Asymmetric phase anomaly of terajet generated from dielectric cube under oblique illumination
Asymmetric phase anomaly of terajet generated from dielectric cube under oblique illumination
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DOI：
10.1063/1.4983640
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发表时间：
2017-05-15
影响因子：
4
通讯作者：
Minin, Igor V.
中科院分区：
文献类型：
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作者：
Hai Huy Nguyen Pham;Hisatake, Shintaro;Minin, Igor V.
太赫兹（THz，0.1-10 THz）区域的射流，由于其能够将光束压缩到亚波长热点而吸引了相当大的研究兴趣。在这里，我们报告了一个异常的非对称古伊相位异常的发现，在terajet产生的特氟龙（n = 1.46）立方体照射的TM模式斜入射。这种不对称的古伊相位异常导致古伊相位异常的相位分布的法线与生成terajet的位置处的入射光束的传播方向之间的有趣的偏离角。当太赫兹波在几个波长上传播时，该偏离角呈指数减小。产生的terajet的输出角，这是评估的基础上的振幅分布的实验峰值，显示出线性，是相同的入射光束的输入角。对于倾斜照明的宽角度（45度），半峰全宽也保持在波长内。出版社：AIP Publishing
The terajet, a jet in the terahertz (THz, 0.1-10 THz) region, has attracted considerable research interest owing to its capability to compress beams to subwavelength hotspots. Here, we report a finding of an abnormal asymmetric Gouy phase anomaly in a terajet generated from a Teflon (n = 1.46) cube illuminated by the TM-mode oblique incidences. This asymmetric Gouy phase anomaly causes an interesting deviation angle between the normal of the phase distribution of the Gouy phase anomaly and the propagation direction of the incident beam at the position where the terajet is generated. This deviation angle exponentially decreases as THz waves propagate over several wavelengths. The output angle of the generated terajet, which is evaluated based on the experimental peak values of the amplitude distribution, shows linearity and is identical to the input angle of the incident beam. The full width at half maximum is also maintained within a wavelength for wide angles (45 degrees) of oblique illuminations. Published by AIP Publishing.