Journal
COMMUNICATIONS MATERIALS
Volume 1, Issue 1, Pages -Publisher
SPRINGERNATURE
DOI: 10.1038/s43246-019-0003-8
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Funding
- European Research Council (ERC) under the European Union's Horizon 2020 [639107 - INsPIRE]
- Conseil General de l'Essonne
- French RENATECH network
- TEINVEIN project - POR FESR 2014-2020 [242092]
- European Union Horizon 2020 FET project microSPIRE [766955]
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Waveguide integrated optical modulators in the mid-infrared wavelength range are of significant interest for molecular spectroscopy. This is because on-chip synchronous detection can improve the performance of detection systems and can also be used for free-space communications where optical modulators working in atmospheric transparency windows are needed. Here we report optical modulation in a mid-infrared photonic circuit, reaching wavelengths larger than 8 mu m. Optical modulation in the wavelength range from 5.5 to 11 mu m is shown, relying on a broadband Ge-rich graded-SiGe platform. This demonstration experimentally confirms the free-carrier absorption effect modeling. These results pave the way towards efficient high-performance electrically-driven integrated optical modulators in the mid-infrared wavelength range. Mid-infrared optical modulators are important for detecting compounds in a wide range of applications, but are typically limited to short wavelengths. Now, a SiGe waveguide is used to fabricate an optical modulator that can reach wavelengths spanning 5.5 mu m to 11 mu m.
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