Abstract
An acoustic jet generated by a mesoscale particle has been proved to be able to achieve sub-wavelength focusing. In this work, we propose two kinds of mask structures to accurately modulate the characteristics of the acoustic jet, such as the focal distance, FWHM and decay length by adjusting the position of incident sound waves. Our simulations show that an ultra-narrow beam waist width (λ/3) in the near field and an ultra-long beam (7λ) in the far field can be achieved under plane wave illumination. This structure provides a simple method to precisely control the acoustic jet.
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