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Ultrasmall microdisk and microring lasers based on InAs/InGaAs/GaAs quantum dots.

Mikhail V Maximov1, Natalia V Kryzhanovskaya, Alexey M Nadtochiy

  • 1St. Petersburg Academic University, St. Petersburg, 194021, Russia, maximov@beam.ioffe.ru.

Nanoscale Research Letters
|August 13, 2015
PubMed
Summary

Researchers developed ultrasmall microring and microdisk lasers using InAs/InGaAs/GaAs quantum dots. These lasers operate at room temperature with low threshold power and high-temperature stability, enabling tunable spectral positions.

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Area of Science:

  • Optoelectronics
  • Semiconductor Lasers
  • Nanophotonics

Background:

  • Ultrasmall lasers are crucial for integrated photonic circuits.
  • Quantum dots offer unique optoelectronic properties for laser applications.
  • Whispering gallery mode resonators are key for compact laser designs.

Purpose of the Study:

  • To fabricate and investigate ultrasmall microring and microdisk lasers.
  • To explore the performance of InAs/InGaAs/GaAs quantum dot active regions.
  • To demonstrate tunable spectral positions of whispering gallery modes.

Main Methods:

  • Fabrication of asymmetric air/GaAs/Al0.98Ga0.02As waveguide lasers.
  • Utilizing InAs/InGaAs/GaAs quantum dots for the active region emitting at 1.3 μm.
  • Characterization of laser performance, including threshold pump power and temperature stability.

Main Results:

  • Demonstrated ultrasmall microring lasers with diameters of 2 μm and 1.5 μm.
  • Achieved a threshold pump power as low as 1.8 μW at room temperature for a specific microring design.
  • Observed lasing up to 100°C due to the high confinement energy of quantum dots.
  • Successfully tuned spectral positions of whispering gallery modes by varying microring inner diameters.

Conclusions:

  • Ultrasmall microring and microdisk lasers based on quantum dots exhibit excellent performance characteristics.
  • The demonstrated tunability and high-temperature operation are promising for advanced photonic applications.
  • These findings contribute to the development of compact and efficient semiconductor laser sources.