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Metasurface-Based Ultrathin Beam Splitter with Variable Split Angle and Power Distribution
ACS Photonics ( IF 7 ) Pub Date : 2018-07-13 00:00:00 , DOI: 10.1021/acsphotonics.8b00626
Xingliang Zhang 1 , Ruyuan Deng 1 , Fan Yang 1 , Chunping Jiang 2 , Shenheng Xu 1 , Maokun Li 1
Affiliation  

Metasurfaces are artificial electromagnetic surfaces that consist of subwavelength scatterers in an array configuration, exhibiting exceptional abilities to manipulate electromagnetic waves. Based on the metasurface concept, a novel beam splitter for a single-frequency same-polarization light is proposed in the visible spectrum. Using metal–dielectric–metal (MDM) scattering unit cells, an array of the circular gold nanocylinders with two different diameters is designed and fabricated on the surface which introduces phase discontinuity on the scattering wavefronts. At 240 nm thick, the flat beam splitter can efficiently reflect an incident wave toward two predesigned directions. More importantly, the split angle and power distribution between these two beams can be readily controlled by setting a proper incident angle. Compared to conventional bulky optical components, the ability of this metasurface-based beam splitter would be very desirable in integrated optical systems.

中文翻译:

变分角和功率分布的基于超表面的超薄分束器

超表面是由阵列形式的亚波长散射体组成的人造电磁表面,具有超强的电磁波处理能力。基于超表面概念,提出了一种在可见光谱中用于单频同偏振光的新型分束器。使用金属-电介质-金属(MDM)散射晶胞,在表面上设计并制造了具有两个不同直径的圆形金纳米圆柱阵列,这在散射波阵面上引入了相位不连续性。平板分束器的厚度为240 nm,可以有效地向两个预先设计的方向反射入射波。更重要的是,通过设置适当的入射角,可以容易地控制这两个光束之间的分离角和功率分布。
更新日期:2018-07-13
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