Abstract
We investigated theoretically the band structures of Lamb waves in one-dimensional (1D) phononic crystal (PC) plates coated symmetrically with finite Tungsten or Silicon loading layers on both sides. Numerical results show that when a thin PC plate is bordered with the Silicon loading layers, both the midgap frequencies of the first band gaps of S 0 and A 0 modes change approximately linearly with the thickness of the Silicon loading layers. These two modes may be used as a sensor.
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