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. 2024 Nov 13;10(46):eads2654. doi: 10.1126/sciadv.ads2654

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Fig. 4. — The schematic diagram in (A) shows the simulation and the experimental setup to create the standing acoustic wave inside of the RR and waveguide by two directly opposite input signals p₁ and p₂. The signal will be pumping with signals p₃ and p₄ where a standing wave will be created by CCW and CW modes in the RR. (B) Black lines show the normalized acoustic signal inside the center RR. The transmission in ports 2 to 6 is shown in (C) to (E). (F) Simulation result shows the one input signal p_in with two pumping outputs p_pump with designed three waveguides with one RR, the mode in the RR is CCW mode. (G) Simulation result shows the two same input signals p_in with one pumping output p_pump; the mode in the RR is CCW mode. (H) Simulation result shows the two different input signals that create the CCW mode and CW mode in the RR, respectively.