  
Anti Stokes ◽  
Polariton Branch ◽  
Parametric Approximation

Abstract Even in the most simple case of cubic piezoelectric crystals with only one polariton branch the problem of coupling of polariton, Stokes and anti-Stokes waves in the parametric approximation leads to six coupled waves, each consisting of a polariton component, a Stokes component and an anti-Stokes component. The dispersion of all six coupled waves can be described by explicit formulae in very good approximation. The shift of the dispersion curves of the coupled waves against the dispersion curves of the uncoupled waves is proportional to the square of the amplitude of the pump wave

Nonlinearities in emission from the lower polariton branch of semiconductor microcavities

1999 ◽  
Vol 60 (16) ◽  
pp. R11293-R11296 ◽  
Author(s):  
A. I. Tartakovskii ◽  
V. D. Kulakovskii ◽  
D. N. Krizhanovskii ◽  
M. S. Skolnick ◽  
V. N. Astratov ◽  
...  
Keyword(s):  
Semiconductor Microcavities ◽  
Polariton Branch

Evidence of an induced polariton branch in CuCl by hyper-Raman scattering

1983 ◽  
Vol 46 (1) ◽  
pp. 51-54 ◽  
Author(s):  
J.B. Grun ◽  
B. Hönerlage ◽  
R. Levy
Keyword(s):  
Raman Scattering ◽  
Polariton Branch

Dynamics of polaritons resonantly created at the upper polariton branch

2007 ◽  
Vol 41 (5-6) ◽  
pp. 328-332 ◽  
Author(s):  
M.D. Martín ◽  
D. Ballarini ◽  
A. Amo ◽  
L. Viña ◽  
R. André
Keyword(s):  
Polariton Branch
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