The Department of Microtechnology and Nanoscience focuses on research, innovation and education within the fields of future electronics, photonics, bio- and nanosystems. A close collaboration with Swedish and international partners within academia, industry and society enables scientific excellence and creates an innovative environment. In addition to the 200 researchers and PhD students, MC2 houses a cleanroom for micro- and nanofabrication with the latest equipment.


Information about the division and the research
The Photonics Laboratory at the Department of Microtechnology and Nanoscience (MC2), with about 30 members, conducts application oriented research in optoelectronics, fibre optics, photonic integration, as well as more fundamental research on new photonic materials. Research in optoelectronics, with an emphasis on light-emitters, started at Chalmers in the early 1980’s. Today we have the expertise and an infrastructure that covers all parts in semiconductor based light-emitter development, i.e. design and simulation, epitaxial material growth, device fabrication, and material and device characterization. We are among the leaders in the development of GaAs-based vertical cavity lasers (VCLs) emitting in the infrared regime, and since several years we also work on the realization of GaN-based VCLs emitting in the ultraviolet to blue regime.

To further strengthen our efforts we will now expand our team with a PhD student working on exploring the remarkable properties of a novel nano-photonic element referred to as a “high-contrast grating” (HCG) membrane. Together, we will investigate how the HCG can be utilized to construct resonant cavity light emitting diodes (RCLEDs) and VCLs with new functionalities and/or performance potentially outperforming that offered by existing technologies. Theoretical studies have shown that a HCG membrane can provide an extremely high light reflectance (>99.5%), and at the same time a built-in focusing ability. This could, for example, be used to overcome the challenges with realizing high quality mirrors in GaN-based VCLs (replacing the distributed Bragg reflector) or increasing the photon density in GaAs-based VCLs (enabling higher modulation speed). It has also been shown that a high-reflectivity HCG can be designed to send a small fraction of the incident light along the HCG-membrane layer, e.g. to excite an in-plane waveguide. This opens up for the compact integration of RCLEDs and VCLs in photonic integrated circuits.

Major responsibilities
As a PhD student in our laboratory you will investigate the properties of multifunctional HCG membranes realized in GaN-based, GaAs-based, and dielectric-based materials. The work will be both theoretical and experimental, and include design, fabrication and characterization of HCG membranes. For the design part, you will conduct numerical simulations using finite-element-method (FEM), rigorous-coupled-wave-analysis (RCWA), and finite-difference time-domain (FDTD) methods. For the fabrication part, you will be trained in nano-fabrication techniques using state-of-the-art equipment in our clean room facility, and for the characterization part you will build new and use existing measurement set-ups at our laboratory. In addition, you will explore the possibilities of incorporating multifunctional HCG membranes in RCLEDs and VCLs. This work will be in close collaboration with other members in our laboratory and external partners, working on developing such devices. 

Your major responsibility as a 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 departmental work, mostly as a teaching assistant, corresponding to about 10% of the working hours.

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, corresponding to at least 240 higher education credits, or equivalent in Physics or Electrical Engineering, with knowledge in optics, semiconductor physics and optoelectronics devices. Related to this, any experience from numerical simulations, fabrication in a clean room environment and/or device characterization will be a merit. You should be able to work independently as well as in a group. A good command of English is a requirement.

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

Application procedure
The application should be marked with Ref 20170612 and written in English. The application should be sent electronically and be attached as pdf-files, as below:

CV: (Please name the document: CV, Family name, Ref. number)
• CV
• Other, for example previous employments or leadership qualifications and positions of trust.
• 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 and present your qualifications.
• Previous research fields and main research results.
• Future goals and research focus. Are there any specific projects and research issues you are primarily interested in?

Other documents:
• Copies of bachelor and/or master’s thesis.
• Attested copies and transcripts of completed education, grades and other certificates, eg. TOEFL test results.

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

Application deadline: 15 March 2018

For questions, please contact:
Associate Prof. Johan Gustavsson
Mail: johan.gustavsson@chalmers.se
Phone: +46 31 772 5868

*** 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 eight Areas of Advance; Building Futures, Energy, Information & Communication Technology, Life Science, Materials Science, Nanoscience & Nanotechnology, 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!