Terahertz wave enhanced transmission through a single subwavelength aperture with periodic surface structures
Terahertz wave enhanced transmission through a single subwavelength aperture with periodic surface structures
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DOI：
10.1143/jjap.44.l1005
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发表时间：
2005-01-01
期刊：
影响因子：
--
通讯作者：
Ohashi, K
中科院分区：
文献类型：
--
作者：
Ishihara, K;Hatakoshi, G;Ohashi, K
我们演示了通过靶眼结构（金属板上由同心周期凹槽包围的单个亚波长孔径）共振增强的太赫兹（THz）波辐射（gimel类似于200 μ m）传输。这种现象是由同心周期槽产生的表面波的共振激发引起的，表面波被称为光学区表面等离子激元极化子。通过单个亚波长圆形孔径（直径= 100 μ m），观察到太赫兹辐射的透射增强。我们还表明，在牛眼结构中引入布拉格反射镜可以进一步提高增强透射率。
We demonstrate resonantly enhanced transmission of terahertz (THz) wave radiation (gimel similar to 200 mu m) through a bull's eye structure (a single subwavelength aperture surrounded by concentric periodic grooves in a metal plate). The phenomenon is caused by the resonant excitation of surface waves, which are known as surface plasmon polaritons in the optical region, generated by the concentric periodic grooves. Strongly enhanced transmission of THz-wave radiation is observed through the single subwavelength circular aperture (diameterd = 100 mu m). We also show that introducing the Bragg reflector to the bull's eye structure results in the further increase of the enhanced transmission.