Mid-infrared photonics in silicon and germanium

Ingenious techniques are needed to extend group IV photonics from near-infrared to mid-infrared wavelengths. If achieved, the reward could be on-chip CMOS optoelectronic systems for use in spectroscopy, chemical and biological sensing, and free-space communications.

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Figure 1: Infrared wavelength range over which waveguide propagation loss is less than 2 dB cm−1.
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Soref, R. Mid-infrared photonics in silicon and germanium. Nature Photon 4, 495–497 (2010). https://doi.org/10.1038/nphoton.2010.171

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