Focusing ultrasound with an acoustic metamaterial network
S Zhang, L Yin, N Fang - Physical review letters, 2009 - APS
S Zhang, L Yin, N Fang
Physical review letters, 2009•APSWe present the first experimental demonstration of focusing ultrasound waves through a flat
acoustic metamaterial lens composed of a planar network of subwavelength Helmholtz
resonators. We observed a tight focus of half-wavelength in width at 60.5 kHz by imaging a
point source. This result is in excellent agreement with the numerical simulation by
transmission line model in which we derived the effective mass density and compressibility.
This metamaterial lens also displays variable focal length at different frequencies. Our …
acoustic metamaterial lens composed of a planar network of subwavelength Helmholtz
resonators. We observed a tight focus of half-wavelength in width at 60.5 kHz by imaging a
point source. This result is in excellent agreement with the numerical simulation by
transmission line model in which we derived the effective mass density and compressibility.
This metamaterial lens also displays variable focal length at different frequencies. Our …
We present the first experimental demonstration of focusing ultrasound waves through a flat acoustic metamaterial lens composed of a planar network of subwavelength Helmholtz resonators. We observed a tight focus of half-wavelength in width at 60.5 kHz by imaging a point source. This result is in excellent agreement with the numerical simulation by transmission line model in which we derived the effective mass density and compressibility. This metamaterial lens also displays variable focal length at different frequencies. Our experiment shows the promise of designing compact and lightweight ultrasound imaging elements.
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