Bark Hyeon Sang, Jang Kyu-Ha, Lee Kitae, Jeong Young Uk, Jeon Tae-In
Electrical and Electronics Engineering, Korea Maritime and Ocean University, Busan, 49112, Republic of Korea.
Radiation Center for Ultrafast Science, Korea Atomic Energy Research Institute, Daejeon, 34057, Republic of Korea.
Sci Rep. 2021 Jan 14;11(1):1307. doi: 10.1038/s41598-020-80134-2.
In this paper, we propose a terahertz (THz) guided-mode resonance (GMR) notch filter made of a monolithic polyethylene terephthalate (PET) film, which has a monolayer grating structure. The proposed configuration shows both polarization-dependent and polarization-independent notch filter characteristics for the incident THz wave depending on the rotation angle of the second grating film. When the rotation angle is 0°, the filtering strength (transmittance) at resonance frequency changes from 0.4 (0.996) to 99.0% (0.010) according to the incident polarization. The transmittance continuously decreases with increasing rotation angle until 90°. When the rotation angle is 90°, the transmittance converges to 0.065 (± 0.015) independent of the incident wave polarization. When the incident polarization angle ranges from 90° to 180°, paradoxically, the transmittance through the two GMR grating films is greater than the transmittance through only the first GMR grating film due to the enhancement of the vertical component of the THz wave. These results agree well with a calculation using a polar coordinate system.
在本文中，我们提出了一种由具有单层光栅结构的单片聚对苯二甲酸乙二醇酯（PET）薄膜制成的太赫兹（THz）导模共振（GMR）陷波滤波器。所提出的结构根据第二光栅薄膜的旋转角度，对入射太赫兹波呈现出偏振相关和偏振无关的陷波滤波器特性。当旋转角度为0°时，共振频率处的滤波强度（透过率）根据入射偏振从0.4（0.996）变化到99.0%（0.010）。透过率随着旋转角度增加持续下降，直到90°。当旋转角度为90°时，透过率收敛到0.065（±0.015），与入射波偏振无关。当入射偏振角在90°到180°范围内时，矛盾的是，由于太赫兹波垂直分量的增强，通过两个GMR光栅薄膜的透过率大于仅通过第一个GMR光栅薄膜的透过率。这些结果与使用极坐标系的计算结果非常吻合。
