Rate My Professor Paul Verrinder

Paul Verrinder serves as Assistant Professor in the Department of Electronics and Nanoengineering at Aalto University, Finland. He obtained his PhD in Electrical and Computer Engineering from the University of California, Santa Barbara in 2023. His doctoral thesis, titled "Gallium Arsenide Lasers and Monolithic Integration on Silicon," under the supervision of Jonathan Klamkin, introduced a monolithic active-passive photonic integrated circuit platform on gallium arsenide extending operations to 1030 nm wavelengths. Achievements encompassed state-of-the-art Fabry-Perot lasers exhibiting 98% injection efficiency, exceeding 240 mW output power for broad-area devices, and a threshold current density of 94 A/cm². Widely tunable lasers demonstrated over 20 nm of continuous wavelength tuning with more than 30 mW output power. Further advancements included the first electrically pumped GaAs quantum dot lasers grown entirely by metalorganic chemical vapor deposition heteroepitaxy on silicon, alongside progress in selective area heteroepitaxy for seamless integration with silicon photonics.

Currently at Aalto University, Verrinder leads the SPIDAR project (2025-2029) on space debris mapping via photonic integrated circuit lidar and contributes to investigations into the thermodynamics of light for optical refrigerators and thermal trampolines. His research centers on photonic integrated circuits, compound semiconductor devices such as tunable lasers, LEDs, and phase modulators, GaAs platforms, and heterogeneous integration on silicon. Prominent publications feature "A review of photonic systems-on-chip enabled by widely tunable lasers" (IEEE Journal of Quantum Electronics, 2022), "Gallium arsenide photonic integrated circuit platform for tunable laser applications" (IEEE Journal of Selected Topics in Quantum Electronics, 2021), "Photonic integrated circuits for precision spectroscopy" (CLEO: Science and Innovations, 2020), "InAs/GaAs quantum dot lasers on CMOS-compatible (001) silicon by MOCVD direct heteroepitaxy" (CLEO: Science and Innovations, 2023), "Broadband Optical Phase Modulator with Low Residual Amplitude Modulation" (Integrated Photonics Research, Silicon and Nanophotonics, 2022), and "Regrowth free monolithic integration platform on GaAs using vertical twin waveguides" (Proceedings of SPIE, 2026). These works drive innovations in precision spectroscopy, lidar systems, optical beamsteering, and cost-effective photonic manufacturing.