InP-based photonic integrated circuit platform on SiC wafer

Area of Science:

• Materials Science
• Photonics
• Semiconductor Engineering

Background:

• Photonic integrated circuits (PICs) require advanced substrate materials for improved performance and thermal management.
• Indium Phosphide (InP) is a key material for active photonic devices, but its integration with other substrates presents challenges.
• Silicon Carbide (SiC) offers excellent thermal conductivity and mechanical stability, making it a potential substrate for PICs.

Purpose of the Study:

• To numerically investigate the properties of an InP-on-SiC wafer as a novel platform for photonic integrated circuits (PICs).
• To evaluate the suitability of SiC as a substrate, cladding, and heat sink for InP-based PICs.
• To assess the thermal and mechanical advantages of the InP-on-SiC platform compared to traditional InP-on-silicon dioxide/silicon (InP-on-SiO2/Si) wafers.

Main Methods:

• Numerical investigation of the InP-on-SiC wafer properties.
• Analysis of waveguide characteristics, including minimum bend radius, for InP-based strip and rib waveguides on SiC.
• Evaluation of heat dissipation capabilities due to the high-thermal-conductivity SiC substrate.
• Assessment of thermal stress in the InP-on-SiC structure compared to InP-on-SiO2/Si.

Main Results:

• SiC serves effectively as waveguide cladding, heat sink, and support substrate for InP-based PICs.
• The low refractive index of SiC enables the fabrication of PICs with small bend radii (approx. 7 μm).
• High thermal conductivity of SiC significantly enhances heat dissipation from active devices like laser diodes.
• The InP-on-SiC wafer exhibits substantially lower thermal stress than InP-on-SiO2/Si, preventing device degradation during high-temperature processes.

Conclusions:

• The InP-on-SiC wafer presents an ideal platform for developing high-performance PICs.
• This integration leverages the optoelectronic properties of InP with the thermal and mechanical benefits of SiC.
• The platform is well-suited for active photonic devices requiring efficient thermal management and high-temperature process compatibility.