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Creation and preservation of superoscillation in a dielectric optical waveguide

Version 2 2023-02-21, 21:25
Version 1 2023-02-21, 21:25
Posted on 2023-02-21 - 21:25
Superoscillation refers to a phenomenon where a bandlimited wave locally oscillates faster than its highest Fourier component. Current research on optical superoscillations predominantly lies on the basis of free-space waves. As optical waveguide plays a key role in energy and information transporting, guided waves with precisely controlled deep-subwavelength features offers unprecedented flexibility for applications. In this letter, we numerically show that, by superimposing eigenmodes of a multimode SiO2 waveguide and forcing the resultant field to pass through a set of predetermined points, superoscillatory fields in various shapes can be formed in preset cross-sectional planes. Furthermore, by padding prescribed intensities in multiple crosssections, we successfully create a persistent superoscillatory saddle.

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Optics Letters

AUTHORS (4)

Zhenli Zhan
xutao wang
Jiayuan Wang
Ye Luo

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