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Title: Optical superoscillation technologies beyond the diffraction limit
Authors: Zheludev, Nikolay I. 
Yuan, Guanghui
Keywords: Science::Physics::Optics and light
Issue Date: 2022
Source: Zheludev, N. I. & Yuan, G. (2022). Optical superoscillation technologies beyond the diffraction limit. Nature Reviews Physics, 4, 16-32.
Project: NRF-CRP23-2019-0006
SERC A1685b0005
Journal: Nature Reviews Physics
Abstract: Optical superoscillations are rapid, subwavelength spatial variations of the intensity and phase of light, occurring in complex electromagnetic fields formed by the interference of several coherent waves. The discovery of superoscillations stimulated a revision of the limits of classical electromagnetism — in particular, the studies of phenomena such as unlimitedly small energy hotspots, phase singularities, energy backflow, anomalously high wavevectors and their intriguing similarities to the evanescent plasmonic fields on metals. In recent years, the understanding of superoscillatory light has led to the development of superoscillatory lensing, imaging and metrology technologies. Dielectric, metallic and metamaterial nanostructured superoscillatory lenses have been introduced that are able to create hotspots smaller than allowed by conventional lenses. Far-field, label-free, non-intrusive deeply subwavelength super-resolution imaging and metrology techniques that exploit high light localization and rapid variation of phase in superoscillatory fields have also been developed, including new approaches based on artificial intelligence. We review the fundamental properties of superoscillatory optical fields and examine emerging technological applications.
ISSN: 2522-5820
DOI: 10.1038/s42254-021-00382-7
Rights: © 2021 Springer Nature Limited. All rights reserved. This paper was published in Nature Reviews Physics and is made available with permission of Springer Nature Limited.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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