PhD Position(s) Diffractive Electron Imaging of Surfaces

PhD Position(s) Diffractive Electron Imaging of Surfaces Challenge: How do we watch material surfaces evolve? Change: Building a surface-sensitive diffractive microscope. Impact: Enabling high-resolution imaging of surfaces during operation.

We are looking for two PhD candidates to join the Curious Beams Lab at Delft University of Technology and develop a new approach to imaging materials surfaces with electrons. The positions are part of BEAMSurf: Diffractive Atomic-Scale Surface Imaging with Backscattered Electrons, an ERC Starting Grant project led by Dr. Georgios Varnavides. Surfaces control many of the properties and processes that determine material functionality, from chemical reactions in catalysis to interfaces in nanoelectronic devices. Yet, observing surfaces at high spatial resolution while they operate remains challenging. BEAMSurf will develop a new scanning electron microscope that uses coherent backscattered electrons for diffractive imaging of surfaces, with the potential to overcome conventional resolution limits for low-energy SEM. As a PhD candidate, you will help build the experimental and computational foundations of this imaging technique. The two PhD candidates will have complementary roles and work alongisde a postdoctoral researcher leading the instrumentation development. PhD 1: Electron Optics and Experimental Imaging You will help develop and experimentally realize the new electron-optical imaging platform. Working closely with the postdoc, you will design, characterize, and integrate miniature electron-optical components into a high-vacuum SEM. A central challenge is to separate the desired backscattered electron signal from the primary beam and direct it towards a dedicated detector. Your work will span electron optics, ray tracing simulations, nanofabrication, vacuum technology, and experimental microscopy. As the project develops, you will also help establish the experimental imaging methodology and optimize the microscope for diffractive imaging. This position is suited to candidates interested in building new instrumentation and working across physics and engineering. Experience with electron optics, electromagnetic simulation, MEMS, nanofabrication, vacuum systems or instrumentation is valuable but not required. PhD 2: Computational Imaging and Surface Science You will develop the computational methods needed to extract high-resolution surface information from coherent backscattered electron measurements. You will develop forward models and inverse-scattering approaches for reflection-mode electron imaging, using simulations and experimental reconstructions to understand the capabilities and limitations of the technique. As the experimental platform matures, you will work closely with the instrumentation team to apply these methods to experimental measurements and establish high-resolution surface imaging. An important goal is to move beyond static images towards studying surfaces as they evolve, including processes such as oxidation, interfacial reactions, and electrically driven changes. This position is suited to candidates interested in computational imaging, inverse problems, electron scattering, open-source numerical techniques, and/or surface science. Experience with electron microscopy datasets is useful but not essential. Research Environment: You will join the Curious Beams Lab, led by Dr. Georgios Varnavides, within the Microscopy and Instrumentation Techniques (MInT) cluster of the Department of Imaging Physics at TU Delft, Applied Sciences. The MInT cluster brings together multiple research groups working across electron microscopy, from semiconductor inspection and metrology, to cryogenic electron microscopy for biological samples. The cluster has access to state-of-the-art field-emission SEMs and FIB-SEMS, with a new microscope being acquired primarily for this project. More broadly, the ImPhys department provides an interdisciplinary environment spanning multiple imaging modalities, wavelengths, and length scaels, including extreme ultraviolet imaging, optical super-resolution, ultrasound and MRI, as-well as AI-based medical imaging.

We are looking for curious and motivated researchers who want to develop a new imaging technology from fundamental physics through to experimental demonstration. You have: An MSc degree, or equivalent, in physics, applied physics, electrical engineering, mechanical engineering, materials science, computer science, or a closely related field. A strong interest in experimental physics, electron microscopy, imaging science, or a related area. The ability to work independently while contributing actively to a collaborative research team. Strong analytical and problem-solving skills. Good written and spoken English communication skills. You are available to start in 2027, with some flexibility around the exact start date. For the electron-optics and experimental-imaging direction, experience or interest in electron optics, electromagnetic simulation, nanofabrication, MEMS, vacuum systems, instrumentation, electronics or experimental microscopy is particularly valuable. For the computational-imaging and surface-science direction, experience or interest in scientific programming, numerical simulation, inverse problems, computational imaging, diffraction, electron microscopy or materials characterization is particularly valuable.

Doctoral candidates will be offered a 4-year period of employment in principle, but in the form of 2 employment contracts. An initial 1,5 year contract with an official go/no go progress assessment within 15 months. Followed by an additional contract for the remaining 2,5 years assuming everything goes well and performance requirements are met. Salary and benefits are in accordance with the Collective Labour Agreement for Dutch Universities, increasing from €3204 - €4051 gross per month, from the first year to the fourth year based on a fulltime contract (38 hours), plus 8% holiday allowance and an end-of-year bonus of 8.3%. As a PhD candidate you will be enrolled in the TU Delft Graduate School. The TU Delft Graduate School provides an inspiring research environment with an excellent team of supervisors, academic staff and a mentor. The Doctoral Education Programme is aimed at developing your transferable, discipline-related and research skills. The TU Delft offers a customisable compensation package, discounts on health insurance, and a monthly work costs contribution. Flexible work schedules can be arranged. Will you need to relocate to the Netherlands for this job? TU Delft is committed to make your move as smooth as possible! The HR unit, Coming to Delft Service , offers information on their website to help you prepare your relocation. In addition, Coming to Delft Service organises events to help you settle in the Netherlands, and expand your (social) network in Delft. A Dual Career Programme is available, to support your accompanying partner with their job search in the Netherlands.

Working at TU Delft means contributing to solutions that really make a difference. For over 180 years, we have been training engineers who make an impact worldwide in companies, government bodies, or as entrepreneurs. Our alumni turn knowledge into concrete solutions for the challenges of today and tomorrow. These challenges are changing rapidly. That is why we focus on themes such as energy, climate, digitalisation, artificial intelligence (AI), and smart mobility every day. Our education and research are directly aligned with what society needs now and in the future. At TU Delft, our people make the difference. With their knowledge and curiosity, our staff provide a high-quality education and conduct pioneering research that extends beyond the campus. You will have the opportunity to take the initiative, work with others, and grow as a professional. Working at TU Delft means join an international community of professionals and students. Together, we create knowledge, innovations, and solutions that help move the world forward.

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