Journal
ADVANCED MATERIALS
Volume 32, Issue 36, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202002341
Keywords
coherent control; diffraction; metagratings; terahertz
Categories
Funding
- Air Force Office of Scientific Research
- Department of Defense
- National Science Foundation
- Simons Foundation
- National Natural Science Foundation of China [61605143, 61735012, 61705167, 61875150, 61935015, 11974259]
- Tianjin Municipal Fund for Distinguished Young Scholars [18JCJQJC45600]
Ask authors/readers for more resources
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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available