Dissipative interaction and anomalous surface absorption of bulk phonons at a two-dimensional defect in a solid

We predict an extreme sensitivity to the dissipative losses of the resonant interaction of bulk phonons with a 2D defect in a solid. We show that the total resonant reflection of the transverse phonon at the 2D defect, descri bed earlier without an account for dissipation, occurs only in the limit of extremely weak dissipation and is changed into almost total transmission b y relatively weak bulk absorption. Anomalous surface absorption of the tran sverse phonon, when one half of the incident acoustic energy is absorbed at the 2D defect, is predicted for the case of "intermediate" bulk dissipatio n. (C) 1999 Elsevier Science B.V.