Mid-infrared Integrated Electro-optic Modulator Operating up to 225 MHz between 6.4 and 10.7 mu m Wavelength

Mid-infrared spectroscopy is essential for identifying molecular species, while related electro-optic modulators are crucial for signal-to-noise enhancement via synchronous detection. Therefore, the development of integrated modulators is expected to have a major impact in compact and widespread sensing applications. In this work, we experimentally demonstrate a broadband integrated electro-optic modulator, based on a graded-index SiGe photonics platform and free-carrier plasma dispersion effect. Optical modulation is reported from 6.4 to 10.7 mu m wavelength, showing an operational frequency up to 225 MHz. These results pave the way for the development of multimolecule on-chip spectroscopic systems, operating at the longest mid-infrared wavelengths.

Automated summary

The research team has achieved a broadband integrated electro-optic modulator based on the SiGe photonics platform and the free-carrier plasma dispersion effect, capable of optical modulation in the range of 6.4 to 10.7 micrometers, with an operational frequency up to 225 MHz.