Single-Crystal Germanium Core Optoelectronic Fibers

Synthesis and fabrication of high-quality, small-core single-crystal germanium fibers that are photosensitive at the near-infrared and have low optical losses approximate to 1 dB cm(-1) at 2 mu m are reported. These fibers have potential applications in fiber-based spectroscopic imaging, nonlinear optical devices, and photo-detection at the telecommunication wavelengths.