Experimental characterization of terajet generated from dielectric cuboid under different illumination conditions
Experimental characterization of terajet generated from dielectric cuboid under different illumination conditions
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DOI：
10.1109/gsmm.2017.7970306
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发表时间：
2017-05
期刊：
影响因子：
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通讯作者：
Hai Huy Nguyen Pham;S. Hisatake;T. Nagatsuma;I. Minin;O. Minin
中科院分区：
文献类型：
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作者：
Hai Huy Nguyen Pham;S. Hisatake;T. Nagatsuma;I. Minin;O. Minin
太赫兹（THz）频段（0.1 THz-10 THz）的喷流产生太赫兹喷气，由于其可在太赫兹成像应用中利用的亚波长热点，引起了人们的极大研究兴趣。迄今为止，人们已经在平面入射下研究和验证了介电立方体产生terajet的情况。在高分辨率太赫兹成像的实际应用中，必须考虑长方体的对准以及太赫兹功率的有效利用。在这里，我们实验研究了不同的倾斜和压缩入射下的terajet的产生，以验证的terajet的特性，如位置，方向，和半高宽（FWHM）的属性。我们发现，在压缩入射下可以产生terajet。在斜入射条件下，terajet的输出角是线性的，并且与入射光束的输入角相同。所产生的terajet的位置在两个波长内变化。在这些照明条件下，低于一个波长的FWHW得以维持。因此，长方体可以作为一种新型的聚焦装置，它可以通过简单地将其放置在具有灵活对准的成像系统中来提高分辨率。
The terajet, which is the generation of a jet in the terahertz (THz) frequency band (0.1 THz–10 THz), has attracted significant research interest owing to its subwavelength hotspot that can be exploited in THz imaging applications. To date, the generation of the terajet from a dielectric cuboid has been studied and verified under planar incidences. In practical applications of high-resolution THz imaging, it is essential to take into consideration the alignment of the cuboid, as well as the efficient use of the THz power. Here, we experimentally study the generation of the terajet under different oblique and compressed incidences, in order to verify the characteristics of the terajet, such as the position, direction, and full width at half maximum (FWHM) properties. We discover that the terajet can be generated under compressed incidence. The output angle of the terajet under oblique incidence is linear and identical to the input angle of the incident beam. The position of the generated terajet is varied within two wavelengths. The FWHW below one wavelength was maintained under those illumination conditions. Consequently, the cuboid can function as a novel focusing device, which can enhance the resolution by simply placing it in the imaging system with a flexible alignment.