编码(社会科学)
计算机科学
传输(电信)
信息传输
点(几何)
点对点
空格(标点符号)
对偶(语法数字)
电信
数学
计算机网络
几何学
统计
操作系统
文学类
艺术
作者
Xiaohang He,Chenxia Li,Bo Fang,Ying Tian,Liang Chen,Zhi Hong,Xufeng Jing
出处
期刊:Journal of The Optical Society of America B-optical Physics
[Optica Publishing Group]
日期:2024-07-02
卷期号:41 (11): D15-D15
被引量:2
摘要
Space-time coding (STC) digital metasurfaces enable dynamic control of nonlinear harmonics. To achieve efficient frequency tuning and harmonic control, we propose a one-bit column-controlled temporal coding dual-frequency point STC digital metasurface. Using a field-programmable gate array (FPGA) to control diode switching, the metasurface is encoded to generate multiple target reflected harmonics as independent information transmission channels. The amplitude intensities of these harmonics are defined as independent binary symbols for transmission. The proposed space-time coding digital metasurface can achieve a phase shift of 180° in its unit structure, with reflectivities above 90% at both operating frequencies. We fabricated the designed metasurface and tested its far-field scattering experimentally. When the incident electromagnetic wave frequency is 4.63 GHz, the predicted results are essentially consistent with the experimental findings.
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