In this work, we present a new methodology to design a phononic crystal flat lens for super-resolution imaging. We exploit the anisotropy of equal frequency contours (EFCs) of a square lattice for broadband subwavelength imaging of flexural elastic waves in an aluminum plate. We further demonstrate that the image resolution can be significantly improved by breaking the diffraction limit, which is 0.5 times the wavelength. The plate-EFCs are designed to be smaller than the PC-EFCs so that the evanescent waves in the plate are amplified by the propagating modes in the PC. We obtained a super-resolution of 0.4 times the wavelength, which can be improved further with design optimization.

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Hrishikesh Danawe and Serife Tol, "Harnessing negative refraction in the creation of perfect lens for super-resolution imaging," Proc. SPIE PC12483, Active and Passive Smart Structures and Integrated Systems XVII, PC1248304 (Presented at SPIE Smart Structures + Nondestructive Evaluation: March 13, 2023; Published: 28 April 2023); https://doi.org/10.1117/12.2658386.6323740539112.