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19 February 2014 High-refractive-index gratings for spectroscopic and laser applications
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Proceedings Volume 8995, High Contrast Metastructures III; 899504 (2014)
Event: SPIE OPTO, 2014, San Francisco, California, United States
Fabrication of high performance gratings may significantly benefit from the use of high index materials such as Ta2O5, TiO 2 or Al2O3. However, these materials can typically not be patterned with the required quality by common etching processes. To overcome this limitation we developed novel grating fabrication technologies based on a combination of conventional lithography with Atomic-Layer-Deposition. For that the basic structure of the grating is first realized in a fused-silica substrate or a SiO2-layer. This template is then functionalized by an ALD-coating in a specific pre-defined manner. The new approach opens up a huge variety of new options for the realization of gratings whose fabrication would otherwise not be possible.
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Uwe D. Zeitner, Frank Fuchs, E.-Bernhard Kley, and Andreas Tünnermann "High-refractive-index gratings for spectroscopic and laser applications", Proc. SPIE 8995, High Contrast Metastructures III, 899504 (19 February 2014);

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