Danila Octavian, Manaila-Maximean Doina
Physics Department, 'Politehnica' University of Bucharest, 060042 Bucharest, Romania.
Materials (Basel). 2021 Apr 25;14(9):2201. doi: 10.3390/ma14092201.
We report the possibility of achieving normal-incidence transmission at non-normal incidence angles using thin interfaces made of metasurface structures with an appropriately-designed positive spatial phase distributions. The reported effect represents a consequence of generalized reflection and refraction, which, although having been studied for discovering exotic effects such as negative refraction, to the best of our knowledge fails to address normal incidence conditions in positive phase distribution and its underlying consequences. Normal-incidence conditions can be angle-tuned by modifying the vales of the phase distribution gradients. Furthermore, for configurations around the normal-incidence angles, the metasurface will exhibit a bifunctional behavior-either divergent or convergent. All these properties are essential for applications such as optical guiding in integrated optics, wave front sensing devices, polarization controllers, wave front-to-polarization converters, holographic sensors, and spatially-resolved polarization measurement.
我们报告了利用具有适当设计的正空间相位分布的超表面结构制成的薄界面，在非正入射角度实现正入射传输的可能性。所报道的效应是广义反射和折射的结果，尽管人们已经对其进行了研究以发现诸如负折射等奇异效应，但据我们所知，尚未涉及正相位分布中的正入射条件及其潜在后果。正入射条件可以通过修改相位分布梯度的值来进行角度调整。此外，对于正入射角度附近的配置，超表面将表现出双功能行为——发散或会聚。所有这些特性对于集成光学中的光导、波前传感装置、偏振控制器、波前到偏振转换器、全息传感器以及空间分辨偏振测量等应用至关重要。
