Design of acoustic negative refractive index lens

High-resolution acoustic imaging techniques are the essential tools for nondestructive testing and sonography .For these imaging application, we need acoustic lens with sharp focus, tunable focal length and potable small size. In this project, we design an acoustic metamaterial lens composed of a planar network of subwavelength Helmholtz resonators. The considerably smaller size of the Helmholtz resonator to the corresponding resonant wavelength, allows a compact and light weight design for kilohertz frequency applications.

Figure 1. Acoustic metamaterial network