An acoustic Maxwell’s fish-eye lens based on gradient-index metamaterials
Yuan Bao-guo1, 2, Tian Ye1, Cheng Ying1, 3, †, 
, Liu Xiao-jun1, 3, ‡,
, Liu Xiao-jun1, 3, ‡, Normalized pressure amplitudes passing through the focal spot for the AMFE lens with different frequencies at 1 kHz, 1.5 kHz, and 2 kHz.
