Superoscillation

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Superoscillation is a phenomenon in which a signal which is globally band-limited can contain local segments that oscillate faster than its fastest Fourier components. The idea is originally attributed to Yakir Aharonov, and has been made more popularly known through the work of Michael Berry, who also notes that a similar result was known to Ingrid Daubechies.[1][2] A practical method for constructing superoscillations and a discussion of their potential for quantum field theory were given by Achim Kempf.[3] In 2013 experimental generation of arbitrarily shaped diffractionless superoscillatory optical beams has been demonstrated.[4] Kempf and Ferreira proved [5] that superoscillations come at the expense of a dynamical range that has to increase exponentially with the number of superoscillations and polynomially with the frequency of the superoscillations.

Superoscillatory wave forms are being considered as a possible practical tool for engineering applications, such as optical superresolution, i.e., resolution beyond the diffraction limit.[6][7]

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