Hi there! My name is Håkon J. D. Johnsen. I work at NTNU, where I research nonimaging optics and solar energy, and I teach mechatronics courses to our mechanical engineering students.
Go to About
Presentation
Slides from my 2026 Nonimaging Optics Conference talk on angular control and spectral filtering in thermophotovoltaics.

Presentation
Slides from my 2026 Nonimaging Optics Conference talk on photon-recycling and angularly selective solar receiver cavities.

Presentation
Slides and notes from my SPIE Optical Systems Design talk on using phase-space methods for fast, differentiable irradiance simulation.

Presentation
Slides and notes from my SolarPACES 2024 presentation on aplanatic secondary concentrators for solar tower systems.