Superresolution quantitative imaging based on superoscillatory field

The superresolution imaging of high-contrast objects is of great interest to many researchers. We propose a new method to achieve superresolution in inverse-scattering imaging of high-contrast dielectric objects. In the scheme of nonlinear inverse scattering, spatial superoscillatory incident fields are designed and applied in this research in order to retain the high-spatial-frequency components of the objects. The reconstruction results show that the proposed method resolves two objects with spacing 0.13λ. Compared with the orbital angular momentum (OAM)-carrying fields that compose a typical superoscillatory wave, the designed waveform is capable of achieving superresolution over the entire region of interest (ROI), while OAM possesses a limited superresolution area near the center of the ROI, which verifies the effectiveness of the proposed method.