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This work presents a new super-resolution imaging approach by usingsubwavelength hole resonances. We employ a subwavelength structure in which anarray of tiny holes are etched in a metallic slab with the neighboring distance$\ell$ that is smaller than half of the wavelength. By tuning the incident waveat resonant frequencies, the subwavelength structure generates strongillumination patterns that are able to probe both low and high spatialfrequency components of the imaging sample sitting above the structure. Theimage of the sample is obtained by performing stable numerical reconstructionfrom the far-field measurement of the diffracted wave. It is demonstrated thata resolution of $\ell/2$ can be obtained for reconstructed images, thus one canachieve super-resolution by arranging multiple holes within one wavelength.  The proposed approach may find applications in wave-based imaging such aselectromagnetic and ultrasound imaging. It attains two advantages that areimportant for practical realization. It avoids the difficulty to control thedistance the between the probe and the sample surface with high precision. Inaddition, the numerical reconstructed images are very stable against noise byonly using the low frequency band of the far-field data in the numericalreconstruction.

A super-resolution imaging approach via subwavelength hole resonances