Figure 1
From: Superoscillations without Sidebands: Power-Efficient Sub-Diffraction Imaging with Propagating Waves

Superoscillation waveform design.
(a) An amplitude plot of spectral (plane wave) components which make up the superoscillation waveform. Note that all plane waves are propagating, since for all of them |kx| ≤ k0. (b)–(c) The spatial profile of the superoscillation waveform, plotted (b) across the region of superoscillation (blue, solid), in comparison with the diffraction-limited sinc function (green, dashed) and (c) across one period of the waveform.