نتایج جستجو برای: phononic crystal
تعداد نتایج: 160128 فیلتر نتایج به سال:
Artificial honeycomb lattices with Dirac cone dispersion provide a macroscopic platform to study the massless Dirac quasiparticles and their novel geometric phases. In this paper, a quadruple-degenerate state is achieved at the center of the Brillouin zone in a two-dimensional honeycomb lattice phononic crystal, which is a result of accidental degeneracy of two double-degenerate states. In the ...
The acoustic wave velocity depends on elasticity and density at most materials, but because of anisotropy and especially piezoelectric coupling effect, the acoustic wave propagation at piezoelectric based crystalloacoustic materials, is an applied and challenging problem. In this paper, using modified Christoffel's equation based on group velocity concept, the effect of anisotropy and piezoelec...
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We map the band structure of surface acoustic modes of a periodic array of copper lines embedded in a SiO2 film on a silicon substrate by means of the laser-induced transient grating technique. A detailed map of the lowest sheet of the ω(k) surface and partial maps of two higher-order sheets are obtained. We discuss the topology of the ω(k) surface and explain how it arises from the Rayleigh an...
This study was aimed at using the theory for two-dimensional phononic crystal consisting of materials with general anisotropy to calculate the band gaps phenomena in Aluminum/Barium sodium niobate (Y-cut) with hexagonal lattice and Quartz/Epoxy with square lattice phononic structures. Wave propagation properties of solids in which the periodic modulation occurs along the bounding surface has be...
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