超材料
圆二色性
等离子体子
石墨烯
太赫兹辐射
费米能量
材料科学
手性(物理)
光子超材料
调制(音乐)
凝聚态物理
光电子学
物理
纳米技术
量子力学
对称性破坏
化学
结晶学
声学
Nambu–Jona Lasinio模型
电子
手征对称破缺
作者
Tian Ma,Wei Sang,Jiangkun Tian,Liyun Ma,Lei Ma,Jun Li
摘要
Active control of chirality in plasmonic metamaterials is of great importance due to their potential for diverse applications in imaging, communication and spectroscopy. Recently, inspired by the concept of bound states in the continuum (BIC), strong chiroptical responses are constructed in metamaterials by introducing structural asymmetries. However, most of these chiral metamaterials are static and cannot be modulated. Herein, we theoretically demonstrate a novel approach for manipulating chiroptical responses with enhanced circular dichroism (CD) and large modulation depths in a graphene-metal hybridized metamaterial. By introducing a structured graphene and adjusting the Fermi energy (EF), the conversion between BIC and quasi-BIC states is achieved successfully. The proposed device demonstrates a tuneable CD in the range of 0.693-0.008 when EF is adjusted from 0.01 eV to 1.0 eV, which can be further improved by optimizing its geometry. The proposed graphene-metal hybridized metamaterial paves a new way for manipulating polarization states at terahertz frequencies and is of great potential for practical applications such as dynamic display and optoelectronic modulation.
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