An integrated, crystalline organic waveguide-coupled InGaAs photodetector

We describe a novel, integrated organic-inorganic waveguide/photodetector with an internal quantum efficiency of (53/spl plusmn/15%). Low-loss (2.7/spl plusmn/0.3 dB/cm at /spl lambda/=1.064 μm for 10-μm wide waveguides) crystalline organic waveguides are grown directly onto the pre-processed InGaAs photodetector by organic molecular beam deposition (OMBD) without affecting either the dark current or capacitance of the photodiode. The polarization-preserving nature of the waveguides suggests that a patterned substrate significantly influences the organic molecular orientation during vacuum deposition.