Abstract
We present a multifunctional metasurface by using phase change material of GeTe. Under different external temperature, the proposed metasurface achieves various terahertz device functions including single-band terahertz absorption, tri-band terahertz absorption and double-band electromagnetic induced transparency (EIT). When the bottom GeTe layer is crystalline (i.e. the external temperature t=250 °C), the presented metasurface can be used as a terahertz wave absorber with tri-absorption bands. The three absorption peaks for TE incident wave are 96.3% at 0.46 THz, 95.7% at 0.74 THz and 99.7% at 1.27 THz, respectively. As the top GeTe is crystalline state (i.e. the external temperature t=250 °C), the presented metasurface becomes a terahertz wave absorber with a single absorption peak of 99.2% at 0.6 THz. When the top and bottom GeTe are amorphous state (i.e. the external temperature t=25 °C), our designed metasurface can be switched from terahertz absorption to electromagnetically induced transparency. This multifunctional switching metasurface structure provides a new method for the design of terahertz wave devices.
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