PhD Scholarships on Efficient On-Chip Second Harmonic Generation for Chip-Scale Optical Atomic Clock

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Ansøgningen slutter: October 15, 2022
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Stillings beskrivelse

The Nanophotonic Devices Group at DTU Electro is seeking a PhD candidate to develop an on-chip ultra-efficient frequency doubler or second harmonic generation (SHG) device that can be heterogeneously integrated with an on-chip frequency comb source for optical atomic clock applications. The Ph.D. project is part of the European Innovation Council Pathfinder Project “Chip-Scale Optical Atomic Clock” (CSOC), which aims to develop a chip-scale optical atomic clock by combining the recent advances in mode-locked lasers, Kerr frequency combs, highly-nonlinear III-V waveguides. The CSOC project is conducted by a consortium including academic partners (Gent University and École polytechnique fédérale de Lausanne) and industrial partners (Menlo System and Ligentec).

A chip-scale self-referenced optical comb enables a fully integrated optical atomic clock that outperforms classical counterparts in terms of resolution and stability by two orders of magnitude using optical rather than RF transitions. Such atomic clocks have a wide range of applications, including GPS and timing for modern wireless communication networks. Such a comb source can enable another set of applications, including optical frequency synthesizers, fast lidar units, microwave photonic signal generation, and manipulation, as well as spectroscopy which are currently limited to a lab setting.

Responsibilities and qualifications
Compared with state-of-the-art frequency doublers, you will push the second harmonic generation efficiency by orders of magnitude. You will investigate the nonlinear effect (second-order nonlinearity) in our developed high-confinement AlGaAs waveguide platform and design a frequency doubler at 1550 nm. The fabrication of the frequency doubler will be performed in the DTU Nanolab cleanroom. You will characterize the in-house fabricated nonlinear components. You will also need to collaborate closely with our partners to realize the full integration of the whole optical atomic clock system.

Your main tasks are listed below:

  • SHG device modeling considering the anisotropy in electrooptic coefficients, as well as thermal and electro-optic tuning;
  • Process development for ultralow loss electrostatic tuned SHG device;
  • Design and fabrication of thermo-optic and electro-optic phase shifters;
  • Linear and nonlinear characterization of fabricated SHG devices;
  • Design and characterization of hybrid integrated AlGaAs/SiN passive circuits;

You must 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. You should have a background in integrated optics, nonlinear optics, and numerical simulation. Experience in nanofabrication and optical characterization is preferred.

Approval and Enrolment
The scholarships for the Ph.D. degree are subject to academic approval, and the candidates will be enrolled in one of the general degree programmes at DTU. For information about our enrolment requirements and the general planning of the Ph.D. study programme, please see DTU’s rules for the PhD education.  

The assessment of the applicants will be made by Senior Researcher Minhao Pu.

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.The Ph.D. project can start as early as 1 November 2022.  

You can read more about career paths at DTU here.   

Further information
Further information may be obtained from Senior Researcher Minhao Pu,, tel.: +45 4525 6358.

You can read more about DTU Electro at  

If you are applying from abroad, you may find useful information on working in Denmark and at DTU at DTU – Moving to Denmark. Furthermore, you have the option of joining our monthly free seminar “Ph.D.” for all questions regarding the practical matters of moving to Denmark and working as a Ph.D. at DTU.

Application procedure
Your online application must be submitted no later than 30 September 2022 (Danish 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 (in English), including an official description of grading scale
  • Recommendation letters (preferred)
  • Publication list (if applicable)

You may apply prior to ob­tai­ning your master’s degree but cannot begin before having received it.

Applications 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 Electro has 220 employees with competencies in optics. In a typical year, DTU Fotonik educates 55 Ph.D. 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 13,400 students and 5,800 employees. We work in an international atmosphere and have an inclusive, evolving, and informal working environment. DTU has campuses in all parts of Denmark and Greenland, and we collaborate with the best universities around the world.