Fig. 3 Achromatic metasurfaces for ultra-broadband acoustic focusing (IMAGE)

Science China Press

Fig. 3 Achromatic metasurfaces for ultra-broadband acoustic focusing

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a, Inverse-designed achromatic metssurfaces; b, Theoretical and optimized effective indices; c, Transmission coefficients of elements; d, Acoustic focusing at multiple frequencies; e, Acoustic intensity profiles of the focal plane.

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