Mid-infrared III-V semiconductor lasers epitaxially grown on Si substrates.

Area of Science:

• Semiconductor physics
• Materials science
• Photonics

Background:

• Mid-infrared semiconductor lasers are crucial for compact sensors.
• Silicon photonics offers a platform for integrated smart sensors.
• Antimonide lasers cover the entire mid-to-far-infrared spectrum.

Purpose of the Study:

• To review the epitaxial integration of antimonide lasers on silicon substrates.
• To highlight advancements in developing mid-infrared semiconductor lasers for silicon photonics.
• To assess the performance and potential of antimonide lasers grown on silicon.

Main Methods:

• Review of molecular-beam epitaxy (MBE) strategies for antimonide laser growth on silicon.
• Discussion of metal-organic vapor phase epitaxy (MOVPE) for template layer growth.
• Analysis of device performance metrics for lasers grown on silicon versus native substrates.
• Investigation of facet etching techniques for integrated photonic circuits.

Main Results:

• High-performance GaSb-based diode lasers, InAs/AlSb quantum cascade lasers (QCLs), and InAs/GaInSb interband cascade lasers (ICLs) were achieved via direct MBE growth on silicon.
• GaAs-on-Si or GaSb-on-Si layers serve as suitable templates for antimonide laser overgrowth.
• Facet etching is a viable method for antimonide lasers on silicon in photonic integrated circuits.
• QCLs and ICLs grown on silicon demonstrate performance comparable to those on native substrates, unlike diode lasers sensitive to defects.
• Long device lifetimes were extrapolated for ICLs.

Conclusions:

• Epitaxial integration of antimonide lasers on silicon is a promising route for advanced silicon photonics and compact sensors.
• Quantum cascade and interband cascade laser technologies are particularly well-suited for integration on silicon substrates.
• Further research into optimizing growth and device design can unlock the full potential of these integrated mid-infrared laser systems.