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首页> 外文期刊>Applied optics >Influence of spatial incident angles on polarizer with a slit in grooved metal slabs for terahertz communication
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Influence of spatial incident angles on polarizer with a slit in grooved metal slabs for terahertz communication

机译：太赫兹通信中，空间入射角对带槽金属平板中带有狭缝的偏振片的影响

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We report the influence of two spatial incident angles on a terahertz polarizer, which is based on an aluminum slab with a center slit flanked by symmetrically distributed parallel grooves on both sides. Experimental results show that the polarizer shows narrow bandpass filtering effect with a very small divergence angle at normal incidence, which is very suitable for terahertz communication, and the extinction ratio (ER) can be achieved above 20 dB in the frequency band between 0.3 and 0.36 THz due to the excitation of spoof surface plasmon. As the structure rotates around the slit direction (beta), the transmission peak will split into two and degrade quickly and the ER decreased down to 20 dB for beta = 10 degrees at peak position. Rotating along grating period direction (gamma) shows better tuning performance. The tuning frequency window can reach from 0.3 to 0.36 THz to promise an ER above 20 dB as gamma is smaller than 25 degrees. (C) 2015 Optical Society of America
机译：我们报告了两个空间入射角对太赫兹偏振片的影响，太赫兹偏振片是基于一块铝板，其中心狭缝两侧是对称分布的平行凹槽。实验结果表明，该偏振片在垂直入射时显示出窄的带通滤波效果，发散角很小，非常适合太赫兹通信，在0.3和0.36之间的频段内，消光比（ER）可以达到20 dB以上由于欺骗表面等离子体激元的激发而产生的太赫兹。当结构围绕狭缝方向（β）旋转时，透射峰将分成两个峰并迅速衰减，并且在峰位置处β= 10度时ER下降至20 dB。沿光栅周期方向（gamma）旋转显示出更好的调谐性能。调谐频率窗口可以从0.3到0.36 THz，以保证ER超过20 dB，因为伽马小于25度。 （C）2015年美国眼镜学会

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