Terahertz Multi-beam Modulation Reflection-coding Metasurface Inspired by Chinese Ancient Copper Coins
With the continuous deepening of research,the importance of terahertz devices in various fields of basic research and engineering applications is becoming increasingly prominent.However,these devices generally only work at a single frequency and are sensitive to circular polarization.In order to overcome this limitation,with inspiration from ancient Chinese copper coins,a multi-frequency terahertz coding metasurface is designed.This structure is composed of cells"0"and"1".A 1-bit terahertz metasurface constructed by phase coding can achieve different beam splitting functions at three frequencies under x-linear polarization and circular polarization wave incidence,respectively.Furthermore,by changing the radius of the 1-bit coding metasurface,a 2-bit terahertz coding metasurface can be constructed to achieve beam deflection functionality.Additionally,utilizing amplitude differences,amplitude coding metasurfaces can be constructed to achieve spatial imaging capabilities under x-linear polarization and circular polarization wave incidence.The designed metasurfaces not only solve the limitations of using only phase or amplitude coding for terahertz wavefront manipulation,but also overcome the drawbacks that the conventional devices can only operate at a single frequency and are sensitive to circular polarization waves.These advancements provide tremendous potential for applications in terahertz communication.
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