Electrode design of velocity matched photodetector with cascaded resonant structure operating at millimeter-wave range

This paper presents an electrode design of a new photodetector operating in the millimeter-wave range. By taking advantage of narrow band operation, the proposed photodetector is designed to have a cascaded resonant structure and a reflector to achieve high RF output. The resonator and reflector are realized by using one-fourth wavelength shorted stubs and an open stub of a coplanar waveguide, respectively. Velocity matching between optical waves and detected millimeter wave signals are performed by introducing an S-shaped meandering transmission line for the photocurrents