Surface acoustic waves for acousto-optic modulation in buried silicon nitride waveguides.

  title={Surface acoustic waves for acousto-optic modulation in buried silicon nitride waveguides.},
  author={Peter J. M. van der Slot and Marco A. G. Porcel and Klaus J. Boller},
  journal={Optics express},
  volume={27 2},
We theoretically investigate the use of Rayleigh surface acoustic waves (SAWs) for refractive index modulation in optical waveguides consisting of amorphous dielectrics. Considering low-loss Si3N4 waveguides with a standard core cross-section of 4.4×0.03 μm2 size, buried 8-μm deep in a SiO2 cladding, we compare surface acoustic wave generation in various different geometries via a piezo-active, lead zirconate titanate film placed on top of the surface and driven via an interdigitized transducer… 

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