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Nanophotonic waveguides with sub-wavelength mode confinement and engineereddispersion profiles are an excellent platform for application-tailorednonlinear optical interactions at low pulse energies. Here, we present fullyair clad suspended-silicon waveguides for infrared frequency comb generationwith optical bandwidth limited only by the silicon transparency. The achievedspectra are lithographically tailored to span 2.1 octaves in the mid-infrared(2.0-8.5 um or 1170--5000 cm-1) when pumped at 3.10 um with 100 pJ pulses.Novel fork-shaped couplers provide efficient input coupling with only 1.5 dBloss. The coherence, brightness, and the stability of the generated light arehighlighted in a dual frequency comb setup in which individual comb-lines areresolved with 30 dB extinction ratio and 100 MHz spacing in the wavelengthrange of 4.8-8.5 um (2100-1170 cm-1). These sources are used for broadband gas-and liquid-phase dual-comb spectroscopy with 100 MHz comb-line resolution. Weachieve a peak spectral signal-to-noise ratio of 10 Hz^0.5 across asimultaneous bandwidth containing 112,200 comb-lines. These results provide apathway to further integration with the developing high repetition ratefrequency comb lasers for compact sensors with applications in chip-basedchemical analysis and spectroscopy.

Nonlinear silicon waveguides generating broadband, spectrally engineered frequency combs spanning 2.0-8.5 um