Han Tiancheng, Wu Zhengmao
Opt Lett. 2014 Jul 1;39(13):3698-701. doi: 10.1364/OL.39.003698.
We propose a novel optical transformation to design an arbitrary N-sided regular polygonal rotator, which demonstrates that the inhomogeneity of a rotator can be completely removed, and only anisotropy is needed to rotate wavefronts without any perturbance. An N-sided regular polygonal rotator will give rise to a rotation angle of 360°/N, thereby leading to a series of discrete rotation angles with different choices of N. Practical realization of such homogeneous rotators is suggested by using only four kinds of nonmagnetic isotropic dielectrics throughout. The dielectrics can be easily arranged in a planarly stratified configuration due to all the flat boundaries, which makes the rotator much easier in fabrication and application. Full-wave simulation validates the proposed scheme applicable to both passive object and active source with excellent performance.
我们提出了一种新颖的光学变换方法来设计任意 N 边正多边形旋转器，这表明旋转器的不均匀性可以完全消除，并且仅需各向异性就能在无任何干扰的情况下旋转波前。一个 N 边正多边形旋转器将产生 360°/N 的旋转角度，从而随着 N 的不同选择导致一系列离散的旋转角度。通过始终仅使用四种非磁性各向同性电介质来实现这种均匀旋转器的实际应用。由于所有边界都是平的，这些电介质可以很容易地排列成平面分层结构，这使得旋转器在制造和应用上更加容易。全波模拟验证了所提出的方案适用于无源物体和有源源，并且具有优异的性能。
