Figure 2
From: Breaking the acoustic diffraction limit with an arbitrary shape acoustic magnifying lens
(a,b) The near and far field results of two line sources located at the sub-wavelength distance of \(d=0.2 \lambda\). It is clear that the diffraction effect is significant in this case, which subsequently leads the farfield image to not be resolved appropriately. (c,d) The results of the same sources when they are separated by the distance of \(D=\lambda\) which is not sub-wavelength. It is evident that under this circumstance, the generated image in the farfield can be resolved which is attributed to the fact that the diffraction limit has been obviated. (e,f) The near and far field results of the designed ASML with ANM when the sources are located at the sub-wavelength distance (i.e., \(d=0.2 \lambda\)). The obtained results are well abiding the attained results in (c,d).
