Strain-compensated quantum dots emitting at 1.5 micron: resonant nonlinear optical properties and exciton dynamics

Junko Ishi-Hayase; Kouichi Akahane; Naokatsu Yamamoto; Mamiko Kujiraoka; Kazuhiro Ema; Masahide Sasaki

doi:10.1117/12.732348

10 September 2007 Strain-compensated quantum dots emitting at 1.5 micron: resonant nonlinear optical properties and exciton dynamics

Junko Ishi-Hayase, Kouichi Akahane, Naokatsu Yamamoto, Mamiko Kujiraoka, Kazuhiro Ema, Masahide Sasaki

Author Affiliations +

Proceedings Volume 6779, Nanophotonics for Communication: Materials, Devices, and Systems IV; 677903 (2007) https://doi.org/10.1117/12.732348
Event: Optics East, 2007, Boston, MA, United States

Abstract

The population and coherent dynamics of excitons in InAs quantum dots were investigated using transient pump-probe and four-wave mixing spectroscopies in the telecommunications wavelength range. The sample was fabricated on an InP(311)B substrate using strain compensation to control the emission wavelength. This technique also enabled us to stack over a hundred QD layers, which resulted in a significant enhancement of nonlinear signals. By controlling the polarization directions of incident pulses, we precisely estimated the radiative and non-radiative lifetimes, the transition dipole moment, and the dephasing time while taking into account their anisotropic properties. The measured radiative lifetime and dephasing time shows large anisotropies with respect to the crystal axes, which results from the anisotropic nature of the transition dipole moment. The anisotropy is larger than that for InAs quantum dots on a GaAs(100) substrate, which seems to reflect a lack of symmetry on an (311)B substrate. A quantitative comparison of these anisotropies demonstrates that nonradiative population relaxation and pure dephasing are quite small in our QDs.

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Junko Ishi-Hayase, Kouichi Akahane, Naokatsu Yamamoto, Mamiko Kujiraoka, Kazuhiro Ema, and Masahide Sasaki "Strain-compensated quantum dots emitting at 1.5 micron: resonant nonlinear optical properties and exciton dynamics", Proc. SPIE 6779, Nanophotonics for Communication: Materials, Devices, and Systems IV, 677903 (10 September 2007); https://doi.org/10.1117/12.732348

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