Fig. 1

Simulated PnC band diagram, displacement profiles and tailorability plots. a Total displacement surface plots for modes A and B for the entire unit cell and for only the locally resonant structure. b SAW band diagram generated through finite element method simulation of annular hole unit cell with pitch 10.9 µm, inner radius 3.1 µm, outer radius 5.1 µm and hole depth 6.4 µm. The blue line represents the soundline and the red lines represent propagating SAW bands within the 1st Brillouin zone. The teal bar represents the PnC complete bandgap. c Bandgap limits of annular hole PnC against inner radius of the holes with cross section schematic of unit cell, with R _o, R _i and D being the outer radius, inner radius and depth of the annular hole respectively. The data points represent upper and lower frequency limits of the complete bandgap shaded in blue. The lines are polynomial fits to guide. d Bandgap limits against depth of the holes