期刊
NATURE PHOTONICS
卷 15, 期 1, 页码 43-52出版社
NATURE PORTFOLIO
DOI: 10.1038/s41566-020-00711-9
关键词
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资金
- National Aeronautics and Space Administration
- National Science Foundation [DGE1122492]
This study demonstrates direct acousto-optic modulation within silicon waveguides using electrically-driven surface acoustic waves, achieving non-reciprocal modulation with high bandwidth and low insertion loss, compatible with existing silicon photonic device architectures.
Emerging technologies based on tailorable photon-phonon interactions promise new capabilities ranging from high-fidelity information processing to non-reciprocal optics and quantum state control. However, many existing realizations of such light-sound couplings involve unconventional materials and fabrication schemes challenging to co-implement with scalable integrated photonic circuitry. Here, we demonstrate direct acousto-optic modulation within silicon waveguides using electrically driven surface acoustic waves (SAWs). By co-integrating electromechanical SAW transducers with a standard silicon-on-insulator photonic platform, we harness silicon's strong elasto-optic effect to create travelling-wave phase and single-sideband amplitude modulators from 1 to 5 GHz, with index modulation strengths comparable to electro-optic technologies. Extending this non-local interaction to centimetre scales, we demonstrate non-reciprocal modulation with operation bandwidths of >100 GHz and insertion losses of <0.6 dB. This acousto-optic platform is compatible with complementary metal-oxide-semiconductor fabrication processes and existing silicon photonic device architectures, opening the door to flexible, low-loss modulators and non-magnetic optical isolators and circulators in integrated photonic circuits.
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