Lithium niobate phononic crystals for radio frequency SH0 waves

The first lithium niobate phononic crystals (PnCs) exhibiting band gaps for SH0 modes waves have been designed and demonstrated on X-cut thin films. Transmission properties of PnCs have been experimentally studied in phononic delay lines consisting of wideband input and output transducers separated by PnCs. An equivalent circuit model that incorporates PnCs acoustic scattering matrix and the conventional Mason's model has been constructed to accurately predict the experimental results. The measured devices show 20 dB attenuation for the SH0 mode in the stop-bands with less than 2 dB loss in the pass-bands.