Fig. 4 Achromatic metasurfaces for ultra-broadband ultra-sound levitation (IMAGE)

Science China Press

Fig. 4 Achromatic metasurfaces for ultra-broadband ultra-sound levitation

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a, Inverse-designed achromatic metssurfaces and representative elements; b-c, Theoretical (b) and optimized (c) effective indices; d, Transmission coefficients of elements; e, Simulated ultrasound levitation at multiple frequencies; f, Measured particle levitation at 32 kHz and 40 kHz.

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