Michael Alexander Bergmann

Showing 35 publications

2024

Ultraviolet-B Resonant-Cavity Light-Emitting Diodes with Tunnel Junctions and Dielectric Mirrors

Estrella Torres, Joachim Ciers, Michael Alexander Bergmann et al
ACS Photonics. Vol. 11 (8), p. 2923-2929
Journal article
2023

The quest for ultraviolet vertical-cavity surface-emitting lasers

Åsa Haglund, Filip Hjort, Johannes Enslin et al
2023 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2023
Paper in proceeding
2023

Increased Light Extraction of Thin-Film Flip-Chip UVB LEDs by Surface Texturing

Michael Alexander Bergmann, Johannes Enslin, Martin Guttmann et al
ACS Photonics. Vol. 10 (2), p. 368-373
Journal article
2022

Influence of detuning and surface roughness on the lasing threshold of optically pumped UVB VCSELs

Giulia Cardinali, Filip Hjort, Nando Prokop et al
Other conference contribution
2022

Out of the blue: UV VCSELs

Åsa Haglund, Filip Hjort, Johannes Enslin et al
Proceedings of SPIE - The International Society for Optical Engineering. Vol. PC12001
Paper in proceeding
2022

Electrochemical etching – a key enabler for thin-film VCSELs and LEDs?

Åsa Haglund, Filip Hjort, Johannes Enslin et al
GaN Marathon
Paper in proceeding
2022

Thin-film flip-chip UVB LEDs realized by electrochemical etching

Michael Alexander Bergmann, Johannes Enslin, Martin Guttmann et al
Other conference contribution
2022

Low-Threshold AlGaN-based UVB VCSELs enabled by post-growth cavity detuning

G. Cardinali, Filip Hjort, N. Prokop et al
Applied Physics Letters. Vol. 121 (10)
Journal article
2022

Thin-film UV VCSELs and LEDs by electrochemical etching

Åsa Haglund, Filip Hjort, Johannes Enslin et al
Proceedings of SPIE - The International Society for Optical Engineering. Vol. PC12022
Paper in proceeding
2022

Blue and UV VCSELs: today and tomorrow

Åsa Haglund, Giulia Cardinali, Lars Persson et al
Other conference contribution
2022

UV VCSELs – this is the way

Åsa Haglund, Giulia Cardinali, Lars Persson et al
9th Workshop on Physics and Technology of Semiconductor Lasers
Paper in proceeding
2022

Single-mode lasing in optically pumped UVB VCSELs with circular relief structures

Giulia Cardinali, Filip Hjort, Joachim Ciers et al
International Workshop on Nitride semiconductors (IWN)
Paper in proceeding
2021

Advances in ultraviolet-emitting vertical-cavity surface-emitting lasers

Filip Hjort, Johannes Enslin, Munise Cobet et al
Proceedings of SPIE - The International Society for Optical Engineering. Vol. 11686
Paper in proceeding
2021

A 310 nm Optically Pumped AlGaN Vertical-Cavity Surface-Emitting Laser

Filip Hjort, Johannes Enslin, Munise Cobet et al
ACS Photonics. Vol. 8 (1), p. 135-141
Journal article
2021

Out of the blue: ultraviolet vertical-cavity surface-emitting lasers

Åsa Haglund, Filip Hjort, Johannes Enslin et al
Other conference contribution
2021

Impact of polarization fields on electrochemical lift-off of GaN membranes

Joachim Ciers, Michael Alexander Bergmann, Filip Hjort et al
Other conference contribution
2021

Smooth GaN membranes by polarization-assisted electrochemical etching

Joachim Ciers, Michael Alexander Bergmann, Filip Hjort et al
Applied Physics Letters. Vol. 118 (6)
Journal article
2020

Prospects and challenges for UV LEDs and UV lasers with tunnel junctions

Tim Wernicke, Luca Sulmoni, Martin Guttmann et al
SPIE Photonics West, OE107: Gallium nitride materials and devices XV
Other conference contribution
2020

Recent progress for blue VCSELs and challenges to move to UV

Åsa Haglund, Filip Hjort, Johannes Enslin et al
Other conference contribution
2020

Thin-film flip-chip UVB LEDs realized by electrochemical etching

Michael Alexander Bergmann, Johannes Enslin, Filip Hjort et al
Applied Physics Letters. Vol. 116 (12), p. 121101-
Journal article
2020

A 310 nm optically pumped AlGaN VCSEL with two dielectric distributed Bragg reflectors

Filip Hjort, Johannes Enslin, Munise Cobet et al
Other conference contribution
2020

Are blue and ultraviolet VCSELs a reality or just a dream?

Åsa Haglund, Filip Hjort, Johannes Enslin et al
Other conference contribution
2019

UVB-emitting vertical-cavity surface-emitting lasers

Filip Hjort, Johannes Enslin, Michael Alexander Bergmann et al
Other conference contribution
2019

Electrochemical etching of AlGaN for the realization of thin-film devices

Michael Alexander Bergmann, Johannes Enslin, Rinat Yapparov et al
Applied Physics Letters. Vol. 115 (18), p. 182103-
Journal article
2019

UVB-emitting vertical-cavity surface-emitting laser

Åsa Haglund, Filip Hjort, Michael Alexander Bergmann et al
Other conference contribution
2019

Blue and ultraviolet thin-film light emitters

Åsa Haglund, Michael Alexander Bergmann, Filip Hjort et al
Other conference contribution
2019

Blue and ultraviolet vertical-cavity surface-emitting lasers

Åsa Haglund, Michael Alexander Bergmann, Filip Hjort et al
Optics InfoBase Conference Papers. Vol. Part F129-CLEO_SI 2019
Paper in proceeding
2019

Pushing performance in blue and UV VCSELs by nanometer structuring

Åsa Haglund, Filip Hjort, Michael Alexander Bergmann et al
Other conference contribution
2019

Vertical AlGaN-microcavity with two dielectric distributed Bragg reflectors emitting at 330 nm

Filip Hjort, Johannes Enslin, Michael Alexander Bergmann et al
Other conference contribution
2019

Vertical microcavity based on an AlGaN membrane with two dielectric distributed Bragg reflectors emitting at 330 nm

Filip Hjort, Johannes Enslin, Michael Alexander Bergmann et al
Other conference contribution
2019

Prospects and challenges for UV LEDs and UV lasers with tunnel junctions

Tim Wernicke, Luca Sulmoni, Martin Guttmann et al
Other conference contribution
2018

Towards ultraviolet and blue microcavity lasers

Michael Alexander Bergmann, Filip Hjort, Seyed Ehsan Hashemi et al
Northen Optics and Photonics conference. Vol. 2018
Paper in proceeding
2018

Thin-film UVB LEDs enabled by electrochemical etching of AlGaN

Michael Alexander Bergmann, Johannes Enslin, Filip Hjort et al
Other conference contribution
2017

Nanoscale structuring to improve laser performance

Åsa Haglund, Seyed Ehsan Hashemi, Filip Hjort et al
Proceedings of the Stanford Chalmers Workshop on Advancing Materials Innovatively. Vol. 2017
Paper in proceeding

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