Abstract
Functional devices based on electromagnetic (EM) tunable metasurfaces provide a feasible strategy for controlling of communication signals. Here, an EM metasurfaces based on Ge2Sb2Te5 (GST) layer is proposed and verified. At room temperature, this metasurface sample obtains a transmission window (resonant frequency 8.07 GHz, amplitude 0.92) based on the amorphous state of the GST layer. This transmission window is frequency selectable, which is achieved by changing the structural parameters (diameter of hole array, or thickness of dielectric layer). By changing the annealing temperature, this transmission window is always covered by the transmission valley, thus confirming the switchability of the metasurface sample. Finally, the sensitivity of the transmission window of this metasurface sample to liquid (water, acetone, ethanol, and PEG300) is measured and verified. The metasurface can be applied in communication, sensing, control and other fields.
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