Directional terahertz radiation through groove-assisted hole array

Directional terahertz radiation through groove-assisted hole array
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通过凹槽辅助孔阵列定向太赫兹辐射

DOI:
10.1007/s00340-008-3141-0
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发表时间:
2008-08
影响因子:
2.1
通讯作者:
Du, C.
Du, C.
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Luo, X.;Cui, J.;Gan, D.;Shi, H.;Ma, J.;Liu, Y.;Du, C.

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作者从理论上证明了通过同心周期性凹槽包围的金属亚波长孔阵列进行太赫兹光束整形。组合结构中表面波的谐振激发可以同时获得高透射率和定向辐射。时域有限差分仿真结果表明,透射率主要取决于孔阵列的晶格常数及其周围入射面的特征,而远场角分布则由输出面的细节决定。这种紧凑的光束整形结构有望成为未来太赫兹系统的基本器件。
The authors theoretically demonstrate the terahertz beam shaping with metallic subwavelength holes array surrounded by concentric periodic grooves. High transmission and directional radiation can be obtained simultaneously for the resonant excitation of the surface wave in the combined structure. Finite-difference time-domain simulation results shows that the transmission mainly depends on the lattice constant of hole array and the features of incident surface around it, while the far-field angle distribution is dominated by the details of the output surface. This compact beam shaping structure is hoped to serve as a basic device for future terahertz systems.
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