Internship | Modified fiber tip to improve light in-coupling efficiency from various light sources



Education type

university (wo)


Internship and graduation project

Hours a week

Fulltime – 40


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Optical fiber devices are used in many optical experiments, technology demonstration, and advanced instruments. Coupling light from free space to optical fibers is important for many applications, such as, quantum technology (single-photon collection) or biophotonics (in vivo imaging). However the light in-coupling efficiency for common step-index fiber drops quickly when the angle of incidence increases. In this project, we will explore various strategies aiming to improve the coupling efficiency by the fiber tip especially at large angle of incidence.

What will be your role?

Modified fiber tip using diffractive nano-structures presents a promising solution. When light impinges on diffractive structure also known as meta-surface, diffraction wave is generated. The nano-structure can be designed such that the diffraction wave matches with the guided mode of the optical fiber. In this project, we will study several diffractive nano-structures together with the light in-coupling in optical fiber. Numerical simulation will be used to model the light interaction, diffraction and guided propagation effects. For each studied nano-structure, we will also investigate the manufacture methods.
In a short introductory period, you will learn the basic principles of in-coupling efficiency in optical fiber. Through the project you will:
  • Perform a literature review on the modified fiber tip for light in-coupling in optical fiber;
  • Develop a numerical model to study the modified fiber tip with nano-structure;
  • Design of diffractive nano-structure;
  • Work in an multidisciplinary team;
  • Report on research findings.

How do you want to contribute to tomorrow's world? How big can your impact be? Come and work at TNO and envision it.

What we expect from you

  • Master level study on physics;
  • Knowledge on optics preferably;
  • Experience in computation tools and languages such as, Matlab / Python.

What you’ll get in return

You want to work on the precursor of your career; a work placement gives you an opportunity to take a good look at your prospective future employer. TNO goes a step further. It’s not just looking that interests us; you and your knowledge are essential to our innovation. That’s why we attach a great deal of value to your personal and professional development. You will, of course, be properly supervised during your work placement and be given the scope for you to get the best out of yourself. Naturally, we provide suitable work placement compensation.

TNO as an employer

At TNO, we innovate for a healthier, safer and more sustainable life. And for a strong economy. Since 1932, we have been making knowledge and technology available for the common good. We find each other in wonder and ingenuity. We are driven to push boundaries. There is all the space and support for your talent and ambition. You work with people who will challenge you: who inspire you and want to learn from you. Our state-of-the-art facilities are there to realize your vision. What you do at TNO matters: impact makes the difference. Because with every innovation you contribute to tomorrow’s world. Read more about TNO as an employer.

The selection process

After the first CV selection, the application process will be conducted by the concerning department. TNO will provide a suitable internship agreement. If you have any questions about this vacancy, you can contact the contact person mentioned below.

Due to Covid-19 and the consequent uncertainties and restrictions, students who are not residing in the Netherlands may currently not be able to start an internship or graduation project at TNO.

Has this job opening sparked your interest?

Then we’d like to hear from you! Please contact us for more information about the job or the selection process. To apply, please upload your CV and covering letter using the ‘apply now’ button.

Contact: Man Xu
Phone number: +31 (0)6-818 99423

Note that applications via email and third party applications are not taken into consideration.


Apply now