材料科学
谐振器
掩蔽
光学
圆极化
极化(电化学)
光电子学
太赫兹辐射
带宽(计算)
电导率
硅
超材料
物理
电信
化学
微带线
物理化学
量子力学
计算机科学
作者
Si‐yuan Liao,Zhen Qiao,Junyang Sui,Haifeng Zhang
标识
DOI:10.1002/andp.202300195
摘要
Abstract In this paper, a metastructure multifunctional device for circular‐to‐linear polarization conversion (PC) and perfect absorption is proposed in which the electrical conductivity of the silicon material is controlled by light, thus changing the function of the device. The paper also explores three methods of optimizing bandwidth and their mechanisms, which are analyzed by means of current and energy density diagrams. The unit structure of this device adopts a 2 × 2 array, which is used for differentiated reflection of circular polarization waves, and forms linear polarization waves after reflection. In the other state, ultrawideband absorption can be achieved by changing the conductivity of silicon by external optical pumping, and the bandwidth is widened by inserting air resonators. In general, the device can form a PC at 0.89–1.31 THz with a relative bandwidth of 38% when there is no illumination. The resulting linear polarization wave has an axial ratio greater than 19 dB. When the silicon is excited by light resulting in a stable conductivity of around 9000 S m −1 , the absorption band is 0.89–2.01 THz, the relative bandwidth is 77%, and the absorption rate is above 90%. This device can be used for communication, electromagnetic cloaking, and modulation.
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