Freiburg 2024 – scientific programme

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SYAS: Awards Symposium

SYAS 1: Award Symposium

SYAS 1.4: Prize Talk

Tuesday, March 12, 2024, 16:30–17:00, Paulussaal

3D printed complex microoptics: fundamentals and first benchmark applications — •Harald Giessen — 4. Physikalisches Institut, Universität Stuttgart — Laureate of the Robert-Wichard-Pohl-Prize 2024

We introduce 3d printed complex microoptics, spanning a range between a few micrometers up to 5 mm. Our lens system consist of aspherical multiplet lens systems which can give high numerical apertures with simultaneously excellent imaginag properties over the entire field of view, even directly on an optical fiber tip. Combining several printed materials with different refractive indices and dispersions and the combination with diffractive elements allows for realization of micro-optical achromats or even apochromats which are aplanatic (no first- and third-order aberrations such as spherical aberration, astigmatism, coma, distortion etc.) and achromatic for 3 wavelengths (red, green, blue). We also demonstrate the direct printing of black resists, which results in aperture stops and blackened hulls. Atomic layer deposition yields antireflection coatings on all optical elements. Confocal surface profiling and wavefront interferometry demonstrate accuracies far better than lambda/20. In combination with high-resolution nanostructuring, also 3D holograms and metasurfaces can be included. We utilize these methods to demonstrate the smallest endoscope in the world, passing through a root canal of a tooth, as well as ultracompact sensors. Coupling single quantum emitters or single photon detectors to single mode fibers is demonstrated. Furthermore, single-fiber optical trapping of live cells or atomic systems becomes possible.

Keywords: 3D printing; microoptics; metasurfaces; holography; optical materials