Font Size: 

Superoscillations may occur in regions of a band-limited signal with small amplitude having oscillations faster than the fastest Fourier component of the signal. In optical region, superresolution can be achieved by appropriate design of pupil functions where the angular aperture determines the focal spot smaller than the Abbe diffraction limit outside the evanescent field region. The angular aperture cannot be increased indefinitely and the huge sidelobes cannot be avoided that are present in superoscillation filters. The limitations of using such kind of filters in practical applications are discussed through numerical examples.

Nanophotonics; Superresolution