Acoustic metamaterials are of growing interest due to their ability
to manipulate the propagation of acoustic waves in an extraordinary
manner to benefit various applications, such as communications,
biosensing, and medical diagnosis and therapy. Among various
construction methods of acoustic metamaterials, artificially
engineered elastic periodic structures, known as phononic crystals
(PCs), are the strongest candidates since they exhibit complete
phononic band gaps and negative refractions due to the periodicity
of the structure. In this book, a new class of acoustic
metamaterials-gradient-index phononic crystal (GRIN PC)-is
introduced to overcome the limitations of regular PCs and further
enrich the control over acoustic waves. GRIN PCs with different
gradient profiles are designed to guide acoustic waves in
extraordinary manners that are not shown in nature or regular PCs.
A practical method for tuning the phononic band gaps of a PC is
investigated. The concepts presented in this book serve as
important foundations for the future development of acoustic
devices.
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