Creation and preservation of superoscillation in a dielectric optical waveguide
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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Zhan, Zhenli; wang, xutao; Wang, Jiayuan; Luo, Ye (2023). Creation and preservation of superoscillation in a dielectric optical waveguide. Optica Publishing Group. Collection. https://doi.org/10.6084/m9.figshare.c.6393282.v2
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