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High-performance meta-devices based on multilayer meta-atoms: interplay between the number of layers and phase coverage.
- Source :
-
Science Bulletin . Jun2019, Vol. 64 Issue 12, p823-835. 13p. - Publication Year :
- 2019
-
Abstract
- Transmissive metasurfaces have provided an efficient platform to manipulate electromagnetic (EM) waves, but previously adopted multilayer meta-atoms are too thick and/or the design approach fully relies on brute-force simulations without physical understandings. Here, based on coupled-mode theory (CMT) analyses on multilayer meta-atoms of distinct types, it is found that meta-atoms of a specific type only allows the phase coverage over a particular range, thus suitable for polarization-control applications. However, combinations of meta-atoms with distinct types are necessary for building ultra-thin wavefront-control meta-devices requiring 360° phase coverage. Based on these physical understandings, high-efficiency meta-atoms are designed/fabricated, and used to construct three typical meta-devices, including quarter- and half-wave plates and a beam deflector. Our results elucidate the physics underlying the interplay between thicknesses and performances of transmissive metasurfaces, which can guide the realizations of miniaturized transmissive meta-devices in different frequency domains. [ABSTRACT FROM AUTHOR]
- Subjects :
- *LAMB waves
*ELECTROMAGNETIC spectrum
Subjects
Details
- Language :
- English
- ISSN :
- 20959273
- Volume :
- 64
- Issue :
- 12
- Database :
- Academic Search Index
- Journal :
- Science Bulletin
- Publication Type :
- Academic Journal
- Accession number :
- 137211948
- Full Text :
- https://doi.org/10.1016/j.scib.2019.05.028