期刊
ACS PHOTONICS
卷 7, 期 12, 页码 5423-5429出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.0c01232
关键词
supercontinuum; mid-infrared; nonlinear; integrated circuits; silicon; germanium
类别
资金
- European Research Council (ERC) under the European Union's Horizon-2020 research and innovation program [639107-InsPIRE]
- EU Horizon-2020 FET microSPIRE Project [766955]
- Conseil Ge'ne'ral de l'Essonne
- French RENATECH network
Midinfrared spectroscopy is a universal way to identify chemical and biological substances. Indeed, when interacting with a light beam, most molecules are responsible for absorption at specific wavelengths in the mid-IR spectrum, allowing to detect and quantify small traces of substances. On-chip broadband light sources in the midinfrared are thus of significant interest for compact sensing devices. In that regard, supercontinuum generation offers a mean to efficiently perform coherent light conversion over an ultrawide spectral range, in a single and compact device. This work reports the experimental demonstration of on-chip two-octave supercontinuum generation in the mid-infrared wavelength, ranging from 3 to 13 mu m (that is larger than 2500 cm(-1)) and covering almost the full transparency window of germanium. Such an ultrawide spectrum is achieved thanks to the unique features of Ge-rich graded SiGe waveguides, which allow second-order dispersion tailoring and low propagation losses over a wide wavelength range. The influence of the pump wavelength and power on the supercontinuum spectra has been studied. A good agreement between the numerical simulations and the experimental results is reported. Furthermore, a very high coherence is predicted in the entire spectrum. These results pave the way for wideband, coherent, and compact mid-infrared light sources by using a single device and compatible with large-scale fabrication processes.
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