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. 2015 Jun 16;5:10966. doi: 10.1038/srep10966

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Copyright © 2015, Macmillan Publishers Limited

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The sample is made of 40 grooves with d = 1cm and d₀ = 0.75cm. (a, b, c) Numerical results of the scattered acoustic intensity fields for normally-incident plane wave at frequencies of 7.277 kHz, 12.128 kHz, and 16.979 kHz, respectively. The trajectory is (x + r)² + y² = r² (dashed line). (d, e, f) Acoustic intensity fields given by Eq. (6) at different frequencies.