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Jack Baker
PhD MPhys
Research Associate
Condensed Matter and Photonics Group
Overview
I am a Research Associate in Optoelectronics at the School of Physics and Astronomy, Cardiff University. My research activities are part of the Future Compound Semiconductor Manufacturing Hub (CS Hub) , QUantum Dot On Silicon (QUDOS), and Strength in Places Fund (SiPf) CSconnected projects.
Under the CS Hub my work focusses on the fabrication and characterisation of III-V optoelectronic devices at scale, particularly VCSELs, LEDs, and EELs. For QUDOS, I work on the development of QD-based components for photonic integrated circuits. Under SiPf, my focus in on large-scale GaAs-based wafer manufacturing and next-generation optical communications and sensing technologies.
Publication
2025
- Baker, J., Allford, C. P., Gillgrass, S., Davies, J. I., Shutts, S. and Smowton, P. M. 2025. Thermal performance of 940 nm AlGaAs-Based VCSELs grown on germanium. IEEE Photonics Journal (10.1109/jphot.2025.3552951)
2024
- Baker, J., Allford, C. P., Gillgrass, S., Davies, J. I., Shutts, S. and Smowton, P. M. 2024. Improved thermal performance of VCSELs on germanium substrates. Presented at: IEEE 29th International Semiconductor Laser Conference (ISLC), Orlando, FL, USA, 29 September - 02 October 20242024 IEEE 29th International Semiconductor Laser Conference (ISLC). IEEE pp. 1-2., (10.1109/islc57752.2024.10717337)
- Gillgrass, S., Baker, J., Allford, C., Johnson, A., Davies, J., Shutts, S. and Smowton, P. 2024. First demonstration of 940-nm VCSELs fabricated over 200-mm GaAs- and Ge-substrates. Presented at: IEEE 29th International Semiconductor Laser Conference (ISLC), Orlando, FL, USA, 29 September - 02 October 20242024 IEEE 29th International Semiconductor Laser Conference (ISLC). IEEE, (10.1109/islc57752.2024.10717349)
- Burman, T. T. et al. 2024. Assessing plasma-etched InP laser facet quality. IEEE Photonics Technology Letters (10.1109/LPT.2024.3397082)
2023
- Baker, J. 2023. Quick VCSELs and wafer assessment for volume MOVPE production. PhD Thesis, Cardiff University.
- Hentschel, C. et al. 2023. Gain measurements on VCSEL material using segmented contact technique. Journal of Physics D: Applied Physics 56(7), pp. 74003. (10.1088/1361-6463/acaf0b)
2022
- Baker, J. et al. 2022. VCSEL quick fabrication of 894.6 nm wavelength epi‐material for miniature atomic clock applications. IET Optoelectronics (10.1049/ote2.12082)
- Baker, J. et al. 2022. VCSEL quick fabrication for assessment of large diameter epitaxial wafers. IEEE Photonics Journal 14(3) (10.1109/JPHOT.2022.3169032)
2021
- Baker, J., Gillgrass, S., Allford, C. P., Hentschel, C., Davies, J. I., Shutts, S. and Smowton, P. M. 2021. Sub-mA threshold current vertical cavity surface emitting lasers with a simple fabrication process. Presented at: 2021 IEEE Photonics Conference (IPC), 18-21 October 2021Proceedings of the 2021 IEEE Photonics Conference (IPC). IEEE, (10.1109/IPC48725.2021.9592977)
- Hentschel, C. et al. 2021. Gain measurements on vertical cavity surface emitting laser material using segmented contact technique. Presented at: 2021 IEEE Photonics Conference (IPC), 18-21 October 20212021 IEEE Photonics Conference (IPC). IEEE, (10.1109/IPC48725.2021.9592961)
- Baker, J. et al. 2021. Quick fabrication VCSELs for characterisation of epitaxial material. Applied Sciences 11(20), article number: 9369. (10.3390/app11209369)
Articles
- Baker, J., Allford, C. P., Gillgrass, S., Davies, J. I., Shutts, S. and Smowton, P. M. 2025. Thermal performance of 940 nm AlGaAs-Based VCSELs grown on germanium. IEEE Photonics Journal (10.1109/jphot.2025.3552951)
- Burman, T. T. et al. 2024. Assessing plasma-etched InP laser facet quality. IEEE Photonics Technology Letters (10.1109/LPT.2024.3397082)
- Hentschel, C. et al. 2023. Gain measurements on VCSEL material using segmented contact technique. Journal of Physics D: Applied Physics 56(7), pp. 74003. (10.1088/1361-6463/acaf0b)
- Baker, J. et al. 2022. VCSEL quick fabrication of 894.6 nm wavelength epi‐material for miniature atomic clock applications. IET Optoelectronics (10.1049/ote2.12082)
- Baker, J. et al. 2022. VCSEL quick fabrication for assessment of large diameter epitaxial wafers. IEEE Photonics Journal 14(3) (10.1109/JPHOT.2022.3169032)
- Baker, J. et al. 2021. Quick fabrication VCSELs for characterisation of epitaxial material. Applied Sciences 11(20), article number: 9369. (10.3390/app11209369)
Conferences
- Baker, J., Allford, C. P., Gillgrass, S., Davies, J. I., Shutts, S. and Smowton, P. M. 2024. Improved thermal performance of VCSELs on germanium substrates. Presented at: IEEE 29th International Semiconductor Laser Conference (ISLC), Orlando, FL, USA, 29 September - 02 October 20242024 IEEE 29th International Semiconductor Laser Conference (ISLC). IEEE pp. 1-2., (10.1109/islc57752.2024.10717337)
- Gillgrass, S., Baker, J., Allford, C., Johnson, A., Davies, J., Shutts, S. and Smowton, P. 2024. First demonstration of 940-nm VCSELs fabricated over 200-mm GaAs- and Ge-substrates. Presented at: IEEE 29th International Semiconductor Laser Conference (ISLC), Orlando, FL, USA, 29 September - 02 October 20242024 IEEE 29th International Semiconductor Laser Conference (ISLC). IEEE, (10.1109/islc57752.2024.10717349)
- Baker, J., Gillgrass, S., Allford, C. P., Hentschel, C., Davies, J. I., Shutts, S. and Smowton, P. M. 2021. Sub-mA threshold current vertical cavity surface emitting lasers with a simple fabrication process. Presented at: 2021 IEEE Photonics Conference (IPC), 18-21 October 2021Proceedings of the 2021 IEEE Photonics Conference (IPC). IEEE, (10.1109/IPC48725.2021.9592977)
- Hentschel, C. et al. 2021. Gain measurements on vertical cavity surface emitting laser material using segmented contact technique. Presented at: 2021 IEEE Photonics Conference (IPC), 18-21 October 20212021 IEEE Photonics Conference (IPC). IEEE, (10.1109/IPC48725.2021.9592961)
Thesis
- Baker, J. 2023. Quick VCSELs and wafer assessment for volume MOVPE production. PhD Thesis, Cardiff University.
Contact Details
BakerJ19@cardiff.ac.uk
Translational Research Hub, Room 2.11, Maindy Road, Cathays, Cardiff, CF24 4HQ
Translational Research Hub, Room 2.11, Maindy Road, Cathays, Cardiff, CF24 4HQ
Specialisms
- Compound semiconductors
- Photonics, optoelectronics and optical communications
- Lasers and quantum electronics