Jobbtitel:
PhD student position in GaN-based Vertical-Cavity Surface-Emitting Lasers

Arbetsbeskrivning:

Information about the division

The Photonics Laboratory at the Department of Microtechnology and Nanoscience, with about 30 members, conducts application oriented research in optoelectronics and fibre optics, as well as more fundamental research on new photonic materials. Research in optoelectronics, with an emphasis on semiconductor lasers, started at Chalmers in the early 1980’s. Today we have the expertise and an infrastructure that covers all parts in VCSEL development, i.e. design and simulation, epitaxial growth, laser fabrication, and material and device characterization. We are among the leaders in the development of vertical cavity surface emitting lasers (VCSELs), emitting in the infrared regime, and since five years we also have a team focusing on VCSELs in GaN-based materials emitting in the ultraviolet to blue regime. To further strengthen our efforts we will now expand our team with a PhD student working on GaN-based VCSELs.

The VCSEL is a semiconductor laser, which today is used mainly in short-reach data communication links, computer mice and sensors for consumer applications. Due to its low power consumption, easy integration into 2D arrays, and low-cost it has also become very attractive for application areas such as general lighting, bio-sensors and medical diagnosis. However, these applications require emission wavelengths in the blue-UV regime instead of the infrared. To reach those shorter emission wavelengths the laser must be made in a different material system, and one such material system is nitrogen combined with group III materials, i.e. GaN, AlGaN, AlInN and InGaN. Unfortunately, realizing VCSELs from III-nitride materials pose some challenges such as achieving an 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. As a result, the performance of electrically pumped GaN-based VCSELs presented so far do not meet the requirements for real-world applications. The aim of this project is to develop novel concepts to push the performance of blue-emitting GaN-based VCSELs closer to that of infrared GaAs-based VCSELs.

Major responsibilities

As a PhD student in our group you will be exploring different schemes for ultraviolet-to-blue-emitting lasers in GaN-based materials. Your work will be mainly experimental and you will be trained in device fabrication using state-of-the-art equipment in our clean room as well as characterization of fabricated devices in our measurement laboratory. In addition, you will have access to our in-house-developed VCSEL simulation tools for laser design and modelling. Part of the work will be conducted in close collaboration with external partners. Your major responsibility as PhD student is to pursue your own doctoral studies. You are expected to develop your own ideas and communicate the results of your research orally as well as in written form. The position includes 10% departmental work, mostly as a teaching assistant.

Position summary

Full-time temporary employment. The position is limited to a maximum of five years.

Qualifications

By the starting date, you must have a Master of Science degree or equivalent in Physics or Electrical Engineering, with knowledge in semiconductor physics and optoelectronic devices. A genuine interest in device fabrication and characterization is essential. Any experience from device design, semiconductor device fabrication in a clean room environment or device characterization is a merit. You should be able to work independently as well as in a group. Any experience from device simulations, device fabrication in a clean room environment or device characterization will be a merit. Fluent in English is a requirement. 

Chalmers continuously strives to be an attractive employer. Equality and diversity are

Timmar per vecka: Heltid/ Ej specificerat

Arbetsgivare Namn: Chalmers Tekniska Högskola AB

Arbetsgivare adress:
Chalmers tekniska högskola AB 41296 Göteborg 41296 Göteborg

Form av kontakt:
titel : telefon 1: () telefon 2: () mobil: e-post:

Jobb kort beskrivning: University and higher education teachers

Land: Sweden

Område: Västra Götalands län

Avtalstid: Permanent

Typ av kontrakt: Full time

Källa till jobberbjudande: Public Employment Service of Sweden(AMS)

Hur man ansöker: Other - see free text