Figure 1(b) shows the top view of t

Figure 1(b) shows the top view of the layout as well as a micrograph of a structure fabricated as outlined in section 4. The light is coupled from an external light source into the polymer access waveguide and guided to the integrated GP-EAM with a cross section as shown in Fig. 1(a). In the GP-EAM section the light propagates in the waveguide parallel to the graphene layers. In this waveguide-integrated approach the interaction length between light and graphene can be increased significantly compared to a perpendicular light transition through a graphene layer, which would yield a relatively low absorption of