Wang Jing, Tian Hao, Wang Yu, Li Xueyan, Cao Yujie, Li Li, Liu Jianlong, Zhou Zhongxiang
Opt Express. 2018 Mar 5;26(5):5769-5776. doi: 10.1364/OE.26.005769.
An electrically tunable terahertz (THz) modulator with large modulation depth and low insertion loss is performed with liquid crystal (LC) metamaterial. The modulation depth beyond 90% and insertion loss below 0.5 dB are achievable at normal incidence by exploiting plasmon-induced transparency (PIT) effect. The PIT spectra can be manipulated by actively controlling the interference between dipole mode and nonlocal surface-Bloch mode with LC. The incident angle tuning effect on PIT spectra shows that the large modulation depth and low insertion loss can remain over a wide range of working angles. The superior property and simplicity of design make this modulator promising in advanced terahertz communication.
一种具有大调制深度和低插入损耗的电可调太赫兹（THz）调制器是利用液晶（LC）超材料实现的。通过利用等离子体诱导透明（PIT）效应，在垂直入射时可实现超过90%的调制深度和低于0.5 dB的插入损耗。通过用液晶主动控制偶极子模式和非局域表面布洛赫模式之间的干涉，可以操纵PIT光谱。对PIT光谱的入射角调谐效应表明，在很宽的工作角度范围内都能保持大调制深度和低插入损耗。这种调制器优越的性能和设计的简单性使其在先进的太赫兹通信中具有广阔前景。
