Hybrid Integration of Quantum Cascade Lasers with Germanium-on-Silicon waveguides for Mid-Infrared Sensing Applications
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arXiv
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| Main Authors: | , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866916849961140224 |
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| author | Mitchell, Colin J. Zhou, Longqi Li, Ke Adeyemi, Daniel Osman, Ahmed Nedeljkovic, Milos Churchill, Glenn Gates, James C. Reed, Graham T. Groom, Kristian M. Heffernan, Jon Mashanovich, Goran |
| author_facet | Mitchell, Colin J. Zhou, Longqi Li, Ke Adeyemi, Daniel Osman, Ahmed Nedeljkovic, Milos Churchill, Glenn Gates, James C. Reed, Graham T. Groom, Kristian M. Heffernan, Jon Mashanovich, Goran |
| contents | We present a novel scheme for hybrid integration of quantum cascade laser bars with germanium-on-silicon waveguides operating in the mid-infrared. The laser bars are flip-chip bonded onto a germanium-on-silicon target chip without active alignment, acheiving end-fire coupling efficiency of up to 45% (3.5 dB loss) in pulsed operation. Optical power estimates indicate 20-30 mW coupled into the waveguides. The passive alignment approach, combined with a CMOS-compatible photonic integrated circuit fabrication process, offers a scalable pathway to fully integrated mid-infrared photonic systems for sensing, free-space communications, and the realisation of novel light sources. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_14003 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Hybrid Integration of Quantum Cascade Lasers with Germanium-on-Silicon waveguides for Mid-Infrared Sensing Applications Mitchell, Colin J. Zhou, Longqi Li, Ke Adeyemi, Daniel Osman, Ahmed Nedeljkovic, Milos Churchill, Glenn Gates, James C. Reed, Graham T. Groom, Kristian M. Heffernan, Jon Mashanovich, Goran Optics Signal Processing Applied Physics We present a novel scheme for hybrid integration of quantum cascade laser bars with germanium-on-silicon waveguides operating in the mid-infrared. The laser bars are flip-chip bonded onto a germanium-on-silicon target chip without active alignment, acheiving end-fire coupling efficiency of up to 45% (3.5 dB loss) in pulsed operation. Optical power estimates indicate 20-30 mW coupled into the waveguides. The passive alignment approach, combined with a CMOS-compatible photonic integrated circuit fabrication process, offers a scalable pathway to fully integrated mid-infrared photonic systems for sensing, free-space communications, and the realisation of novel light sources. |
| title | Hybrid Integration of Quantum Cascade Lasers with Germanium-on-Silicon waveguides for Mid-Infrared Sensing Applications |
| topic | Optics Signal Processing Applied Physics |
| url | https://arxiv.org/abs/2507.14003 |