Terahertz tight-focused Bessel beam generation and point-to-point focusing based on nonlocal diffraction engineering.
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DOI: 10.1364/ol.460747
Abstract: Metasurfaces transform the wavefront by spatially varying the amplitude or phase of the incoming beam. Instead of encoding such variation by subwavelength unit cells, it is achievable over diffraction engineering of supercell structures, which outperforms… read more here.
Keywords: bessel beam; point point; point; point focusing ... See more keywords