Deep-UV Photonic-Crystal Surface-Emitting Lasers with Sub-Degree Beam Divergence
Paper in proceeding, 2026

We demonstrate the first optically pumped deepultraviolet photonic-crystal surface-emitting lasers operating below 280 nm. By optimizing the photonic crystal’s filling factor, single-mode emission at 279 nm with sub-degree beam divergence is achieved. These results establish PCSELs as a promising platform for high-beam-quality, high-power deep-UV semiconductor lasers.

Photonic crystal surface-emitting lasers (PCSELs)

Deep-ultraviolet (UV-C) lasers

Photonic band engineering

Author

Philippe Tassin

Chalmers, Physics, Condensed Matter and Materials Theory

Dogukan Apaydin

Chalmers, Microtechnology and Nanoscience (MC2), Photonics

Hjalmar Andersson

Chalmers, Physics, Condensed Matter and Materials Theory

Lukas Uhlig

Technische Universität Chemnitz

Sarina Graupeter

Technische Universität Berlin

Joachim Ciers

Chalmers, Microtechnology and Nanoscience (MC2), Photonics

Giulia Cardinali

Chalmers, Microtechnology and Nanoscience (MC2), Photonics

Erik Strandberg

Chalmers, Microtechnology and Nanoscience (MC2), Photonics

Tim Wernicke

Technische Universität Berlin

Michael Kneissl

Technische Universität Berlin

Ulrich Theodor Schwarz

Technische Universität Chemnitz

Åsa Haglund

Chalmers, Microtechnology and Nanoscience (MC2), Photonics

International Conference on Metamaterials, Photonic Crystals and Plasmonics

24291390 (eISSN)

1336-1337

16th International Conference on Metamaterials, Photonic Crystals and Plasmonics, META 2026
Dublin, Ireland,

Metasurface-Emitting Lasers: Tomorrows Light Sources for Applied Photonics

Knut and Alice Wallenberg Foundation (2020.0119), 2021-07-01 -- 2026-06-30.

Subject Categories (SSIF 2025)

Atom and Molecular Physics and Optics

Other Physics Topics

More information

Latest update

9/22/2026