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Electrically pumped blue laser diodes with nanoporous bottom cladding.

Marta Sawicka, Grzegorz Muziol, Natalia Fiuczek

|April 27, 2022

Summary

We developed new laser diodes (LDs) using nanoporous cladding for improved light confinement. This method enhances III-nitride laser fabrication, potentially reducing light leakage and improving performance.

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Area of Science:

Materials Science
Optoelectronics
Semiconductor Physics

Background:

III-nitride laser diodes (LDs) are crucial optoelectronic devices.
Improving light confinement and reducing substrate leakage are key challenges in LD design.

Purpose of the Study:

To demonstrate electrically pumped III-nitride edge-emitting laser diodes (LDs) utilizing a nanoporous bottom cladding.
To investigate the impact of nanoporous cladding on laser performance and optical mode confinement.

Main Methods:

Fabrication of LDs with nanoporous GaN:Si bottom cladding using plasma-assisted molecular beam epitaxy and electrochemical etching.
Characterization of laser performance including wavelength and slope efficiency.
Theoretical modeling of optical mode confinement and light leakage for varying porosity and thickness.

Main Results:

Successfully fabricated and operated LDs with nanoporous bottom cladding at 448.7 nm with a slope efficiency (SE) of 0.2 W/A.
Reference devices without nanoporous cladding lased at 457 nm with an SE of 0.56 W/A.
Theoretical modeling guided the selection of optimal porosity and thickness for enhanced optical confinement and reduced leakage.

Conclusions:

Nanoporous bottom cladding is a viable technique for improving optical mode confinement in III-nitride LDs.
This approach offers new possibilities for advanced III-nitride laser fabrication.
Further optimization could lead to enhanced laser performance and reduced light leakage.