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Room-temperature low-threshold current-injection InGaAs quantum-dot microdisk lasers with single-mode emission.

Ming-Hua Mao1, Hao-Che Chien, Jay-Zway Hong

  • 1Department of Electrical Engineering, No 1, Roosevelt Rd Sec 4, Taipei 10617, Taiwan. mhmao@cc.ee.ntu.edu.tw

Optics Express
|September 22, 2011
PubMed
Summary

We developed InGaAs quantum-dot microdisk lasers with improved carrier injection. These lasers demonstrate low threshold current and enhanced thermal stability, outperforming edge-emitting devices.

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Area of Science:

  • Optoelectronics
  • Semiconductor Lasers
  • Quantum Dot Technology

Background:

  • Quantum dot (InGaAs) lasers offer unique optical properties.
  • Microdisk cavities provide high optical confinement.
  • Efficient carrier injection is crucial for low-threshold laser operation.

Purpose of the Study:

  • To fabricate and characterize current-injection InGaAs quantum-dot microdisk lasers.
  • To investigate the effect of microdisk design on carrier injection and modal control.
  • To analyze the thermal characteristics (characteristic temperature T0) of these devices.

Main Methods:

  • Fabrication of InGaAs quantum-dot microdisk lasers with benzocyclobutene cladding.
  • Design optimization of the microdisk pedestal diameter for carrier injection.

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  • Measurement of threshold current and characteristic temperature (T0) at various temperatures.

    • Main Results:

    • Achieved a low threshold current of 0.45 mA at room temperature for a 6.5 μm diameter device.
    • Observed single-mode emission from quantum-dot ground states.
    • Demonstrated a negative characteristic temperature (T0) between 80 K and 150 K, with a transition to positive T0 at 150 K.
    • Exhibited significantly higher positive T0 compared to edge-emitting lasers from the same wafer, indicating lower cavity losses.

    Conclusions:

    • The designed microdisk structure facilitates efficient carrier injection and modal control.
    • The observed thermal characteristics suggest reduced optical losses in the microdisk cavities.
    • These quantum-dot microdisk lasers show promising performance for optoelectronic applications.