Defence of Thesis 9 October 2026: Enkui Lian – Faculty of Natural Sciences

Doctoral Candidate Enkui Lian at the Department of Chemistry and Biomedical Science will hold a trial lecture and defend his doctoral thesis for the degree of Philosophiae Doctor (PhD). The degree is administered by the Faculty of Natural Sciences at the Norwegian University of Science and Technology (NTNU). Thesis title Scalable Nanostructure Fabrication and Polarisation-Resolved Optical Metrology Trial lecture Assigned topic: Principles and applications of two photon polymerisation additive manufacturing and routes towards industrial scalability Assessment Committee The Faculty of Natural Sciences has appointed the following members to the assessment committee for the evaluation of the thesis: First opponent : Dr. Philip Shields, University of Bath, United Kingdom Second opponent : Dr. Akhil Kallepalli, University of Strathclyde, United Kingdom Chair of the committee : Professor Astrid Aksnes, Department of Electronic Systems, NTNU The committee has concluded that the thesis is worthy of public defense for the PhD degree. Supervisors Main supervisor : Professor John de Mello, Department of Chemistry and Biomedical Science, NTNU Co-supervisor : Professor Henrik Koch, Department of Chemistry and Biomedical Science, NTNU Time and venue The PhD trial lecture and defence of the thesis are open to the public: Trial lecture: 9 October 2026 at 10:15 – Onsager, the Science Building, Gløshaugen, NTNU Defence of the thesis: 9 October 2026 at 13:15 – Onsager, the Science Building, Gløshaugen, NTNU You may also follow the entire event, including the trial lecture and defence, online via Microsoft Teams: Thesis summary Many advances in nanophotonics depend on precise fabrication and optical measurements, but the equipment and workflows can be costly and difficult to reproduce. This thesis presents four studies exploring practical, more accessible approaches to both challenges. The first part develops a streamlined method using laser interference to make periodic patterns across centimetre-scale areas, with pattern spacing and orientation controlled by the optical setup. It also investigates a route to dense arrays of tiny metal gaps, using molecular spacers to control the gap width. These structures can concentrate light in very small regions. The second part develops a compact rotation mount for optical components using hollow-shaft motors built from printed-circuit-boards (PCB) motor and angle-sensor feedback. The mount enables accurate positioning and smooth rotation. Building on this platform, a chemical polarimetry method measures small changes in light’s polarisation by relating the detected signal to the measured rotation angle. It achieves millidegree-level resolution. Together, the studies show how accessible fabrication methods and compact instruments can support reproducible nanostructure production and sensitive optical measurements.

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