Format:
Online-Ressource
ISSN:
1521-4095
Content:
Abstract: Metasurfaces are 2D engineered structures with subwavelength granularity, offering a wide range of opportunities to tailor the impinging wavefront. However, fundamental limitations on their efficiency in wave transformation, associated with their deeply subwavelength thickness, challenge their implementation in practical application scenarios. Here, it is shown how the coherent control of metagratings through multiple wave excitations can provide new opportunities to achieve highly reconfigurable broadband metasurfaces with large diffraction efficiency, beyond the limitations of conventional approaches. Remarkably, energy distribution between the 0th and higher diffraction orders can be continuously tuned by changing the relative phase difference between two excitation waves, enabling coherent control, with added benefits of enhanced efficiency and bandwidth. This concept is demonstrated for a thin electric metagrating operating at terahertz frequencies, showing that coherent control can overcome several of the limitations of single‐layer ultrathin metastructures, and extend their feasibility in various practical scenarios.
In:
volume:32
In:
number:36
In:
year:2020
In:
extent:6
In:
Advanced materials, Weinheim : Wiley-VCH, 1989-, 32, Heft 36 (2020) (gesamt 6), 1521-4095
Language:
English
DOI:
10.1002/adma.202002341
URN:
urn:nbn:de:101:1-2022061211503341387544
URL:
https://doi.org/10.1002/adma.202002341
URL:
https://nbn-resolving.org/urn:nbn:de:101:1-2022061211503341387544
URL:
https://d-nb.info/125970842X/34
URL:
https://doi.org/10.1002/adma.202002341
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