In the recently published paper “3D micro-devices for enhancing the lateral resolution in optical microscopy”, scientists from various institutions, including Ruhr University Bochum, have developed a new strategy for the production of high-quality micro-spheres using laser-based 3D printing. This approach uses multiphoton lithography, which enables the maskless production of real 3D structures in the micro and nano range. The integration of dielectric microspheres behind the imaging lens of an optical microscope offers a promising solution to improve lateral resolution.

Ultrashort laser pulses are used to generate laser-induced periodic surface structures (LIPSS). To generate LIPSS on small, confined surfaces, the laser source must be focused to a small spot diameter. In contrast to the commonly used high numerical aperture objectives, we present a Bessel beam based approach to generate LIPSS covered lines. The setup convinces with a large depth of field. The applicability of this method is demonstrated by patterning the cladding surface of nickel-titanium wires.
The work is presented on the cover of the journal Applied Physics A.

Anton Saetchnikov presented the results of his thesis on 12.10.2022, and successfully passed the final examination. The title of his thesis is: Intelligent optical biosensing with multiplexed microresonator imaging