Xing Xiaohua, Li Yanfeng, Lu Yongchang, Zhang Wentao, Zhang Xixiang, Han Jiaguang, Zhang Weili
Opt Express. 2019 Sep 30;27(20):A1627-A1635. doi: 10.1364/OE.27.0A1627.
Terahertz waves have attracted considerable research interest in recent years because of their potential applications in diverse fields. As an important device to control terahertz waves, beam splitters with greater flexibility and higher degrees of freedom are highly desirable. In order to obtain higher degrees of freedom in beam splitting, 2-bit or higher-bit coding elements are usually introduced into metamaterial beam splitters based on the coding theory. In this work, a new "offset" coding scheme using only the 1-bit coding elements of "0" and "1" is presented, and the period of coding for beam splitting can be a non-integer multiple of the length of a single unit rather than only its integer multiples. Therefore, more beam-splitting degrees of freedom can be obtained, and the design strategy is experimentally verified. We believe that the new coding scheme will also be of significance in radar cross section reduction and flexible wave control.
近年来，太赫兹波因其在不同领域的潜在应用而引起了相当大的研究兴趣。作为控制太赫兹波的重要器件，具有更高灵活性和更高自由度的分束器是非常理想的。为了在分束中获得更高的自由度，基于编码理论，通常会将2位或更高位的编码元件引入到超材料分束器中。在这项工作中，提出了一种仅使用“0”和“1”的1位编码元件的新“偏移”编码方案，并且分束的编码周期可以是单个单元长度的非整数倍，而不仅仅是其整数倍。因此，可以获得更多的分束自由度，并且该设计策略得到了实验验证。我们相信，新的编码方案在雷达散射截面缩减和灵活的波控制方面也将具有重要意义。
