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Terahertz photonic crystal fiber polarization rotator
Journal of the Optical Society of America B ( IF 1.9 ) Pub Date : 2020-09-08 , DOI: 10.1364/josab.399165
Mohamed Farhat O. Hameed , Mohamed Saleh M. Esmail , Salah S. A. Obayya

Polarization control of terahertz (THz) waves is highly required due to their immense practical applications. Most of the THz polarization rotators in the literature depend on the transmission or reflection from metamaterials or all-dielectric metasurfaces. There is also a lack of THz polarization handling waveguides due to the material absorption in this frequency regime. In this paper, a THz photonic crystal fiber (PCF) polarization rotator (PR) is introduced and analyzed for the first time to the best of our knowledge. The suggested PCF-PR has an asymmetric porous core to decrease the material losses and increase the hybridness of the two polarized modes. Therefore, high polarization conversion ratio of 80.7% is achieved with a good crosstalk of ${-}{18.9}\;{\rm dB}$ at a frequency of 1 THz along a device length of 7.9 mm. Further, the operating frequency has a tolerance of ${f} = {1} \pm{0.1}\;{\rm THz}$ where the crosstalk is still better than ${-}{15}\;{\rm dB}$.

中文翻译:

太赫兹光子晶体光纤偏振旋转器

由于太赫兹(THz)波的大量实际应用,因此非常需要对其进行偏振控制。文献中大多数THz极化旋转器取决于超材料或全电介质超表面的透射或反射。由于在该频率范围内的材料吸收,还缺少太赫兹偏振处理波导。本文中,就我们所知,首次对太赫兹光子晶体光纤(PCF)偏振旋转器(PR)进行了介绍和分析。建议的PCF-PR具有不对称的多孔核,以减少材料损失并增加两种极化模式的混合性。因此,在$ {-} {18.9} \; {\ rm dB} $的良好串扰下,实现了80.7%的高偏振转换率。沿着7.9 mm的器件长度以1 THz的频率工作。此外,工作频率的容差为$ {f} = {1} \ pm {0.1} \; {\ rm THz} $,而串扰仍优于$ {-} {15} \; {\ rm dB } $
更新日期:2020-10-02
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