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    Sub-diffraction focusing of light by aperiodic masks
    (Taylor and Francis Ltd., 2022) Mostafavi, Seyeddyako; Nutku, Ferhat; Ekşioğlu, Yasa
    Diffraction of a spherical wave through various types of 2D aperiodic hollow masks is investigated computationally. Unlike a periodic transmissive grating, an aperiodic hollow mask can focus light into a hotspot with sub-wavelength diameter. In this work, several types of 2D aperiodic hollow masks are investigated in the framework of sub-diffraction focusing of light and generating superoscillations at the hotspot region.