PHYSICAL REVIEW APPLIED 13, 041001 (2020)

JIE ZHU et al. PHYS. REV. APPLIED 13, 041001 (2020) tuning semitransparent acoustic mirrors with an interme-diate mode converter, all elements resonate concurrently at the operating frequency, driving the forward-direction transmission efficiency into a maximum approaching 100%. As shown in Fig. 1, the unidirectional acoustic resonant ................
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