Mid-infrared octave spanning supercontinuum generation to 8.5 μm in silicon-germanium waveguides

By M. Sinobad, Christelle Monat, B. Luther-Davies, P. Ma, S. Madden, David J. Moss, Arnan Mitchell, D. Allioux, R. Orobtchouk, S. Boutami and 3 more. 2018

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Efficient on-chip molecule and bio-agent detection can be achieved by accessing strong molecular absorption lines in the mid-infrared, but it requires high output power broadband mid-IR sources. Here, we report supercontinuum generation in an air-clad Si0.6Ge0.4/Si waveguide that emits a broad spectrum spanning from 3.0 μm to 8.5 μm. These waveguides have anomalous dispersion and low propagation loss (<0.4  dB/cm) in the mid-IR, which leads to a supercontinuum output with a high average power of more than 10 mW on-chip. The realization of broadband mid-IR sources with high spectral brightness makes the SiGe-on-Si platform promising for a wide range of applications.

Subfields: Atomic and Molecular Physics, and Optics, Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/29685c2a3a1208ce54aa3dc090dcd64577ee4e65