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Hybrid integrated photonics using bulk acoustic resonators.

  • Tian H OxideMEMS Lab, Purdue University, 47907, West Lafayette, IN, USA.
  • Liu J Institute of Physics, Swiss Federal Institute of Technology Lausanne (EPFL), 1015, Lausanne, Switzerland.
  • Dong B OxideMEMS Lab, Purdue University, 47907, West Lafayette, IN, USA.
  • Skehan JC Institute of Physics, Swiss Federal Institute of Technology Lausanne (EPFL), 1015, Lausanne, Switzerland.
  • Zervas M Institute of Physics, Swiss Federal Institute of Technology Lausanne (EPFL), 1015, Lausanne, Switzerland.
  • Kippenberg TJ Institute of Physics, Swiss Federal Institute of Technology Lausanne (EPFL), 1015, Lausanne, Switzerland. tobias.kippenberg@epfl.ch.
  • Bhave SA OxideMEMS Lab, Purdue University, 47907, West Lafayette, IN, USA. bhave@purdue.edu.
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  • 2020-06-20
Published in:
  • Nature communications. - 2020
General Biochemistry, Genetics and Molecular Biology
General Physics and Astronomy
General Chemistry
English Integrated photonic devices based on Si3N4 waveguides allow for the exploitation of nonlinear frequency conversion, exhibit low propagation loss, and have led to advances in compact atomic clocks, ultrafast ranging, and spectroscopy. Yet, the lack of Pockels effect presents a major challenge to achieve high-speed modulation of Si3N4. Here, microwave-frequency acousto-optic modulation is realized by exciting high-overtone bulk acoustic wave resonances (HBAR) in the photonic stack. Although HBAR is ubiquitously used in modern communication and superconducting circuits, this is the first time it has been incorporated on a photonic integrated chip. The tight vertical acoustic confinement releases the lateral design of freedom, and enables negligible cross-talk and preserving low optical loss. This hybrid HBAR nanophotonic platform can find immediate applications in topological photonics with synthetic dimensions, compact opto-electronic oscillators, and microwave-to-optical converters. As an application, a Si3N4-based optical isolator is demonstrated by spatiotemporal modulation, with over 17 dB isolation achieved.
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  • English
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gold
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https://folia.unifr.ch/global/documents/16207
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