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Superoscillations and leaky spectra

Research output: Contribution to journalArticle

Original languageEnglish
Article number015202
Number of pages11
JournalJournal of Physics A: Mathematical and Theoretical
Volume52
Issue number1
Early online date30 Nov 2018
DOIs
DateAccepted/In press - 6 Nov 2018
DateE-pub ahead of print - 30 Nov 2018
DatePublished (current) - 4 Jan 2019

Abstract

Superoscillatory functions - band-limited functions with local oscillations faster than their fastest Fourier components - are extended to families that are 'leaky' - not band-limited - but possess the same local oscillations. Two different extensions are presented. For deterministic functions, the prototype superoscillatory function is embedded in a leaky one-parameter family that can be studied in detail analytically. For Gaussian random superoscillatory functions, the coefficients in the Fourier series that represents them are modified so as to change the power spectrum from band-limited to leaky. Fast oscillations in leaky functions can be indistinguishable from superoscillations, but in practice this is unlikely to be important.

    Research areas

  • band-limited, Fourier, weak value

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