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Toward Better Light-Confinement in Micropillar Cavities

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Ściesiek M., Gietka K., Golnik A., Kossacki P., Jakubczyk T., Pacuski W., Kruse C., Hommel D.
Acta Physica Polonica A
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2011
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vol. 120
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issue 5
877-879
EN
We report on a two-step etching of ZnTe based micropillars. We demonstrate applicability of the technology and we analyze the optical properties of obtained structures. Microphotoluminescence spectra of individual micropillars show a typical mode pattern that confirms a successful growth of photonic structures. The reflectivity and photoluminescence spectra of a planar microcavity measured for various incident angles show that additional side distributed Bragg reflectors will be important for the further enhancement of photon confinement in micropillar cavity.
2
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MBE Growth and Characterization of a III-V Distributed Bragg Reflectors and InAs Quantum Dots

100%
Rousset J., Słupinski T., Jakubczyk T., Kobak J., Stawicki P., Gołasa K., Babinski A., Nawrocki M., Pacuski W.
Acta Physica Polonica A
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2012
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vol. 122
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issue 6
984-987
EN
We describe the realization and characterization of a distributed Bragg reflectors and InAs quantum dots grown by molecular beam epitaxy. The distributed Bragg reflectors are based on a stack of eight or twenty pairs of GaAs and AlAs layers with a stopband centered at about E_0=1.24 eV (λ_0=1000 nm). The whole structures exhibit a reflectivity coefficient above 90%. The growth rate was monitored in situ by measurement of the oscillations of the thermal emission intensity. The investigations conducted on the InAs quantum dots grown on GaAs show photoluminescence around E=1.25 eV (λ=990 nm). The combination of these two elements results in the realization of a microcavity containing InAs quantum dots and surrounded by 20 pairs of distributed Bragg reflectors.
3
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Optical Properties of CdTe QDs Formed Using Zn Induced Reorganization

100%
Kobak J., Pacuski W., Jakubczyk T., Kazimierczuk T., Golnik A., Frank K., Rosenauer A., Kruse C., Hommel D., Gaj J.
Acta Physica Polonica A
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2011
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vol. 119
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issue 5
627-629
EN
In this paper we present optical studies of CdTe quantum dots formed using Zn-induced reorganization. The pattern of quantum dot photoluminescence lines is found to be similar to typical results reported for quantum dots grown with other techniques, although the positively charged exciton line is relatively more pronounced. Also the energy spacing between biexciton and exciton lines is found to be larger than in typical results. Zn-induced reorganization results in quantum dots density higher by an order of magnitude than in Te-induced quantum dots.
4
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Optical Study of ZnTe-Based 2D and 0D Photonic Structures Containing CdTe/ZnTe Quantum Dots

100%
Jakubczyk T., Kazimierczuk T., Golnik A., Bienias P., Pacuski W., Kruse C., Hommel D., Kłopotowski Ł., Wojtowicz T., Gaj J.
Acta Physica Polonica A
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2009
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vol. 116
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issue 5
888-889
EN
We report on an optical study of ZnTe-based microcavity and micropillars. Angle-resolved reflectivity studies confirm a high quality of the investigated structure by setting the lower bound on the quality factor Q ≥ 1000, determined from normal-incidence reflection spectra. In a microphotoluminescence study, micropillar modes are observed at temperatures of the order of tens of kelvins. For structures grown by a complex growth procedure at two different MBE facilities, an enhancement of photoluminescence in the cavity mode is observed.
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