Erlangen 2018 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 13: Laser Development and Applications (joint session Q/A)
Q 13.6: Talk
Monday, March 5, 2018, 15:15–15:30, K 0.023
Systematic refractive index measurements of photo-resists for three-dimensional direct laser writing — •Michael Schmid and Harald Giessen — 4th Physics Institute and Research Center SCoPE, University of Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany
Femtosecond 3D printing is an important technology for manufacturing of nano- and microscopic devices and elements. Crucial for the design of such structures is the detailed knowledge of the refractive index in the visible and near-infrared spectral range and its dispersion.
We characterize different photoresists that are used with femtosecond 3D direct laser writers, namely IP-S, IP-Dip, IP-L, and OrmoComp with a modified and automized Pulfrich refractometer setup, utilizing critical angles of total internal reflection. Thereby we achieve an accuracy of 5·10−4 and reference our values to a BK-7 glass plate. Their refractive indices are in the 1.49-1.57 range, while their Abbe numbers are in the range between 35 and 51.
Furthermore, we systematically study the effects of UV exposure duration as well as the aging process on the refractive index of the photo resists which are crucial for 3D printed functional devices, especially nano- and microscopic devices. We also deliver the first measurements of refractive index of actual 3D printed samples.