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Phonons, representing the quantized excitation modes of both solid elastic waves and fluid acoustic waves, possess wavelengths akin to those of electromagnetic waves and frequencies that align with electronic circuits. This alignment facilitates efficient coupling between photons and phonons within integrated circuits. Phononics plays a pivotal role in modern information technology, finding widespread applications in radio frequency signal processing, navigation, sensing, non-destructive testing, waveguides, information processing, as well as sophisticated military technology systems. Nevertheless, the propagation of elastic waves through conventional waveguides is prone to backscattering upon encountering structural imperfections or disorder.
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