Phononic crystal wave structures

In a communications device capable of receiving data from and transmitting data to another communications device, the communications device comprising an acoustical wave system enabling acoustical waves to pass through the system via a micro/nano-mechanical acoustical device, the acoustical wave system comprising:

• a phononic crystal acoustic wave medium disposed between an input transducer and an output transducer, the acoustical wave medium enabled to allow acoustic waves to propagate between the transducers, the input transducer configured to excite the acoustic wave medium and the output transducer configured to receive acoustical wave excitation energy;
• the acoustic wave medium comprising a plurality of phononic crystal plate sections each containing a multi-dimensional periodic array of empty inclusions creating a phononic band gap, the periodic array of inclusions being disposed so that only acoustic waves of predetermined frequency or range of frequencies to propagate through the acoustic wave medium;
• the acoustic wave medium being sized and shaped to contain acoustical waves within the interior volume space of the acoustic wave medium;
• and
• the acoustic wave medium comprising at least one defect region disposed among the periodic array of empty inclusions, the defect region capable of allowing acoustic waves to propagate through the defect region.