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  4. Encapsulation process for diffraction gratings
 
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2015
Journal Article
Title

Encapsulation process for diffraction gratings

Abstract
Encapsulation of grating structures facilitates an improvement of the optical functionality and/or adds mechanical stability to the fragile structure. Here, we introduce novel encapsulation process of nanoscale patterns based on atomic layer deposition and micro structuring. The overall size of the encapsulated structured surface area is only restricted by the size of the available microstructuring and coating devices; thus, overcoming inherent limitations of existing bonding processes concerning cleanliness, roughness, and curvature of the components. Finally, the process is demonstrated for a transmission grating. The encapsulated grating has 97.5% transmission efficiency in the -1st diffraction order for TM-polarized light, and is being limited by the experimental grating parameters as confirmed by rigorous coupled wave analysis.
Author(s)
Ratzsch, Stephan
Kley, Ernst-Bernhard  
Tünnermann, Andreas  
Szeghalmi, Adriana  
Journal
Optics Express  
Open Access
Link
Link
DOI
10.1364/OE.23.017955
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