Produção Nacional
Revisado por pares
Infrared frequency comb generation and spectroscopy with suspended silicon nanophotonic waveguides
2019; Optica Publishing Group; Volume: 6; Issue: 10 Linguagem: Inglês
10.1364/optica.6.001269
ISSN2334-2536
AutoresNima Nader, Abijith S. Kowligy, Jeff Chiles, Eric J. Stanton, Henry Timmers, Alexander J. Lind, Flávio C. Cruz, Daniel Lesko, Kimberly A. Briggman, Sae Woo Nam, Scott A. Diddams, Richard P. Mirin,
Tópico(s)Spectroscopy and Laser Applications
ResumoNanophotonic waveguides with sub-wavelength mode confinement and engineered dispersion profiles are an excellent platform for application-tailored nonlinear optical interactions at low pulse energies.Here, we present fully air clad suspended-silicon waveguides for infrared frequency comb generation with optical bandwidth limited only by the silicon transparency.The achieved spectra are lithographically tailored to span 2.1 octaves in the mid-infrared (2.0-8.5 µm or 1170-5000 cm -1 ) when pumped at 3.10 µm with 100 pJ pulses.Novel fork-shaped couplers provide efficient input coupling with only 1.5 dB loss.The coherence, brightness, and the stability of the generated light are highlighted in a dual frequency comb setup in which individual comb-lines are resolved with 30 dB extinction ratio and 100 MHz spacing in the wavelength range of 4.8-8.5 µm (2100-1170 cm -1 ).These sources are used for broadband gas-and liquid-phase dual-comb spectroscopy with 100 MHz comb-line resolution.We achieve a peak spectral signal-to-noise ratio of 10 √ Hz across a simultaneous bandwidth containing 112,200 comb-lines.These results provide a pathway to further integration with the developing high repetition rate frequency comb lasers for compact sensors with applications in chip-based chemical analysis and spectroscopy.
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