IEEE backs micro-transfer printing
Researchers say micro-transfer printing could enable scalable heterogeneous integration of diverse materials on silicon photonics platforms, paving the way for more advanced photonic integrated circuits.
A new study published in the Journal of Lightwave Technology highlights micro-transfer printing (MTP) as a promising approach for enabling heterogeneous integration in silicon photonics, offering a pathway to more advanced photonic integrated circuits (PICs) for artificial intelligence, communications and sensing applications.
The research, led by scientists at Ghent University–imec, examines how MTP can overcome one of silicon photonics' longstanding challenges: integrating diverse material systems onto CMOS-compatible photonic platforms.
While silicon photonics benefits from mature semiconductor manufacturing processes, conventional silicon materials cannot deliver all the optical functions required for advanced photonic systems, particularly efficient on-chip light sources.
According to the study, MTP enables thin-film devices, or "coupons," fabricated from materials such as indium phosphide (InP), gallium arsenide (GaAs) and lithium niobate (LiNbO₃) to be transferred onto silicon photonic wafers.
This allows each material system to be optimized independently before being integrated into a single photonic platform.
"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," said Ir. Ye Chen of Ghent University–imec.
The paper highlights several recent demonstrations of the technology, including integrated silicon photonic engines combining optical and microwave signal processing, InP lasers integrated with silicon nitride waveguides, lithium niobate modulators on silicon photonic circuits, and heterogeneous electronic-photonic receiver platforms.
The authors also discuss ongoing efforts to develop a pilot manufacturing line for large-volume industrial production while identifying remaining challenges related to yield, reliability, throughput and ecosystem development.
The researchers conclude that continued advances in micro-transfer printing could accelerate the commercialization of next-generation silicon photonics by enabling scalable heterogeneous integration using existing semiconductor manufacturing infrastructure.
