On-Chip Mid-Infrared Supercontinuum Generation from 3 to 13 μm Wavelength

• DOI: 10.1021/acsphotonics.0c01232
• Publication Date: 2020-11-11T19:54:05Z
• Authors: Miguel Montesinos...; Christian Lafforgue; Jacopo Frigerio; Andrea Ballabio; Vladyslav Vakarin; Qiankun Liu; Joan Manel Ramirez; Xavier Le Roux; David Bouville; Andrea Barzaghi; Carlos Alonso-Ramos; Laurent Vivien; Giovanni Isella; Delphine Marris-M...
• Keywords: Supercontinuum

Midinfrared spectroscopy is a universal way to identify chemical and biological substances. Indeed, when interacting with light beam, most molecules are responsible for absorption at specific wavelengths in the mid-IR spectrum, allowing detect quantify small traces of On-chip broadband sources mid-infrared thus significant interest compact sensing devices. In that regard, supercontinuum generation offers mean efficiently perform coherent conversion over an ultrawide spectral range, single device. This work reports experimental demonstration on-chip two-octave wavelength, ranging from 3 13 μm (that larger than 2500 cm–1) covering almost full transparency window germanium. Such spectrum achieved thanks unique features Ge-rich graded SiGe waveguides, which allow second-order dispersion tailoring low propagation losses wide wavelength range. The influence pump power on spectra has been studied. A good agreement between numerical simulations results reported. Furthermore, very high coherence predicted entire spectrum. These pave wideband, coherent, by using device compatible large-scale fabrication processes.