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  • Title: Low-loss germanium strip waveguides on silicon for the mid-infrared.
    Author: Chang YC, Paeder V, Hvozdara L, Hartmann JM, Herzig HP.
    Journal: Opt Lett; 2012 Jul 15; 37(14):2883-5. PubMed ID: 22825166.
    Abstract:
    Mid-infrared photonics in silicon needs low-loss integrated waveguides. While monocrystalline germanium waveguides on silicon have been proposed, experimental realization has not been reported. Here we demonstrate a germanium strip waveguide on a silicon substrate. It is designed for single mode transmission of light in transverse magnetic (TM) polarization generated from quantum cascade lasers at a wavelength of 5.8 μm. The propagation losses were measured with the Fabry-Perot resonance method. The lowest achieved propagation loss is 2.5 dB/cm, while the bending loss is measured to be 0.12 dB for a 90° bend with a radius of 115 μm.
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