Graphene Photodetector Enhanced by a Planar Yagi-Uda Antenna

This study focuses on enhancing light absorption in graphene devices and the resulting responsivity of graphene photodetectors using a planar Yagi-Uda antenna configuration. Simulations and experimental data show enhanced absorption in the wavelength range between 520 nm and 450 nm targeted for this proof-of-principle. We achieved a responsivity of 0.9 mA/W at a laser output power of 9.0 mW. The antenna concept can be applied to any thin active medium.