Fig. 4: Comparison of optical losses with different material platforms on a chip.
From: A mid-infrared Brillouin laser using ultra-high-Q on-chip resonators
The propagation losses of diverse mid-IR on-chip resonators and waveguides are compared with this work. Different markers indicate different material platforms: chalcogenide glasses (black, circle), silicon nitride (brown, diamond), silicon (blue, triangle), germanium (purple, square), III−V semiconductors (orange, hexagram), and SiGe (green, reversed triangle). The solid symbols represent resonators, and the open symbols indicate waveguides. The optical losses of this work are converted from the record Q-factors shown as the red line in Fig. 3a. The loss of state-of-the-art As2Se3 fiber fabricated using identical source materials in this work is drawn as a grey line. All references are given in Supplement 8.
