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Efficient focusing polymer waveguide grating couplers

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4 Author(s)
Waldausl, R. ; Fraunhofer-Inst. for Appl. Opt. & Precision Eng., Jena ; Schnabel, B. ; Kley, E.-B. ; Brauer, A.

Investigations on focusing grating couplers fabricated in polymer waveguides by electron beam lithography are reported. With blazed gratings, an incoupling efficiency of 42% is achieved. A curvature correction of the grating lines allows the focusing properties to be improved: a spotsize which corresponds to one and a half times the diffraction limit is achieved

Published in:

Electronics Letters  (Volume:33 ,  Issue: 7 )