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<p>Seamlessly integrating stimulated Brillouin scattering (SBS) in a low-loss and mature photonic integration platform remains a complicated task. Virtually all current approaches fall short in simultaneously achieving strong SBS, low losses and technological scalability. Here we incorporate strong SBS into a standard silicon nitride platform by the simple deposition of a tellurium oxide layer, a commonly used material in acousto-optic modulators. In these heterogeneously integrated waveguides, we harness SBS interactions actuated by surface acoustic waves leading to more than two-orders-of-magnitude gain enhancement. Three applications of this platform are demonstrated: (1) a silicon-nitride-based Brillouin amplifier with 5-dB net optical gain, (2) a compact intermodal stimulated Brillouin laser capable of high-purity radio-frequency signal generation with a 7-Hz intrinsic linewidth and (3) a widely tunable microwave photonic notch filter with an ultranarrow linewidth of 2.2 MHz enabled by Brillouin-induced opacity. These advancements can unlock an array of new radio-frequency and optical technologies to be directly integrated in silicon nitride.</p>

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Surface acoustic wave Brillouin photonics on a silicon nitride chip

  • 期刊论文

  • 发表日期：

    2026年3月19日

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  • Yvan Klaver,
  • Randy te Morsche,
  • Roel A. Botter,
  • Batoul Hashemi,
  • Bruno L. Segat Frare,
  • Akhileshwar Mishra,
  • Kaixuan Ye,
  • Hamidu M. Mbonde,
  • Pooya Torab Ahmadi,
  • Niloofar Majidian Taleghani,
  • Evan Jonker,
  • Redlef B. G. Braamhaar,
  • Ponnambalam Ravi Selvaganapathy,
  • Peter Mascher,
  • Peter J. M. van der Slot,
  • Jonathan D. B. Bradley,
  • David Marpaung

摘要

Seamlessly integrating stimulated Brillouin scattering (SBS) in a low-loss and mature photonic integration platform remains a complicated task. Virtually all current approaches fall short in simultaneously achieving strong SBS, low losses and technological scalability. Here we incorporate strong SBS into a standard silicon nitride platform by the simple deposition of a tellurium oxide layer, a commonly used material in acousto-optic modulators. In these heterogeneously integrated waveguides, we harness SBS interactions actuated by surface acoustic waves leading to more than two-orders-of-magnitude gain enhancement. Three applications of this platform are demonstrated: (1) a silicon-nitride-based Brillouin amplifier with 5-dB net optical gain, (2) a compact intermodal stimulated Brillouin laser capable of high-purity radio-frequency signal generation with a 7-Hz intrinsic linewidth and (3) a widely tunable microwave photonic notch filter with an ultranarrow linewidth of 2.2 MHz enabled by Brillouin-induced opacity. These advancements can unlock an array of new radio-frequency and optical technologies to be directly integrated in silicon nitride.