Journal
PHYSICAL REVIEW LETTERS
Volume 118, Issue 25, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.118.254302
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Funding
- European Research Council (ERC) starting grant (ANAMORPHISM)
- Agence Nationale de la Recherche under ANR PLATON [12-BS09-003-01]
- LABEX WIFI [ANR-10-LABX-24, ANR-10-IDEX-0001-02 PSL*]
- PICS-ALAMO
- Israel Science Foundation [1871/15, 2074/15]
- United States-Israel Binational Science Foundation NSF/BSF [2015694]
- Engineering and Physical Sciences Research Council (EPSRC) (UK)
- Engineering and Physical Sciences Research Council [EP/L024926/1] Funding Source: researchfish
- EPSRC [EP/L024926/1] Funding Source: UKRI
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Periodic structures can be engineered to exhibit unique properties observed at symmetry points, such as zero group velocity, Dirac cones, and saddle points; identifying these and the nature of the associated modes from a direct reading of the dispersion surfaces is not straightforward, especially in three dimensions or at high frequencies when several dispersion surfaces fold back in the Brillouin zone. A recently proposed asymptotic high-frequency homogenization theory is applied to a challenging time-domain experiment with elastic waves in a pinned metallic plate. The prediction of a narrow high-frequency spectral region where the effective medium tensor dramatically switches from positive definite to indefinite is confirmed experimentally; a small frequency shift of the pulse carrier results in two distinct types of highly anisotropic modes. The underlying effective equation mirrors this behavior with a change in form from elliptic to hyperbolic exemplifying the high degree of wave control available and the importance of a simple and effective predictive model.
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