Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 30, Issue 4, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201906851
Keywords
all-dielectric; membranes; metasurfaces; Mie resonance; terahertz
Categories
Funding
- Australian Research Council [FT160100153]
- Australian National University
- Singapore Ministry of Education AcRF [RG191/17]
- Russian Science Foundation [18-72-10140]
- Russian Science Foundation [18-72-10140] Funding Source: Russian Science Foundation
- Australian Research Council [FT160100153] Funding Source: Australian Research Council
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All-dielectric metasurfaces have become a new paradigm for flat optics as they allow flexible engineering of the electromagnetic space of propagating waves. Such metasurfaces are usually composed of individual subwavelength elements embedded into a host medium or placed on a substrate, which often diminishes the quality of the resonances. The substrate imposes limitations on the metasurface functionalities, especially for infrared and terahertz frequencies. Here a novel concept of membrane Huygens' metasurfaces is introduced. The metasurfaces feature an inverted design, and they consist of arrays of holes made in a thin membrane of high-index dielectric material, with the response governed by the electric and magnetic Mie resonances excited within dielectric domains of the membrane. Highly efficient transmission combined with the 2 pi phase coverage in the freestanding membranes is demonstrated. Several functional metadevices for wavefront control are designed, including beam deflector, a lens, and an axicon. Such membrane metasurfaces provide novel opportunities for efficient large-area metadevices, whose advanced functionality is defined by structuring rather than by chemical composition.
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