DOI: 10.1063/5.0242398 ISSN: 0003-6951
Single mode, distributed feedback interband cascade lasers grown on Si for gas sensing
Daniel Andrés Díaz-Thomas, Diba Ayache, Maëva Fagot, Zeineb Loghmari, Audrey Gilbert, Yves Rouillard, Alexei N. Baranov, Jean-Baptiste Rodriguez, Eric Tournié, Aurore Vicet, Laurent CeruttiA single mode distributed feedback (DFB) interband cascade laser (ICL) grown on a (001) Si substrate has been developed. The designed DFB ICL with a grating on top of the ridge emits at a wavelength near 3.4 μm, suited for methane gas sensing, and operates in continuous wave up to 35 °C, with a maximum output power of 4 mW/facet at 15 °C and a side mode suppression ratio of 20 dB in the whole operating range. Methane detection has been demonstrated by integrating the DFB ICL on Si with a quartz-enhanced photoacoustic spectroscopy setup, a step forward in the development of integrated photonic gas sensors on silicon platforms.