A phase−matching condition for scattering from acoustic surface reflective arrays is derived with velocity slowing of the reflective stripes taken into account. Propagation in a periodic region is described in terms of waves with sawtooth−shaped phase fronts. Stored energy is proposed as a mechanism for altering the effective velocity anisotropy between incident and scattered waves. The theory is tested against measured transmission resonances for metallic (Al) gratings on Y−cut LiNbO3.
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O.W. Otto (1975) studied this question.
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