School of Electrical Engineering and Computer Science, Gwangju Institute of Science and Technology, Cheomdan-gwagiro 123, Gwangju 61005, South Korea.
Electrical Environment Research Center, Korea Electrotechnology Research Institute (KERI), 12, Bulmosan-ro 10Beon-gil, Changwon 51543, South Korea.
Sci Rep. 2017 Feb 17;7:42952. doi: 10.1038/srep42952.
A terahertz (THz) in-line polarization converter that yields a polarization conversion ratio as high as 99.9% is demonstrated at 1 THz. It has double-layer slot structures oriented in orthogonal directions that are electrically connected by 1/8-wavelngth-long through-via holes beside the slot structures. The slots on the front metal-plane respond to the incident THz wave with polarization orthogonal to the slots and generates a circulating surface current around the slots. The surface current propagates along a pair of through-via holes that function as a two-wire transmission line. The propagating current generates a surface current around the backside slot structures oriented orthogonal to the slot structures on the front metal layer. The circulating current generates a terahertz wave polarized orthogonal to the backside slot structures and the 90° polarization conversion is completed. The re-radiating THz wave with 90° converted polarization propagates in the same direction as the incident THz wave.
在 1THz 频率下，演示了一种太赫兹（THz）线偏振转换器，其偏振转换比高达 99.9%。它具有双层插槽结构，这些插槽结构彼此正交取向，并通过插槽旁边的 1/8 波长长贯穿通孔电连接。前金属平面上的插槽以与插槽正交的偏振响应入射太赫兹波，并在插槽周围产生环形表面电流。表面电流沿着一对用作双线传输线的贯穿通孔传播。传播电流在前金属层的插槽结构周围产生与背面插槽结构正交的表面电流。环形电流产生与背面插槽结构正交偏振的太赫兹波，从而完成 90°的偏振转换。具有 90°转换偏振的再辐射太赫兹波以与入射太赫兹波相同的方向传播。
