Wang Jiang, Wu Wen
Opt Express. 2017 Feb 20;25(4):3805-3810. doi: 10.1364/OE.25.003805.
This paper presents a polarization converter to convert a linearly polarized (LP) incident wave into an outgoing circularly polarized (CP) wave. It is constructed by a 2D array of thin cavities, with each cavity etched with three slots. The front slot is used to couple the LP wave into the cavity, while the backside orthogonal slots are utilized to couple the field out of the cavity with the same amplitude and 90° out-of-phase; subsequently, a CP wave is formed at the other side of the converter. As a proof-of-concept, a sample of the proposed converter is fabricated and measured in the microwave regime. Eventually, a perfect CP wave is demonstrated after the LP wave passes through the converter. The proposed linear-to-circular polarization converter features an extremely low insertion loss of around 0.1 dB and a high polarization conversion efficiency of 0.97.
本文提出了一种偏振转换器，用于将线偏振（LP）入射波转换为出射圆偏振（CP）波。它由二维薄腔阵列构成，每个腔蚀刻有三个狭槽。前狭槽用于将LP波耦合到腔内，而后侧正交狭槽用于以相同幅度和90°相位差将场耦合出腔；随后，在转换器的另一侧形成CP波。作为概念验证，制作了所提出转换器的样品并在微波频段进行了测量。最终，LP波通过转换器后展示出完美的CP波。所提出的线偏振到圆偏振转换器具有极低的插入损耗，约为0.1 dB，以及0.97的高偏振转换效率。
