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Using superoscillations for superresolved imaging and subwavelength focusing

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Gbur, G. (2019). Using superoscillations for superresolved imaging and subwavelength focusing. Nanophotonics. https://doi.org/doi:10.1515/nanoph-2018-0112
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Description

It is now well-appreciated that a bandlimited wave can possess oscillations much more rapidly than those predicted by the bandlimit itself, in a phenomenon known as superoscillation. Such superoscillations are required to be of dramatically smaller amplitude than the signal they are embedded in, and this has initially led researchers to consider them of limited use in applications. However, this view has changed in recent years and superoscillations have been employed in a number of systems to beat the limits of conventional diffraction theory. In this review, we discuss the current state of research on superoscillations in terms of superresolved imaging and subwavelength focusing, including the use of special nondiffracting and Airy beams to carry transverse superoscillating patterns. In addition, we discuss recent analogous works on using superoscillations to break the temporal resolution limit, and also consider the recently introduced inverse of superoscillations, known as suboscillations.

Details
Title

Using superoscillations for superresolved imaging and subwavelength focusing

Author(s)

Gbur, Greg

UNC Charlotte Affiliate Type

Faculty

Publisher

De Gruyter

Extent

1 online resource

Date Published

2019

Material Type

Journal article

Genre

articles

Resource Type

text

Abstract

It is now well-appreciated that a bandlimited wave can possess oscillations much more rapidly than those predicted by the bandlimit itself, in a phenomenon known as superoscillation. Such superoscillations are required to be of dramatically smaller amplitude than the signal they are embedded in, and this has initially led researchers to consider them of limited use in applications. However, this view has changed in recent years and superoscillations have been employed in a number of systems to beat the limits of conventional diffraction theory. In this review, we discuss the current state of research on superoscillations in terms of superresolved imaging and subwavelength focusing, including the use of special nondiffracting and Airy beams to carry transverse superoscillating patterns. In addition, we discuss recent analogous works on using superoscillations to break the temporal resolution limit, and also consider the recently introduced inverse of superoscillations, known as suboscillations.

Subjects--Topics

Fluctuations (Physics)

Is Part Of

Nanophotonics

Volume

8

Issue

2

ISSN

2192-8614

Beginning Page Number

205

Ending Page Number

225

Language

English

Published Version (Please cite this version)

doi:10.1515/nanoph-2018-0112

Publisher's Version

https://doi.org/10.1515/nanoph-2018-0112

Permalink

http://hdl.handle.net/20.500.13093/work:63

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