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首页> 外文期刊>Optics Communications: A Journal Devoted to the Rapid Publication of Short Contributions in the Field of Optics and Interaction of Light with Matter >Improving the efficiency and directivity of THz photoconductive antennas by using a defective photonic crystal substrate
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Improving the efficiency and directivity of THz photoconductive antennas by using a defective photonic crystal substrate

机译：使用缺陷的光子晶体基板提高THz光电导通天线的效率和方向性

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摘要

AbstractOne of the shortcomings of photoconductive (PC) antennas in terahertz (THz) generation is low effective radiated power in the desirable direction. In this paper, we propose a defective photonic crystal (DPC) substrate consisting of a customized 2D array of air holes drilled into a solid substrate in order to improve the radiation characteristics of THz PC antennas. The effect of the proposed structure on the performance of a conventional THz PC antenna has been examined from several aspects including radiation efficiency, directivity, and field distribution. By comparing the radiation performance of the THz antenna on the proposed DPC substrate to that of the conventional solid substrate, it is shown that the proposed technique can significantly improve the efficiency and directivity of the THz PC antenna over a wide frequency range. It is achieved by reducing the amount of power coupled to the substrate surface waves and limiting the radiation in undesirable directions. In addition, it is found that the sensitivity of directivity to the substrate thickness is considerably decreased and the adverse Fabry–Perot effects of the thick substrate are reduced by the application of the proposed DPC substrate.]]>
机译：<！[cdata [ 抽象 Terahertz（THz）生成中的光电导（PC）天线的缺点之一是理想方向的低有效辐射功率。在本文中，我们提出了一种缺陷的光子晶体（DPC）基板，其由钻入固体基板的定制的2D空穴的空气孔组成，以便改善THZ PC天线的辐射特性。所提出的结构对传统THz PC天线的性能的影响已经从包括辐射效率，方向性和场分布的若干方面进行了检查。通过比较所提出的DPC基板于传统固体基材上的太赫兹天线的辐射性能，它被示出，所提出的技术可以提高显著太赫兹PC天线的在很宽的频率范围内的效率和方向性。通过减少耦合到基板表面波的功率和限制不希望的方向上的辐射来实现的。此外，发现方向性的基板厚度是显着降低和厚基片的不良的法布里 - 珀罗效应的灵敏度是由所提出的DPC基板的应用减少 ]]>

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