Wide bandgap optoelectronics

We develop ultraviolet and visible light emitters with a focus on microcavity lasers and thin-film flip-chip LEDs.

Group members:

Åsa Haglund

Joachim Ciers​  

Michael Bergmann
Andreas Liudi Mulyo​

PhD students
Doğukan Apaydın​
Lars Persson
Estrella Torres​

Master students
Alexandra Mitsiou



Filip Hjort “Ultraviolet vertical-cavity surface-emitting lasers and vertical microcavities for blue lasers”​, PhD. 2021. Present affiliation: NVIDIA.
Michael Bergmann, Thin-film ultraviolet light-emitting diodes realized by electrochemical etching of AlGaN, PhD. 2020. Present affiliation, Chalmers University of Technology​
Ehsan Hashemi, “Optical Guiding and Feedback in Gallium Nitride Based Vertical Cavity Surface Emitting Lasers”, PhD 2016. Present affiliation: Tobii​
Martin Stattin, “Elements of AlGaN-Based Light Emitters” PhD 2013. Present affiliation: II-VI​

Master students
Erik Strandberg, “Design of a photonic-crystal surface-emitting laser for emission in the ultra-violet”, 2021.
Mahdi Mohajeri​​, ”Fabrication of high-reflectivity HfO2/SiO2 distributed Bragg reflectors for UVC VCSELs”, 2020
Lars Persson, ”Thermal and optical simulations of blue- and UV-emitting vertical-cavity surface-emitting lasers”, 2020
Giulia Cardinali , ” Thermal management of ultraviolet LEDs and VCSELs: computer-aided multiphysics optimization”, 2019
Saeed Taheri, “Probing optical properties of nano-structured materials by measuring micro-reflectivity spectrum”, 2018
Marcus Bengths, “Design of nanowire-based vertical-cavity surface-emitting lasers”​, 2018
Filip Hjort, “Electrical Conductivity of n-doped GaN-based Distributed Bragg Reflectors”, 2016
Wei Wang, “Direct integration of CVD graphene on p-GaN as transparent conductive films for light-emitting diodes”, 2016
Rickard Andersson, “Investigation of electrical contacts on n-type 4H-SiC”, 2015
Salwa Salam Cynthia, “TiO2/SiO2 Distributed Bragg Reflectors by Sputtering for GaAs based VCSELs”, 2014 
Marcus Johansson, “HfO2/SiO2 Distributed Bragg Reflectors for GaN-based VCSELs”, 2013
Stefan Carlsson, “Towards High Contrast Gratings in the GaN/ZnO Materials System”, 2013
César Javier Lockhart de la Rosa, “Graphene as Transparent Conductive Film for GaN-Based Vertical Cavity Surface Emitting Lasers”​, 2012                

Giulia Cardinali, Politecnico di Torino (Italy), 2019
Johannes Enslin, TUB (Germany)​​, 2019
TsuChi Chang, NCTU (Taiwan), 2018

Highlights in media:

Elektroniktidningen, June 2021
"Nytt världsrekord i laserlabbet"

Compound Semiconductor, vol. 27, issue 3, May 2021
"Out of the blue: UV VCSELs"

MC2 researcher gets major grant from The European Research Council, 10 Dec., 2019

Semiconductor Today, 28 Nov., 2019 
lectrochemical membrane release for aluminium gallium nitride devices”

Elektroniktidningen, 12 June 2019 
”Chalmers lyfter UV-lysdioden ifrån substratet”

Framtidens forskning, 26 June, 2018

Elektroniktidningen, 8 Feb., 2017
“On the way towards blue surface emitting laser”
“Mot blå ytemitterande laser”
http://etn.se/index.php/nyheter/63170-visar-vaegen-mot-bla-ytemitterande-laser​, Anna Wennberg

Youtube video by the Foundation for Strategic Research, 2017.
”Blue lasers might become the future lighting”, https://www.youtube.com/watch?v=YEe30yg-nuA
“Blå lasrar kan bli framtidens belysning”, https://www.youtube.com/watch?v=7-a299Vtr4w&t=19s​​​



Carl Tryggers stiftelse​

Page manager Published: Mon 06 Dec 2021.