Journal
PHYSICAL REVIEW B
Volume 83, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.83.064301
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Funding
- Agence Nationale de la Recherche [ANR-09-BLAN-0167-01]
- Agence Nationale de la Recherche (ANR) [ANR-09-BLAN-0167] Funding Source: Agence Nationale de la Recherche (ANR)
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The influence of material loss on the complex band structure of two-dimensional phononic crystals is investigated. A viscoelasticity model is added to the extended plane-wave expansion (EPWE) method, with viscosity proportional to the frequency. It is found that losses have a stronger influence on the real than on the imaginary part of Bloch waves, in contrast with propagation in homogeneous media. Flat bands, i.e., bands initially showing low group velocity without losses, acquire an enhanced damping as compared to bands with larger group velocities. Losses are also found to limit the appearance of large group slownesses, or conversely small group velocities.
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