Journal
PHYSICAL REVIEW B
Volume 80, Issue 23, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.235118
Keywords
acoustic materials; composite materials; energy gap; metamaterials; phononic crystals; refractive index
Funding
- Hong Kong RGC [600305]
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We examine the complex band structures and effective medium descriptions of a periodic acoustic composite system. It is shown that if the system exhibits a negative velocity band, the assignment of the system as a phononic crystal or as a double negative metamaterial is unambiguous only in some cases. An example is given where the system properties can be tuned gradually and continuously from an acoustic metamaterial to a phononic crystal, and there is no sharp dividing line between these two regimes.
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