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Voltage-controlled compression for period tuning of optical surface relief gratings

 
: Kollosche, M.; Döring, S.; Stumpe, J.; Kofod, G.

:

Optics Letters 36 (2011), No.8, pp.1389-1391
ISSN: 0146-9592
English
Journal Article
Fraunhofer IAP ()

Abstract
This Letter reports on new methods and a consistent model for voltage tunable optical transmission gratings. Elas-tomeric gratings were molded from holographically written surface relief gratings in an azobenzene sol-gel material. These were placed on top of a transparent electroactive elastomeric substrate. Two different electro-active substrate elastomers were employed, with a large range of prestretches. A novel finite-deformation theory was found to match the device response excellently, without fitting parameters. The results clearly show that the grating underwent pure-shear deformation, and more surprisingly, that the mechanical properties of the electro-active substrate did not affect device actuation.

: http://publica.fraunhofer.de/documents/N-170043.html