Perfect lenses, superlenses and time-reversal mirrors can support and spatially separate evanescent waves, which is the basis for detecting subwavelength information in the far field. However, the inherent limitations of these methods have prevented the development of systems to dynamically distinguish subdiffraction-limited signals. Utilizing the physical merits of spoof surface plasmon polaritons (SPPs), we demonstrate that subdiffraction-limited signals can be transmitted on planar integrated SPP channels with low loss, low channel interference, and high gain and can be radiated with a very low environmental sensitivity. Furthermore, we show how deep subdiffraction-limited signals that are spatially coupled can be distinguished after line-of-sight wireless transmission. For a visualized demonstration, we realize the high-quality wireless communication of two movies on subwavelength channels over the line of sight in real time using our plasmonic scheme, showing significant advantages over the conventional methods.

完美透镜、超透镜和时间反转镜可以支持和空间分离倏逝波，这是在远场检测亚波长信息的基础。然而，这些方法的固有局限性阻碍了动态区分亚衍射限制信号的系统的发展。利用欺骗表面等离子体激元 (SPP) 的物理优点，我们证明了亚衍射限制信号可以在平面集成 SPP 通道上传输，具有低损耗、低通道干扰和高增益，并且可以以非常低的环境敏感性进行辐射。此外，我们展示了在视线无线传输后如何区分空间耦合的深次衍射限制信号。对于可视化演示，