Acoustic metalens for subwavelength resolution based on transformation acoustics

We propose a new approach to design acoustic metematerials lens for subwavelength resolution imaging based on transformation acoustics. The proposed acoustic magnifier creates high resolution over broadband. The high-resolution imaging property effect is demonstrated numerically from 5650 Hz to 6350 Hz. This is an important property that can be leveraged in many potential applications, including the implementation of highly sub-wavelength medical diagnose and detection.