Amplifying mirrors for terahertz plasmons
Amplifying mirrors for terahertz plasmons
复制标题
太赫兹等离子体激元放大镜
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
L. Solymar
中科院分区：
文献类型：
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作者：
O. Sydoruk;R. Syms;L. Solymar
半导体等离子体激元长期以来一直致力于太赫兹的产生，但竞争性的等离子体激元机制尚未发现。在这里，我们介绍放大太赫兹镜：二维电子通道的平面界面，在电子漂移的情况下放大等离子体激元。在现有的配方相比，我们开发了一个严格的模式匹配技术，考虑到完整的模式谱。反射镜的特征在于等离子体反射和透射系数，其值可以随着漂移而增加。确定振幅和功率系数，并找到其值超过1的条件。基于不同组合的放大镜的谐振腔进行了研究，并确定了一个非对称配置（由两个不同的电子通道之间的导电平面限制），其往返增益可以超过单位。振荡所需的不寻常的条件进行了详细研究，并强调了非对称安排的一般优势。最后，模式匹配作为一个通用的工具等离子体的潜力进行了讨论。
Semiconductor plasmons have long held out a promise for terahertz generation, but competitive plasmonic mechanisms have yet to be found. Here, we introduce amplifying terahertz mirrors: planar interfaces for two-dimensional electron channels that amplify plasmons in the presence of electron drift. In contrast to existing formulations, we develop a rigorous mode matching technique that takes the complete mode spectrum into account. Mirrors are characterized by plasmon reflection and transmission coefficients whose values can increase with drift. Amplitude and power coefficients are determined, and conditions are found for their values to exceed unity. Resonators based on different combinations of amplifying mirrors are investigated, and an asymmetric configuration (consisting of two different electron channels confined between conducting planes) whose roundtrip gain can exceed unity is identified. The unusual conditions needed for oscillation are examined in detail and the general advantages of asymmetric arrangements are highlighted. Finally, the potential of mode matching as a universal tool for plasmonics is discussed.