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A novel approach to tunable diffractive transmission gratings based on dielectric elastomer actuators

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


Bar-Cohen, Y. (Hrsg.) ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Electroactive polymer acuators and devices (EAPAD) 2010 : 8 - 11 March 2010, San Diego, California, United States
Bellingham, WA: SPIE, 2010 (Proceedings of SPIE 7642)
ISBN: 978-0-8194-8056-9
Paper 76422Y
Electroactive Polymers Actuators and Devices (EAPAD) Conference <2010, San Francisco/Calif.>
Conference Paper
Fraunhofer IAP ()

Dielectric elastomer actuators (DEA) of poly-styrene-ethylene-butadiene-styrene (SEBS) and commonly used VHB4910 tape were studied for voltage tunable optical transmission gratings. A new geometry is proposed, in which the grating is placed in an area without electrodes, permitting for light transmission through the device. Experiments were performed to implement surface relief gratings on DEA films from pattern masters made from holographic recorded gratings. Since the actuation strain of the DEA depends strongly on the boundary conditions, the desired voltage-controllable deformation of the grating can be achieved by choosing suitable manufacturing parameters. Conditions were found permitting a shift of up to 9 % in a 1 ?m grating. A model based on independently measured material parameters is shown to describe the optical behavior.