Terahertz beam focusing based on plasmonic waveguide scattering
Terahertz beam focusing based on plasmonic waveguide scattering
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DOI：
10.1063/1.4759042
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发表时间：
2012-10
影响因子：
4
通讯作者：
Y. Monnai;K. Altmann;C. Jansen;M. Koch;H. Hillmer;H. Shinoda
中科院分区：
文献类型：
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作者：
Y. Monnai;K. Altmann;C. Jansen;M. Koch;H. Hillmer;H. Shinoda
我们展示了太赫兹（THz）辐射的自由空间聚焦散射等离子体表面波到空气中。我们使用的光栅的浅孔，其中包含非等距缺陷作为散射中心。散射以限定的相位延迟发生，使得在自由空间中发射的波相长干涉以在波导表面上方形成焦点。与传统的透镜相比，这种结构不需要在其背面上的任何自由空间，并且具有集成THz光学的巨大潜力。
We demonstrate free-space focusing of terahertz (THz) radiation by scattering plasmonic surface-waves into the air. We use a grating of shallow holes which contains non-equidistant defects which act as scattering centers. The scattering occurs with defined phase delays such that the waves emitted in free-space interfere constructively to form a focus above the waveguide surface. In contrast to conventional lenses, this structure does not require any free-space on its backside and has great potential for integrated THz optics.