Refractive index measurements of photo-resists for three-dimensional direct laser writing
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TLDR
In this paper, the authors characterize 5 photoresists that are used with femtosecond 3D direct laser writers, namely IP-S, IP-Dip, IPL, IPG, and OrmoComp with a modified and automized Pulfrich refractometer setup, utilizing critical angles of total internal reflection.Abstract:
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. Here, we characterize 5 photoresists that are used with femtosecond 3D direct laser writers, namely IP-S, IP-Dip, IP-L, IP-G, and OrmoComp with a modified and automized Pulfrich refractometer setup, utilizing critical angles of total internal reflection. We achieve an accuracy of 5⋅10−4 and reference our values to a BK-7 glass plate. We also give Abbe numbers and Schott Catalog numbers of the different resists. Their refractive indices are in the 1.49-1.57 range, while their Abbe numbers are in the range between 35 and 51.read more
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References
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Two-photon direct laser writing of ultracompact multi-lens objectives
TL;DR: Femtosecond two-photon direct laser writing was used to create 100µm-scale high-performance multi-lens objectives in this paper, where the authors used a two-phase direct laser writer.
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Three-dimensional optical laser lithography beyond the diffraction limit
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Photonic metamaterials by direct laser writing and silver chemical vapor deposition
TL;DR: In this article, planar magnetic photonic metamaterials were fabricated via direct laser writing and silver chemical vapor deposition, an approach which is also suitable for three-dimensional structures, revealing the importance of bi-anisotropy.
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3D-printed eagle eye: Compound microlens system for foveated imaging.
TL;DR: This work presents a highly miniaturized camera, mimicking the natural vision of predators, by 3D-printing different multilens objectives directly onto a complementary metal-oxide semiconductor (CMOS) image sensor.