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Picosecond acoustics in semiconductor optoelectronic nanostructures.

A V Akimov1, A V Scherbakov2, D R Yakovlev3

  • 1School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, UK; Ioffe Physical-Technical Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia.

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|March 22, 2014
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Summary

Picosecond acoustic techniques reveal new quantum phenomena in semiconductor devices. High-amplitude strain pulses modify optical resonances, leading to THz sideband generation and exciton dynamics.

Keywords:
LasingOptoelectronic devicesPicosecond acousticsSemiconductors

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Area of Science:

  • Optoelectronics
  • Quantum Optics
  • Semiconductor Physics

Background:

  • Semiconductor devices with quantum wells/dots in optical microcavities are crucial for optoelectronic applications.
  • Understanding light-matter interactions in these systems at ultrafast timescales is key to device advancement.

Purpose of the Study:

  • To investigate the effects of high-amplitude picosecond strain pulses on optical microcavity semiconductor devices.
  • To explore nonadiabatic interactions between acoustic strain and quantum confined electronic states.

Main Methods:

  • Application of the picosecond acoustic technique to semiconductor devices.
  • Injection of high-amplitude picosecond strain pulses into optical microcavities.
  • Monitoring changes in optical resonance response.

Main Results:

  • Observed generation of Terahertz (THz) sidebands in optical reflectivity near polariton resonance in quantum well devices.
  • Detected destruction and recurrence of excitons by acoustic shock waves on picosecond timescales.
  • Observed a giant increase in laser output from a vertical cavity surface emitting laser with a quantum dot layer upon strain pulse injection.

Conclusions:

  • The observed phenomena are governed by nonadiabatic processes in the interaction between strain pulses and electronic quantum confined states.
  • The ability to generate short, high-amplitude strain pulses enabled the observation of these ultrafast effects.
  • These findings open new avenues for controlling and manipulating quantum states in semiconductor devices using acoustic waves.