This 3-sentence PR summary is almost contentless, however the linked published paper is fascinating. Recommend updating the link!

https://www.science.org/doi/10.1126/sciadv.abq2196

> …we unlock acoustic waveguiding in this platform, potentially leading up to 15× higher Brillouin gain coefficient than previously possible in Si3N4 waveguides. We use the enhanced SBS gain to demonstrate a high-rejection microwave photonic notch filter. This demonstration opens a path to achieving Brillouin-based photonic circuits…