Postdoc position: III-nitride vertical-cavity surface-emitting lasers

As the successful candidate you will play an essential role in the development of III-nitride vertical-cavity surface-emitting lasers with emission in the blue and ultraviolet wavelength range that have potential applications in flood-lights, laser-based projection, water purification, medical analysis and treatment, UV curing etc. You will be given the opportunity to work in one of the world-leading groups in the area and combine device design and numerical simulations with device processing and characterization in close collaboration with other Universities who are experts on epitaxial growth.

Information about the Photonics Laboratory and the research
The Photonics Laboratory at the Department of Microtechnology and Nanoscience (MC2), with about 35 researchers, is working on optoelectronics, ultrafast optics and fiber optical communication. Research in optoelectronics, with an emphasis on semiconductor lasers, started at Chalmers in the early 1980's. Today we have the expertise and infrastructure that covers most parts in vertical-cavity surface-emitting laser (VCSEL) development, i.e. design and simulation, laser fabrication, and material and device characterization. Realizing VCSELs in III-N-materials is associated with challenges such as achieving efficient electrical pumping due to the low electrical conductivity of those materials and realizing high quality mirrors in combination with good control of the resonator length. Over the past few years, we have developed nano structuring techniques for tailored optical feedback and a thin-film lift-off process based on electrochemical etching to be able to combine III-N-materials with high-quality mirrors. These have enabled us to demonstrate the world's first blue vertical-cavity surface-emitting lasers (VCSEL) with a high-contrast grating for polarization pinning and the shortest emission wavelength from an optically pumped VCSEL at 310 nm. We are now expanding our team to push the implementation of our thin-film VCSEL technology for both blue and ultraviolet (UV) VCSELs where one of our long-term goals is to demonstrate an electrically injected deep-UV VCSEL.

Major responsibilities
In our team your major responsibility will be to develop thin-film VCSELs from III-nitride materials emitting in the blue and ultraviolet wavelength regime. This will include further development of the electrochemical etching and exploration of tunnel junctions for electrically injected VCSELs. Your work will be mainly experimental with a focus on device fabrication using state-of-the-art equipment in our clean room as well as characterization of fabricated devices in our new measurement laboratory. In addition, you will have access to our in-house-developed VCSEL simulation tools for laser design and modeling. The work will be conducted in close collaboration with external partners who develop and grow the epitaxial material.

Qualifications
By the starting date in June-Dec. 2021, you must have a PhD degree, with knowledge in III-nitride device fabrication and characterization. The degree should generally not be older than three years. Hands-on experience from electrochemical etching of III-nitrides will be a strong merit, as well as implementations of tunnel junctions for blue or ultraviolet light-emitting diodes and lasers. Knowledge on device simulations or epitaxial growth of III-nitrides is also regarded as an asset. Important personal qualities are enthusiasm, ability to drive and conclude projects independently, creativity and problem-solving ability. Good cooperation and social abilities are also appreciated. Excellent communication skills in spoken and written English are necessary. 

Position summary
Full-time temporary employment. The position is limited to a maximum of two years (1+1).

Chalmers continuously strives to be an attractive employer. Equality and diversity are substantial foundations in all activities at Chalmers.

Our offer to you
Chalmers offers a cultivating and inspiring working environment in the dynamic city of Gothenburg. 
Read more about working at Chalmers and our benefits for employees.

Application procedure
The application should be marked with Ref 20210226 and written in English. The application should be sent electronically and be attached as pdf-files, as below:

CV: (Please name the document as: CV, Surname, Ref. number) including:
• CV, include complete list of publications
• Previous teaching and pedagogical experiences
• Two references that we can contact.

Personal letter: (Please name the document as: Personal letter, Family name, Ref. number)
1-3 pages where you:
• Introduce yourself
• Describe your previous research fields and main research results
• Describe your future goals and future research focus

Other documents:
• Attested copies of completed education, grades and other certificates.

Please use the button at the foot of the page to reach the application form. The files may be compressed (zipped).

Application deadline: 3 June, 2021

For questions, please contact:
Professor Åsa Haglund, Photonics Laboratory
E-mail: asa.haglund@chalmers.se
Phone: +46(0)31-7721592

*** Chalmers declines to consider all offers of further announcement publishing or other types of support for the recruiting process in connection with this position. *** 
   



Chalmers University of Technology conducts research and education in engineering sciences, architecture, technology-related mathematical sciences, natural and nautical sciences, working in close collaboration with industry and society. The strategy for scientific excellence focuses on our six Areas of Advance; Energy, Health Engineering, Information and Communication Technology, Materials Science, Production and Transport. The aim is to make an active contribution to a sustainable future using the basic sciences as a foundation and innovation and entrepreneurship as the central driving forces. Chalmers has around 11,000 students and 3,000 employees. New knowledge and improved technology have characterised Chalmers since its foundation in 1829, completely in accordance with the will of William Chalmers and his motto: Avancez!