Complete bandgap SAW phononic resonators

2D composite grating building blocks with hexagonal symmetry are proposed as efficient reflectors and transducers in the design of surface acoustic wave (SAW) resonators. Design parameters ensuring complete bandgap characteristics are deduced by means of finite element analysis (FEA). SAW resonators employing phononic building blocks with complete bandgaps are designed, fabricated and tested. Further, the influence of the phononic grating over the spurious responses and the busbar quality are experimentally tested. All test structures are fabricated on 128 Y-X LiNbO3 using low resolution optical lithography and standard metal deposition and etching routines.