太赫兹辐射
振幅
束缚态
调幅
极化(电化学)
光学
物理
光子学
硅
调制(音乐)
光电子学
频率调制
量子力学
电信
无线电频率
计算机科学
化学
声学
物理化学
作者
Jitao Li,Jie Li,Chenglong Zheng,Zhen Yue,Dingyu Yang,Silei Wang,Mengyao Li,Yating Zhang,Jianquan Yao
摘要
The bound states in a continuum (BICs) are objective physical phenomena that defy conventional wisdom, and they exist in the radiating continuous spectrum but remain perfectly localized with non-radiation, which is different from the traditional bound states. In this paper, we report in theory and experiment the high thickness all-silicon terahertz (THz) metasurfaces supporting BIC and quasi-BIC, which is realized by simple pairs of elliptical pillars. Meanwhile, we used an extra optical pump to modulate the transmission amplitude difference between BIC and quasi-BIC metasurfaces, to complete the active control from “On” state to “Off” state. We utilize the abundant amplitude gradation of metasurfaces with different asymmetric degrees to develop the polarization-dependent THz near-field displaying application that can make the grayscale characteristics of a photograph reappear and also be dynamically controlled at On state to Off state.
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