Guided-acoustic stimulated Brillouin scattering in silicon nitride photonic circuits

Roel Botter, Kaixuan Ye, Yvan Klaver, Radius Suryadharma, Okky Daulay, Gaojian Liu, Jasper van den Hoogen, Lou Kanger, Peter van der Slot, Edwin J. Klein, Marcel Hoekman, Chris G.H. Roeloffzen, Yang Liu, David Marpaung*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

23 Citations (Scopus)
77 Downloads (Pure)

Abstract

Coherent optomechanical interaction known as stimulated Brillouin scattering (SBS) can enable ultrahigh resolution signal processing and narrow-linewidth lasers. SBS has recently been studied extensively in integrated waveguides; however, many implementations rely on complicated fabrication schemes. The absence of SBS in standard and mature fabrication platforms prevents its large-scale circuit integration. Notably, SBS in the emerging silicon nitride (Si3N4) photonic integration platform is currently out of reach because of the lack of acoustic guidance. Here, we demonstrate advanced control of backward SBS in multilayer Si3N4 waveguides. By optimizing the separation between two Si3N4 layers, 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 in a standard, low-loss Si3N4 platform.
Original languageEnglish
Article numberabq2196
Number of pages6
JournalScience advances
Volume8
Issue number40
DOIs
Publication statusPublished - 7 Oct 2022

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