Based on SrTiO 3 (STO) elliptical metamaterials (MMs) structures, the tunable propagation properties have been systematically investigated in the THz regime, including the effects of temperatures, incident angles, operation frequencies, and graphene Fermi levels. The results reveal that STO MMs manifest excellent thermally tunable properties, e.g. the amplitude and frequencies modulation depths are larger than 95.3% and 21.8% if temperature varies in the range of 70–320 K. The incident angles affect the resonant curves significantly, the amplitude modulation depth approximates 90% by changing the polarization angles, and the Q -factor reaches more than 20. The tunable Fano resonances can be achieved by utilizing a symmetrical STO-graphene structure. If the graphene Fermi level changes in the range of 0.3–1.0 eV, the amplitude modulation depth of transmission curve is more than 80%. The results are very helpful to understand the resonant mechanisms of ferroelectri...

中文翻译：

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可调谐钛酸锶太赫兹全介电超材料

基于SrTiO 3（STO）椭圆形超材料（MMs）结构，已在THz范围内系统地研究了可调传播特性，包括温度，入射角，工作频率和石墨烯费米能级的影响。结果表明，STO MM具有出色的热可调性能，例如，如果温度在70–320 K范围内变化，则振幅和频率调制深度将分别大于95.3％和21.8％。入射角会显着影响共振曲线，振幅通过改变偏振角，调制深度接近90％，Q因子达到20以上。可通过使用对称的STO-石墨烯结构来实现可调谐的Fano共振。如果石墨烯费米能级在0.3–1.0 eV的范围内变化，传输曲线的调幅深度大于80％。研究结果对了解铁电的共振机理非常有帮助。