About Me

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.

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Recent Posts

Angular control for improved spectral filtering in thermophotovoltaics

Angular control for improved spectral filtering in thermophotovoltaics

Presentation

Slides from my 2026 Nonimaging Optics Conference talk on angular control and spectral filtering in thermophotovoltaics.

Photon-recycling cavities for high-temperature solar receivers

Photon-recycling cavities for high-temperature solar receivers

Presentation

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

Differentiable phase-space simulation of irradiance

Differentiable phase-space simulation of irradiance

Presentation

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

Aplanatic secondary concentrators for solar towers

Aplanatic secondary concentrators for solar towers

Presentation

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

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