To any future PhD students, choose a research field that is really interesting to you. A doctoral project is a long, arduous process, along the way you will face many challenges and many moments of doubt and discouragement. It is much easier to overcome these adversities if the research that we conduct is not only our job but also our passion. It is also worth mentioning that when, after many months of designing, simulation, calculations and construction, the data from the experiment are finally obtained, it is a truly joyful moment full of fulfilment!