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Phononic Quasicrystals
Published online by Cambridge University Press: 01 February 2011
Abstract
Phononic crystals are to sound what photonic crystals are to light and crystals are to electrons. If the wavelength is of the same order of magnitude as the typical distances between the objects in their ordered arrangement, then the interaction is dominated by diffraction besides refraction. Depending on the spectral properties of the material, band gaps appear for certain frequencies. In special cases, these gaps are omni-directional. A huge amount of application-driven research has been performed on photonic crystals, much less on phononic crystals, and almost nothing on phononic quasicrystals. We present here the first experimental studies on two-dimensional, quasiperiodic, phononic crystals. Our experiments have been performed with ultrasound on phononic crystals and quasicrystals consisting of steel cylinders in water. The pros and cons of phononic quasicrystals are discussed.
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- Copyright © Materials Research Society 2004