3 years ago

# Telecom wavelength single quantum dots with very small excitonic fine-structure splitting.

Andrei Kors, Mohamed Benyoucef, Johann Peter Reithmaier

We report on molecular beam epitaxy growth of symmetric InAs/InP quantum dots (QDs) emitting at telecom C-band (1.55 $\mu$m) with ultra-small excitonic fine-structure splitting of ~2 $\mu$eV. The QDs are grown on distributed Bragg reflector and systematically characterized by micro-photoluminescence ($\mu$-PL) measurements. One order of magnitude of QD PL intensity enhancement is observed in comparison with as-grown samples. Combination of power-dependent and polarization-resolved measurements reveal background-free exciton, biexciton and dark exciton emission with resolution-limited linewidth below 35 $\mu$eV and biexciton binding energy of ~1 meV. The results are confirmed by statistical measurements of about 20 QDs.

Publisher URL: http://arxiv.org/abs/1801.06985

DOI: arXiv:1801.06985v1

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