Abstract
In this paper, we have designed a metasurface based on electrically tunable Mie-type resonators and theoretically demonstrated its tunable response to electromagnetic waves with varying frequency. The metasurface consists of disk-like ferroelectric resonators arrayed on a metal film and the upper surface of resonators is covered by ion gel film which is transparent for incident electromagnetic wave. Using the metal film and ion gel film as electrodes, the permittivity of the resonators can be adjusted by an external electric field and, as a result, the reflection phase of the resonators can be dynamically adjusted in a relatively wide range. By programmable controlling the electric field strength applied on resonators of metasurface, a 2π phase ramp can be realized and, thereby, the arbitrary reflection behavior of incident waves with varied frequency is obtained. Because of the tunability, this metasurface can also be used to design adaptive metasurface lens and carpet cloak.
Highlights
Metamaterial has attracted many interests in optics community because of its ability of manipulation of electromagnetic wave[1]
The metasurface consists of disk-like barium strontium titanate (BST) ferroelectric resonators arrayed on a metal film and the upper surface of resonators is covered by ion gel film
It is composed of disk-like BST ferroelectric resonators arrayed on a metal film which can eliminate transmission
Summary
Metamaterial has attracted many interests in optics community because of its ability of manipulation of electromagnetic wave[1]. Many kinds of metasurfaces have been designed and fabricated for different functions, such as steering[2], focusing[3], total absorption[4], and so on Most of these metasurfaces are fabricated based on metallic resonators, which still have great inherent losses. The metasurfaces are composed of resonators with different geometric dimensions for providing designed local phase shift, leading to great difficulties in fabrication of large scale. All of these disadvantages limit the application of metasurface. We have proposed a metasurface based on electrically tunable Mie-type dielectric resonators, which has a tunable response to electromagnetic wave with varying frequency. We use the tunable metasurface to design adaptive metasurface lens and carpet cloak, and demonstrate their wide-angle and tunable frequency characters by programmable control of electric field strength
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