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Composite Multilayer Shared-Aperture Nanostructures: A Functional Multispectral Control
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DOI：10.1021/acsphotonics.7b01441.png)
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There is a growing demand in the field of metasurfaces to design and implement functional multispectral devices capable of complex beam conversion and high-capacity optical information processing. Control over the size of the aperture footprint, fabrication complexity, and fundamental cross-talk poses great challenges toward the realization of these multifunctional multispectral optical devices. Here, we demonstrate a systematic design strategy and a full roadmap toward implementation of a novel class of nanoantenna arrays based on the multilayer shared-aperture concept, which can simultaneously multiplex multiwavelengths into a single optical device platform. The idea is supported by engineering two dual-layer metasurface-based designs with the capability of superdistinct operating channels (lying in the thermal infrared and visible spectra) and superclose operating channels (both lying in the visible spectrum) to simultaneously and independently perform anomalous or similar wavefront manipulation at two predesigned wavelengths. We leverage transparent conducting oxide (TCO)-dielectric and plasmonic dielectric composite multilayer nanostructures to realize the aforementioned designs, respectively. The challenges such as coupling effects among the different wavelengths, compactness, fabrication feasibility, and material frequency dispersion are thoroughly addressed by careful selection of constituent materials and geometrical shape of resonators, array architecture, and optimization of structural parameters of inclusions. As a proof of concept, we have designed two dual-wavelength holographic metalenses generating images located in-plane and out-of-plane at two selected wavelengths. The proposed technique is in particular of interest in the fields of data storage, information processing, and displays.
Keyword:
metasurfaces
shared-aperture antennas
multifunction
multispectral
metahologram
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