Silicon photonics has emerged as a promising technology for addressing bandwidth and latency bottlenecks in conventional electrical interconnects, particularly for artificial intelligence infrastructure. However, heterogeneous integration of multiple material systems remains a challenge, as standard CMOS fabrication cannot integrate non-standard materials like III-V semiconductors and lithium niobate (LiNbO₃) needed for on-chip light generation.

A new study published in Journal of Lightwave Technology on April 30, 2026 highlights micro-transfer printing (MTP) as a versatile approach for heterogeneous integration. "Among the various approaches being pursued for enabling wafer-scale heterogeneous integration, MTP is an emerging highly versatile technique that combines benefits of die-level assembly with wafer-scale processing," explains Ir. Ye Chen from Ghent University - imec, Belgium.

The MTP process fabricates thin-film devices on a dense source wafer, uses an elastomeric stamp to pick up and print devices onto a target wafer, and secures them via adhesive or direct bonding. This enables broad material compatibility, allowing multiple material systems integration within a single architecture. Recent demonstrations include InP lasers integrated with silicon nitride waveguides, GaAs lasers for VR and quantum applications, and LiNbO₃-based modulators with Si3N4 photonic circuits.

The study also presents a pilot line for industrial manufacturing and outlines challenges including yield, reliability, throughput, and the need for a scalable manufacturing ecosystem. "The MTP technology is still in its early stages of commercial application; however, we believe that consistent advancements will soon lead to large-scale industrial manufacturing," concludes Ir. Chen.