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Proceedings Paper

Precision glass molding of high-resolution diffractive optical elements
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Paper Abstract

The demand of high resolution diffractive optical elements (DOE) is growing. Smaller critical dimensions allow higher deflection angles and can fulfill more demanding requirements, which can only be met by using electron-beam lithography. Replication techniques are more economical, since the high cost of the master can be distributed among a larger number of replicas. The lack of a suitable mold material for precision glass molding has so far prevented an industrial use. Glassy Carbon (GC) offers a high mechanical strength and high thermal strength. No anti-adhesion coatings are required in molding processes. This is clearly an advantage for high resolution, high aspect ratio microstructures, where a coating with a thickness between 10 nm and 200 nm would cause a noticeable rounding of the features. Electron-beam lithography was used to fabricate GC molds with highest precision and feature sizes from 250 nm to 2 μm. The master stamps were used for precision glass molding of a low Tg glass L-BAL42 from OHARA. The profile of the replicated glass is compared to the mold with the help of SEM images. This allows discussion of the max. aspect-ratio and min. feature size. To characterize optical performances, beamsplitting elements are fabricated and their characteristics were investigated, which are in excellent agreement to theory.

Paper Details

Date Published: 27 April 2016
PDF: 8 pages
Proc. SPIE 9888, Micro-Optics 2016, 98880U (27 April 2016); doi: 10.1117/12.2228873
Show Author Affiliations
Karin Prater, Ecole Polytechnique Fédérale de Lausanne (Switzerland)
Julia Dukwen, Fraunhofer-Institut für Produktionstechnologie IPT (Germany)
Toralf Scharf, Ecole Polytechnique Fédérale de Lausanne (Switzerland)
Hans Peter Herzig, Ecole Polytechnique Fédérale de Lausanne (Switzerland)
Sven Plöger, HOLOEYE Photonics AG (Germany)
Andreas Hermerschmidt, HOLOEYE Photonics AG (Germany)


Published in SPIE Proceedings Vol. 9888:
Micro-Optics 2016
Hugo Thienpont; Jürgen Mohr; Hans Zappe; Hirochika Nakajima, Editor(s)

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