Coherent photocurrent spectroscopy of single InP-based quantum dots in the telecom band at 1.5 µm

Abstract

In this work we study the resonant and coherent properties of single InP-based InAs quantum dots, which show an optical emission in the telecom C-band and L-band. High-resolution resonant photocurrent spectroscopy on p–i–n devices reveals narrow linewidths and fully resolved fine structure splittings. We observe Lorentzian line shapes, which allow for the extraction of dephasing times as a function of the applied bias voltage. Coherent ps laser excitation results in pronounced Rabi rotations with increasing pulse area. For π-pulse excitation, we obtain more than 93 % of the theoretically expected photocurrent amplitude. Our results also demonstrate that such state-of-the-art InP-based quantum dots for the telecom band exhibit promising key parameters comparable to well-established InAs/GaAs counterparts.

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Acknowledgments

We would like to acknowledge financial support from the German Federal Ministry of Education and Research (BMBF) via the Q.com projects 16KIS0112 and 16KIS0114.

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Correspondence to S. Gordon.

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This paper is part of the topical collection “Quantum Repeaters: From Components to Strategies” guest edited by Manfred Bayer, Christoph Becher and Peter van Loock.

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Gordon, S., Yacob, M., Reithmaier, J.P. et al. Coherent photocurrent spectroscopy of single InP-based quantum dots in the telecom band at 1.5 µm. Appl. Phys. B 122, 37 (2016). https://doi.org/10.1007/s00340-015-6279-6

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Keywords

  • Bias Voltage
  • Optical Parametric Oscillator
  • Molecular Beam Epitaxy Growth
  • Internal Electric Field
  • Dephasing Time