Fig. 7: Two-faced wavefront manipulation, encoding focusing for FD (forward direction), and extraordinary refraction for BD (backward direction). | Nature Communications

Fig. 7: Two-faced wavefront manipulation, encoding focusing for FD (forward direction), and extraordinary refraction for BD (backward direction).

From: Janus acoustic metascreen with nonreciprocal and reconfigurable phase modulations

Fig. 7

a The phase profiles along y-direction of acoustic focusing for FD and extraordinary refraction for BD are φ1 = 117.8((x − 0.1)2 + y2)0.5 − 11.78 + π rad, and φ2 = 83.3 y + π rad, respectively. b Corresponding h1 and h2 values for FD and BD, respectively. c, d Corresponding simulated (sim.) and experimental (exp.) acoustic pressure distributions at 6430 Hz for PD in (c) and BD in (d).

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