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Phd fellow in physics at the Niels Bohr Institute, Faculty of Science

Low phase noise micro resonator combs and atomic clocks

With the invention of frequency combs precision measurements and their applications have accelerated. In combination with state-of-the-art atomic clocks frequency combs allow for measuring frequency rations a the fractional level of 10e-18 or looking for physics beyond the standard model. Frequency combs also have a number of tantalizing applications in for example high speed optical communication and generation of ultralow phase noise microwave signals.

This project is a part of the center of excellence (grundforskningscenter) SPOC located at DTU and aims at transferring the phase stability of atomic or molecular clocks to combs generated from micro-resonator structures. The platform is the new and promising AlGaAs-on-insulator nano-wave guide, but also other materials such as Si3N4 may be targeted.              

The optical frequency standard targeted here will be the molecular acetylene reference at 1543 nm or the molecular iodine reference at 514 nm (triple of 1542 nm). The ultimate goal is to generate a compact unit clock plus micro resonator combs that may compete with the current definition of the second. Such compact systems find applications in both fundamental sciences as well as in high speed optical communication, space science and high speed electronics.      The PhD project will be carried out in collaboration between the Niels Bohr Institute, Unviersity of Copenhagen and the High Speed Optical Communications group (HSOC) and Nanophotonic Devices group in the Department of Photonic Engineering at the Technical University of Denmark. Workplace will be at Niels Bohr Institute, Blegdamsvej 17, 2100 Copenhagen

Principal supervisors are Jan W. Thomsen (NBI) and Leif K. Oxenløve (DTU).

Job description The PhD position is a 3 year position with focus on experimental realizations and your key tasks will be:

  • Characterization and optimization of phase noise in micro-resonators combs
  • Explore possibilities for soliton formation in micro resonator structures.
  • Design of state-of-the-art molecular clocks and frequency normal for the telecom window.
  • Design and test of micro resonator comb resonance auto lock to clock references
  • Reducing phase noise in micro resonator frequency combs via atomic and molecular frequency standards.    
  • As part of the Danish PhD program, the student will follow a number of PhD courses as well as take part in teaching. Furthermore, there will be a possibility to carry out a longer external research stay.

Qualifications Candidates should have a master's degree in physics/engineering or a similar degree with an academic level equivalent to the master's degree in physics/engineering with good results and good English skills.

Application Procedure Deadline: May 30. The application, in English, must be submitted electronically by clicking APPLY NOW below and will be subject to academic approval. The candidate will be enrolled at the PhD program of the Niels Bohr Institute, University of Copenhagen.

In the application please include:

  • CV
  • Diploma and transcripts of records (BSc and MSc)
  • Other information for consideration, e.g. list of publications (if any)
  • Full contact details (Name, address, telephone & email) of 1-3 professional referees

Assessment The assessment of the applicants will be made by Professor Leif K. Oxenløve (DTU), Associate Professor Jan W. Thomsen (NBI) and Associate Professor Michael Galili (DTU) 

Stimulating work environment We offer an interesting and challenging job in a stimulating international environment focusing on education, research, scientific advice and innovation, which contribute to enhancing the economy and improving social welfare. We strive for academic excellence, collegial respect and freedom tempered by responsibility. The Technical University of Denmark (DTU) is a leading technical university in northern Europe and benchmarks with the best universities in the world. 

Terms of employment The Memorandum on Job Structure covers the position for Academic Staff. Terms of appointment and payment accord to the agreement between the Ministry of Finance and The Danish Confederation of Professional Associations on Academics in the State. The starting salary is currently at a minimum DKK 312.879 including annual supplement (+ pension up to DKK 43.219). Negotiation for salary supplement is possible

The University wishes our staff to reflect the diversity of society and thus welcomes applications from all qualified candidates regardless of personal background.


Københavns Universitet giver sine knap 10.000 medarbejdere muligheder for at udnytte deres talent fuldt ud i et ambitiøst, uformelt miljø. Vi sikrer traditionsrige og moderne rammer om uddannelser og fri forskning på højt internationalt niveau. Vi søger svar og løsninger på fælles problemer og gør ny viden tilgængelig og nyttig for andre.


Jan Westenkær Thomsen


Ansøgningsfrist: 30-05-2017
Ansættelsesform: Tidsbegrænset periode
Ansættelsesdato: 01-07-2017
Afdeling/Sted: Niels Bohr Institutet

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