Postdoc in Fabrication of MEMS Tuneable VCSELs

Postdoc in Fabrication of MEMS Tuneable VCSELs

Technical University of Denmark (DTU)

2800 Kgs. Lyngby, Denmark

The Nanophotonic Devices Group manufactures and characterizes optoelectronic and photonic devices for applications in communication and medical imaging. Fabrication is done in DTU Nanolab where facilities for silicon, GaAs and InP devices are available. Our optical labs are in the new building of DTU Fotonik. The work have enabled a number of high profile results on nanoscale lasers, nonlinear integrated photonics and a spinout company on lasers for optical coherence tomography (OCT).

Microelectromechanical tuneable vertical cavity surface emitting lasers (MEMS tuneable VCSELs) have shown remarkable performance for optical coherence tomography where fast wavelength sweep and a large dynamic coherence have enabled 3D imaging of large volumes. In the STEPS project we will characterize, use and expand the properties of MEMS tuneable VCSELs to open new application areas.

Responsibilities and tasks
We will fabricate optimized lasers and characterize/control them with the aim of achieving unprecedented dynamic coherence which will enable arbitrary pulse generation with subpicosecond time resolution [Yvind WO2015071379]. This will be an entire new way of generating such high-bandwidth, high peak power signals and allows direct electrical control of the emission. A post doc will work on fabricating optimized devices while the PhD student will demonstrate the device in the lab, both assisted by existing staff. The basic VCSEL structure has already been developed [Sahoo] but improvements are needed to accomplish the goals of the project, most notably fabrication of a device with intracavity AR coating, bidirectional tuning and with vacuum around the MEMS to improve the coherence and control of the device. Also, work on devices with electrical injection should be done.

Research task for you will be:

  • Fabrication of SOI/InP(or GaAs)/dielectric DBR MEMS VCSEL for bidirectional tuning
  • Fabrication of device with intracavity AR coating.
  • Fabrication of VCSEL with partial vacuum in cavity around MEMS.
  • Development of electrical injected device
  • Device characterization
  • Assistance to PhD student

[Sahoo]: Tunable MEMS VCSEL on Silicon substrate.

  • Candidates should have a PhD degree or equivalent.
  • Experience in cleanroom fabrication of complex optoelectronic devices is mandatory.
  • Preference will be given to applicants with experience in:
  • Wafer bonding
  • Processing of InP or GaAs devices.
  • Deposition of dielectric mirrors
  • Processing of MEMS devices
  • Characterization of optoelectronic devices.

We offer
DTU is a leading technical university globally recognized for the excellence of its research, education, innovation and scientific advice. We offer a rewarding and challenging job in an international environment. We strive for academic excellence in an environment characterized by collegial respect and academic freedom tempered by responsibility.

Salary and terms of employment
The appointment will be based on the collective agreement with the Danish Confederation of Professional Associations. The allowance will be agreed upon with the relevant union. The period of employment is 2 years.

You can read more about career paths at DTU here.

Further information
Further information may be obtained from Kresten Yvind, tel.: +45 4525 6366. mark email by “STEPS PD” in subject line.

You can read more about DTU Fotonik at

Application procedure
Please submit your online application no later than 20 April 2019 (local time). Apply online at Applications must be submitted as one PDF file containing all materials to be given consideration. To apply, please open the link “Apply online”, fill out the online application form, and attach all your materials in English in one PDF file. The file must include:
  • Application (cover letter)
  • CV
  • Diploma (MSc/PhD)
  • List of publications
Applications and enclosures received after the deadline will not be considered.

All interested candidates irrespective of age, gender, disability, race, religion or ethnic background are encouraged to apply.

DTU Fotonik has 210 employees with competences in optics and is one of the largest centers in the world based solely on research in photonics. Research is performed within optical sensors, lasers, LEDs, photovoltaics, ultra-high speed optical transmission systems, bio-photonics, nano-optics and quantum photonics.

DTU is a technical university providing internationally leading research, education, innovation and scientific advice. Our staff of 6,000 advance science and technology to create innovative solutions that meet the demands of society, and our 11,200 students are being educated to address the technological challenges of the future. DTU is an independent academic university collaborating globally with business, industry, government and public agencies.

Please apply via recruiter’s website.