Three-dimensional acoustic asymmetric focusing by mode-conversion structure
نویسندگان
چکیده
Acoustic asymmetric focusing (AAF) has attracted widespread attention owing to its great potential in medical ultrasound. The recent development of acoustic metamaterials and metasurfaces provided various concepts achieve AAF systems. Generally, the previously demonstrated lenses were limited one-dimensional structures, leading difficulties practical applications. realization three-dimensional (3D) space based on a two-dimensional (2D) device still remains challenge. Here, we experimentally numerically study 2D lens mode converters composed two pairs phased unit cells I II step waveguide. Based phase profile sound waveguide converters, design demonstrate type observe transmission simultaneously 3D under excitation zero-order wave. Both phenomena arise from modulation cutoff frequency first-order wave for waveguide, respectively. fractional bandwidth (the ratio center frequency) can reach about 0.14. proposed lens, as well associated converter, paves way manipulation that applications devices.
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ژورنال
عنوان ژورنال: Journal of Applied Physics
سال: 2023
ISSN: ['1089-7550', '0021-8979', '1520-8850']
DOI: https://doi.org/10.1063/5.0162326