Zeng Hongxin, Cong Xuan, Zhang Huifang, Gong Sen, Zhou Tianchi, Wang Lan, Cao Haoyi, Liang Huajie, Liang Shixiong, Wang Shiqi, Lan Feng, Wang Xun, Yang Ziqiang, Zhang Yaxin, Cui Tie Jun
School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, China.
Engineering Center of Integrated Optoelectronic & Radio Meta-chips, Chengdu 610054, China.
Sci Adv. 2024 Dec 6;10(49):eadr1448. doi: 10.1126/sciadv.adr1448. Epub 2024 Dec 4.
High-speed logic modulation of terahertz (THz) waves is crucial for future communications, yet a technology gap persists. Here, we report a dual gate-controlled two-dimensional electronic gas logic modulation metasurface that enables symmetric and asymmetric electron distribution states through independent control of the two electron transport channels. The transition between these two states leads to various response modes in the metasurface and notably increases the diversity of the spectrum transformation, resulting in a multivalued relationship in which each output corresponds to more than one input signal, thus establishing the logical modulation. Our results demonstrate the common logical functions of AND, OR, XOR, XNOR, NOR, and NAND at different frequencies with a modulation speed faster than 250 picoseconds. This work offers a unique avenue for the high-speed, free-space logical operation of THz waves and increases the security of secure communication.
太赫兹（THz）波的高速逻辑调制对未来通信至关重要，但技术差距仍然存在。在此，我们报告了一种双栅控二维电子气逻辑调制超表面，它通过独立控制两个电子传输通道实现对称和不对称电子分布状态。这两种状态之间的转变导致超表面中的各种响应模式，并显著增加了频谱变换的多样性，从而产生一种多值关系，其中每个输出对应多个输入信号，进而建立了逻辑调制。我们的结果表明，在不同频率下，与、或、异或、同或、或非和与非等常见逻辑功能以高于250皮秒的调制速度得以实现。这项工作为太赫兹波的高速自由空间逻辑运算提供了一条独特途径，并增强了安全通信的安全性。
