Low-loss germanium strip waveguides on silicon for the mid-infrared

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.


Published in:
Optics Letters, 37, 14, 2883-2886
Year:
2012
Publisher:
Washington, Optical Society of America
ISSN:
0146-9592
Keywords:
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 Record created 2012-08-30, last modified 2018-03-17

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