Mr. Christoph Wenisch Profile

Christoph Wenisch

at Friedrich-Schiller-Univ Jena

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Proceedings Article | 2 March 2020 Presentation + Paper

Sub-diffraction direct laser writing by a combination of STED and ESA

S. Engel, C. Wenisch, S. Gräf, F. Müller

Proceedings Volume 11268, 112680D (2020) https://doi.org/10.1117/12.2542527

KEYWORDS: Stimulated emission depletion microscopy, Absorption, Luminescence, Laser ablation, Multiphoton lithography, Optical properties, Zinc oxide, Laser processing

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We introduce a novel sub-diffraction direct laser writing process and discuss its advantages compared to common lithographic methods. The fundamental idea is based on the combination of a Stimulated Emission Depletion (STED) with the effect of an Excited State Absorption (ESA). Analogous to the STED-microscopy, an excited spatial volume below the diffraction limit is created. The modified optical properties of this volume compared to the non-excited surrounding regions are used for the subsequent spatially restricted processing based on an ESA. In combination with a required STED- and ESA-compatibility, a variety of potentially suitable processes for excitation, stimulated emission, and ESA are presented for various materials. Here, direct semiconductors such as ZnO are of particular interest for a STED-process. The second essential requirement, an ESA-based processing, was demonstrated experimentally for the first time at a 200 nm thinn ZnO-layer sputtered on a fused silica substrate. For this purpose, an experimental setup consisting of two ns-lasers, one for excitation and one for the ESA-based processing, as well as a variable time delay, was used.

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