PhD scholarship in MEMS tuneable VCSELs

DTU Fotonik
onsdag 20 mar 19

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Frist 20. april 2019
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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 entirely 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.

Your research task will be

  • Characterization of MEMS VCSELs
  • Setup of stable test setup possibly including construction of small chamber for operating MEMS under vacuum
  • Modeling of actuator/laser/compressor including noise properties.
  • Measurement of laser sweep properties (using imbalanced interferometer and fast digitizer)
  • Construction of control signals for bidirectional actuation of MEMS and SOA gate.
  • Generation of tailored compressed signal and measurement of properties (FROG, RF spectra etc).
Candidates should have a two-year master's degree (120 ECTS points) or a similar degree with an academic level equivalent to a two-year master's degree. Processing of MEMS devices.

Knowledge and skills from optoelectronics, microelectromechanics and ultrafast optics (or optical communication) is needed to successfully complete the project. Experience from one or more of these is needed and the ability to learn the rest.

Approval and Enrolment
The scholarship for the PhD degree is subject to academic approval, and the candidate will be enrolled in one of the general degree programmes at DTU. For information about our enrolment requirements and the general planning of the PhD study programme, please see the DTU PhD Guide

The assessment will be done by Professor Ole Hansen (DTU Nanolab) and Kresten Yvind (DTU Fotonik). 

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 appointment terms
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 3 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)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: 
  • A letter motivating the application (cover letter)
  • Curriculum vitae
  • Grade transcripts and BSc/MSc diploma
  • Excel sheet with translation of grades to the Danish grading system (see guidelines and Excel spreadsheet here)
Candidates may apply prior to obtaining their master's degree but cannot begin before having received it.

Applications and enclosures received after the deadline will not be considered.

All interested candidates irrespective of age, gender, race, disability, 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.