Electrically-driven Acousto-optics and Broadband Non-reciprocity in Silicon Photonics

Abstract

Emerging technologies based on tailorable interactions between photons and phonons promise new capabilities ranging from high-fidelity microwave signal processing to non-reciprocal optics and quantum state control. While such light-sound couplings have been studied in a variety of physical systems, many implementations rely on non-standard materials and fabrication schemes that are challenging to co-implement with standard integrated photonic circuitry. Notably, despite significant advances in integrated electro-optic modulators, related acousto-optic modulator concepts have remained relatively unexplored in silicon photonics. In this article, we demonstrate direct acousto-optic modulation within silicon waveguides using electrically-driven surface acoustic waves (SAWs). By co-integrating SAW transducers in piezoelectric AlN with a standard silicon-on-insulator photonic platform, we harness silicon's strong elasto-optic effect to mediate linear light-sound coupling. Through lithographic design, acousto-optic phase and single-sideband amplitude modulators in the range of 1-5 GHz are fabricated, exhibiting index modulation strengths comparable to existing electro-optic technologies. Extending this traveling-wave, acousto-optic interaction to cm-scales, we create electrically-driven non-reciprocal modulators in silicon. Non-reciprocal operation bandwidths of >100 GHz and insertion losses <0.6 dB are achieved. Building on these results, we show that unity-efficiency non-reciprocal modulation, necessary for a robust acousto-optic isolator, is within reach. The acousto-optic modulator design is compatible with both CMOS fabrication and existing silicon photonic device technologies. These results represent a promising new approach to implement compact and scalable acousto-optic modulators, frequency-shifters, and non-magnetic optical isolators and circulators in integrated photonic circuits.

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• Gigahertz modulation of a fully dielectric nonlocal metasurface
• Octave Spanning Visible to SWIR Integrated Coil-Stabilized Brillouin Lasers
• Broadband acousto-optic modulators on Silicon Nitride
• Light modulation in Silicon photonics by PZT actuated acoustic waves
• Piezoelectric optomechanical approaches for efficient quantum microwave-to-optical signal transduction: the need for co-design
• On-chip cavity electro-acoustics using lithium niobate phononic crystal resonators
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• A paradigm for universal quantum information processing with integrated acousto-optic frequency beamsplitters