What does this research mean for the field?

Passive alignment via flip-chip bonding enables the hybrid integration of quantum cascade lasers with germanium-on-silicon waveguides, achieving up to 45% end-fire coupling efficiency in the mid-infrared. Novelty: ClaimNovelty.METHODOLOGICAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To develop and evaluate a scalable, CMOS-compatible hybrid integration platform coupling mid-infrared quantum cascade lasers with germanium-on-silicon waveguides without active alignment.

August 23, 2026Optics ExpressOpen Access

Hybrid Integration of Quantum Cascade Lasers with Germanium-on-Silicon waveguides for Mid-Infrared Sensing Applications

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Authors

CMC. J. MitchellQueen's University Belfast LZLongqi ZhouDongbei University of Finance and Economics KLKe LiJilin University

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Implication

Experimental investigation demonstrates passive hybrid integration of quantum cascade lasers with germanium-on-silicon waveguides, indicating a scalable route for mid-infrared photonic sensing.

Key Points

To develop and evaluate a scalable, CMOS-compatible hybrid integration platform coupling mid-infrared quantum cascade lasers with germanium-on-silicon waveguides without active alignment.
Flip-chip bonded quantum cascade laser bars onto a germanium-on-silicon photonic chip using passive alignment techniques.
Implemented an end-fire optical coupling scheme fabricated with standard CMOS-compatible processing and evaluated performance in pulsed operation mode.
Achieved an end-fire optical coupling efficiency of up to 45% (corresponding to an insertion loss of 3.5 dB).
Coupled an estimated 20 to 30 mW of optical power directly into the germanium-on-silicon waveguides.

Cite This Study

Mitchell et al. (2026) studied this question.

synapsesocial.com/papers/6a8aad167677a341144454bf https://doi.org/10.1364/oe.600656

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Implication

Experimental investigation demonstrates passive hybrid integration of quantum cascade lasers with germanium-on-silicon waveguides, indicating a scalable route for mid-infrared photonic sensing.

Hybrid Integration of Quantum Cascade Lasers with Germanium-on-Silicon waveguides for Mid-Infrared Sensing Applications

Discussion

Member takes

Implication

Key Points

Cite This Study

Hybrid Integration of Quantum Cascade Lasers with Germanium-on-Silicon waveguides for Mid-Infrared Sensing Applications

Discussion

Member takes

Implication

Key Points

Cite This Study

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