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

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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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 non-radiative population relaxation and pure dephasing are quite small in our QDs.

Original languageEnglish
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
Volume6779
DOIs
Publication statusPublished - 2007
Externally publishedYes
EventNanophotonics for Communication: Materials, Devices, and Systems IV - Boston, MA, United States
Duration: 2007 Sep 102007 Sep 11

Other

OtherNanophotonics for Communication: Materials, Devices, and Systems IV
CountryUnited States
CityBoston, MA
Period07/9/1007/9/11

Fingerprint

Excitons
Semiconductor quantum dots
Anisotropy
Optical properties
quantum dots
Dipole moment
excitons
radiative lifetime
optical properties
anisotropy
dipole moments
Substrates
Wavelength
Four wave mixing
wavelengths
four-wave mixing
Telecommunication
telecommunication
Pumps
Spectroscopy

Keywords

  • Quantum dot
  • Strain compensation
  • Transient nonlinear spectroscopy

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

Hayase, J., Akahane, K., Yamamoto, N., Kujiraoka, M., Ema, K., & Sasaki, M. (2007). Strain-compensated quantum dots emitting at 1.5 micron: Resonant nonlinear optical properties and exciton dynamics. In Proceedings of SPIE - The International Society for Optical Engineering (Vol. 6779). [677903] https://doi.org/10.1117/12.732348

Strain-compensated quantum dots emitting at 1.5 micron : Resonant nonlinear optical properties and exciton dynamics. / Hayase, Junko; Akahane, Kouichi; Yamamoto, Naokatsu; Kujiraoka, Mamiko; Ema, Kazuhiro; Sasaki, Masahide.

Proceedings of SPIE - The International Society for Optical Engineering. Vol. 6779 2007. 677903.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Hayase, J, Akahane, K, Yamamoto, N, Kujiraoka, M, Ema, K & Sasaki, M 2007, Strain-compensated quantum dots emitting at 1.5 micron: Resonant nonlinear optical properties and exciton dynamics. in Proceedings of SPIE - The International Society for Optical Engineering. vol. 6779, 677903, Nanophotonics for Communication: Materials, Devices, and Systems IV, Boston, MA, United States, 07/9/10. https://doi.org/10.1117/12.732348
Hayase J, Akahane K, Yamamoto N, Kujiraoka M, Ema K, Sasaki M. Strain-compensated quantum dots emitting at 1.5 micron: Resonant nonlinear optical properties and exciton dynamics. In Proceedings of SPIE - The International Society for Optical Engineering. Vol. 6779. 2007. 677903 https://doi.org/10.1117/12.732348
Hayase, Junko ; Akahane, Kouichi ; Yamamoto, Naokatsu ; Kujiraoka, Mamiko ; Ema, Kazuhiro ; Sasaki, Masahide. / Strain-compensated quantum dots emitting at 1.5 micron : Resonant nonlinear optical properties and exciton dynamics. Proceedings of SPIE - The International Society for Optical Engineering. Vol. 6779 2007.
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