<< the extreme frequency sound waves - also known as surface acoustic waves [SAW] or 'nanoquakes' , as they run across the surface of a solid material in a similar manner to earthquake tremors on land >>
<< Although surface acoustic waves form a key component of a host of technologies, they have proved extremely difficult to control with any degree of accuracy >>
[AA] << have developed a new type of structure, known as a ' phononic crystal,' which when patterned into a device, can be used to steer and guide the nanoquakes >>
Riding the wave: Pioneering research tames nanoquakes. Aug 2, 2017
https://m.phys.org/news/2017-08-nanoquakes.html
<< Phononic crystals can control the propagation of SAW, analogous to photonic crystals, enabling components such as waveguides and cavities >>
B. J. Ash, S. R. Worsfold, et al. A highly attenuating and frequency tailorable annular hole phononic crystal for surface acoustic waves. Nature Communications 8, Article number: 174 (2017) doi:10.1038/s41467-017-00278-0
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