Abstract
Dynamic control transmission and polarization properties of electromagnetic (EM) wave propagation is investigated using chemical reconfigurable all-dielectric metasurface. The metasurface is composed of cross-shaped periodical teflon tubes and inner filled chemical systems (i.e., mixtures and chemical reaction) in aqueous solution. By tuning the complex permittivity of chemical systems, the reconfigurable metasurface can be easily achieved. The transmission properties of different incident polarized waves (i.e., linear and circular polarization) were simulated and experimentally measured for static ethanol solution as volume ratio changed. Both results indicated this metasurface can serve as either tunable FSS (Frequency Selective Surface) or tunable linear-to-circular/cross Polarization Converter at required frequency range. Based on the reconfigurable laws obtained from static solutions, we developed a dynamic dielectric system and researched a typical chemical reaction with time-varying permittivity filled in the tubes experimentally. It provides new ways for realizing automatic reconfiguration of metasurface by chemical reaction system with given variation laws of permittivity.
Highlights
All-dielectric metamaterials were emerged as alternatives for constructing NRIM (Negative refractive index media) due to their advantages in low loss and symmetric design towards lossy metal-based structure
We proposed and fabricated reconfigurable all-dielectric metasurface consisting of cross-shaped periodic teflon tubes based on mixture solution or chemical reaction
The numerical simulations and experimental measurements proved that either linear polarization or circular polarization wave can be modulated by tuning the complex permittivity of chemical systems
Summary
All-dielectric metamaterials were emerged as alternatives for constructing NRIM (Negative refractive index media) due to their advantages in low loss and symmetric design towards lossy metal-based structure Their two dimensional analogues-metasurfaces were always used for adjusting the operating frequencies, transmissions and polarizations of EM wave. With the development of all-dielectric metamaterials, tunable or reconfigurable methods were further proposed and realized toward high-frequency applications in terahertz[18, 19], infrared[20, 21] and even optical regions[22]. Tunability was provided by the gravity force, which readily reshaped the water volume in each elementary reservoir with rotation of the whole system of the meta-atoms In such configuration, the water-based metamaterials can be definitely considered as the simplest and potentially the cheapest realization of a tunable transmission of EM waves. Its tunable range is limited to the rotated angle of 90° and it is not applicable for high-efficiency cross-polarization wave conversions, as well as for linear-to-circular polarization wave conversions
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