PhD scholarship in NExt generation of Tunable LASers for optical coherence tomography

Monday 14 Oct 19

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Apply no later than 15 December 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).

We are recruiting for three PhD Studentships in Optics/Photonics/Physics for a period of 36 months with a start date anytime between 1st Febr. 2020 and 31 Jan. 2021. These are supported by the Marie Curie Innovative Training Network scheme, 860807, EU funded, jointly organised with 14 other universities, companies and hospitals in Europe. The Early Stage Researchers will spend time at DTU and at the other beneficiaries or associated partners.

Supervision will be provided in an European setting where specialized and complementary training will be provided at the training sites as well as during network events.

The studentships at DTU will be working on microelectromechanical tuneable vertical cavity surface emitting lasers (MEMS tuneable VCSELs) and fiber ring lasers using acoustic-optic tunable filters (AOTF). For the VCSELs cleanroom fabrication will be part of the projects while the ring laser will have a modelling part.

Responsibilities and tasks
We will make optimized lasers and characterize/control them with the aim of achieving large optical bandwidth and high dynamic coherence. For the VCSEL projects your research task will be 

  • Design of device at 1060nm or 1300nm using existing framework [1-2]
  • Fabrication of lasers in cleanroom with assistance from staff
  • Characterization of static laser properties.
  • Measurement of laser sweep properties (using imbalanced interferometer and fast digitizer)
  • Construction of control signals for actuation of MEMS and SOA gate.
  • Measurement of OCT signal in collaboration with partners.
For the ring laser project your research task will be 
  • Modeling of fiber ring laser using AOTF
  • Assembly of lasers.
  • Characterization of static laser properties vs. operating conditions..
  • Measurement of laser sweep properties (using imbalanced interferometer and fast digitizer)
[1] H. K. Sahoo et al., "Tunable MEMS VCSEL on Silicon Substrate," in IEEE Journal of Selected Topics in Quantum Electronics, vol. 25, no. 6, pp. 1-7, Nov.-Dec. 2019, Art no. 1700707. doi: 10.1109/JSTQE.2019.2927575

[2] T. Ansbæk, I. Chung, E. S. Semenova, O. Hansen and K. Yvind, "Resonant MEMS Tunable VCSEL," in IEEE Journal of Selected Topics in Quantum Electronics, vol. 19, no. 4, pp. 1702306-1702306, July-Aug. 2013, Art no. 1702306. doi: 10.1109/JSTQE.2013.2257164. 

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.

Knowledge and skills from optoelectronics, microelectromechanics and/or cleanroom fabrication is needed to successfully complete the project. Experience from one or more of these is needed and the ability to learn the rest. 

Due to the mobility requirement of the European Commission for ITN projects, we can only accept PhD candidates that have not been working/living in Denmark for more than a total of 12 months within the 3 years prior to employment start.

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 Kresten Yvind. 

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 “NETLAS” in subject line. 

You can read more about DTU Fotonik at   

Please submit your online application no later than 15 December 2019 (local time)To apply, please open the link "Apply online", fill out the online application form. The following must be attached in English: 

  • 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 220 employees with competences in optics. In a typical year, DTU Fotonik educates 55 PhD students from more than 25 countries and our student numbers are constantly growing. As one of Europe’s largest public photonics research departments, DTU Fotonik covers a multitude of optical disciplines ranging from fundamental light-matter interaction and optical telecommunications to applied research and innovation. Our research topics include optical sensors, lasers, LEDs, photovoltaics, ultra-high speed optical transmission systems, bio-photonics, nano-optics and quantum photonics.

Technology for people
DTU develops technology for people. With our international elite research and study programmes, we are helping to create a better world and to solve the global challenges formulated in the UN’s 17 Sustainable Development Goals. Hans Christian Ørsted founded DTU in 1829 with a clear vision to develop and create value using science and engineering to benefit society. That vision lives on today. DTU has 11,500 students and 6,000 employees. We work in an international atmosphere and have an inclusive, evolving, and informal working environment. Our main campus is in Kgs. Lyngby north of Copenhagen and we have campuses in Roskilde and Ballerup.