Mainz 2026 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 77: Photonics – 3D Printing

Q 77.2: Vortrag

Freitag, 6. März 2026, 14:45–15:00, P 2

Compact 3D-printed dark-field condenser for high-resolution optical microscopy — •Robert Horvat¹, Leander Siegle¹, Luca Schmid¹, Pavel Ruchka², Philipp Flad¹, Monika Ubl¹, Michael Schmid², Lukas Wesemann^3,4, and Harald Giessen¹ — ¹4th Physics Institute and Research Center SCoPE, University of Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany — ²Printoptix GmbH, Nobelstraße 15, 70569 Stuttgart, Germany — ³School of Physics, The University of Melbourne, Victoria 3010, Australia — ⁴ARC Centre of Excellence for Transformative Meta-Optical Systems, School of Physics, The University of Melbourne, Victoria 3010, Australia

We present a miniaturized, millimeter-scale dark-field condenser fabricated using femtosecond two-photon polymerization 3D printing. The device combines an annular absorbing aperture and a high numerical aperture lens on opposite sides of a glass substrate to enable oblique illumination for dark-field imaging. This compact condenser achieves strong contrast enhancement without bulky optics. We demonstrate its performance on USAF 1951 resolution targets, biological samples, and gold nanodisks below 300 nm, which remain invisible under collimated illumination. Our results pave the way for fully 3D-printed, cost-effective dark-field microscopy systems for applications in biology, medicine, and lab-on-chip devices.

Keywords: Two-photon polymerization; Microscopy; Micro-optics