Broadband superoscillation brings a wave into perfect three-dimensional

被引:18
作者
Wong, Alex M. H. [1 ]
Eleftheriades, George V. [1 ]
机构
[1] Univ Toronto, Edward S Rogers Sr Dept Elect & Comp Engn, Toronto, ON M5S 2E4, Canada
关键词
DIFFRACTION; RESOLUTION; FIELD; RESTORATION; PHASE; IMAGE; RECONSTRUCTION; REALIZATION; MICROSCOPE; BREAKING;
D O I
10.1103/PhysRevB.95.075148
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The fundamental properties of a wave precludes it from being localized to subwavelength distances in all dimensions of the wave's existence. The inability to focus electromagnetic waves to an all-direction subwavelength spot limits the 3D resolution of a conventional imaging system to about half the imaging wavelength. A plethora of super-resolution imaging systems have been designed which obtain super-resolution in one or two (but not all) dimensions, but they suffer various restrictions in working distance and the classes of objects they can image. In this paper, we report a first investigation into a wave that is focused to subwavelength dimensions in all directions. After reviewing the physics of wave dispersion and diffraction which seemingly preclude this phenomenon, we sidestep these preclusions using a broadband superoscillation waveform and synthesize an all-direction subwavelength focus. We report the salient spatial and temporal features of this wave, and apply it to achieve 3D super-resolution imaging.
引用
收藏
页数:8
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