Authors
Ruiqi Liu, Suo Wang, Zeqiu Liu, Shiyu Mei, Jiahui Chi, Haiyang Yu, Yulian Cao, Jianguo Liu
Published in
Nanophotonics (Berlin, Germany). Volume 15. Issue 15. Pages e70211. Epub Jul 28, 2026.
Abstract
Heterogeneous integration of III-V lasers on silicon is pivotal for scaling next-generation photonic systems, yet it faces a fundamental bottleneck: the inherent trade-off between coupler compactness and misalignment tolerance. In this work, we break this longstanding barrier by combining multi-start adjoint optimization with a physics-guided strategy that places dense control points in near-phase-matched regions. This approach produces a more extended phase-near-matched region that spatially overlaps with the region of controlled odd supermode excitation, which is the key condition for simultaneously achieving compactness and tolerance. Our design achieves 98.11% coupling efficiency within a footprint of just 20 μm. Remarkably, it sustains over 80% efficiency under substantial misalignments up to ± 1.1 μm and waveguide width variations of ± 0.4 μm-representing the highest tolerance per unit length reported for vertical III-V-on-silicon couplers. This achievement decouples the traditional conflict between size and robustness, offering a critical solution for high-yield micro-transfer printing and dense photonic integration. The successful extension of our optimization framework to the lithium niobate-on-silicon nitride platform confirms its generality, positioning it as a versatile and transformative design strategy for a broad range of heterogeneous photonic platforms.
PMID:
42845982
Bibliographic data and abstract were imported from PubMed on 08 Oct 2026.
Read full publication at:
Please sign in
to see all details.
Advertisement
Stats
- Recommendations n/a n/a positive of 0 vote(s)
- Views 7
- Comments 0