Department of Physics and Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon Tong, Kowloon, Hong Kong.
Phys Rev Lett. 2013 Jul 19;111(3):033901. doi: 10.1103/PhysRevLett.111.033901. Epub 2013 Jul 16.
We introduce a field transformation method for wave manipulation based on completely reciprocal and passive materials. While coordinate transformations in transformation optics (TO) change the size and shape of an object, field transformations give us direct control on the impedance and polarization signature of an object. Using our approach, a new type of perfect conductor can be realized to completely convert between transverse electric and transverse magnetic polarizations at any incidence angles and a perfect magnetic conductor of arbitrary shape can be mimicked by using anisotropic materials. The approach can be further combined with TO to enhance existing TO devices. For example, a dielectric cylinder can become completely transparent for both polarizations using bianisotropic materials.
我们介绍了一种基于完全互易和无源材料的波操控场变换方法。虽然变换光学中的坐标变换改变了物体的大小和形状，但场变换使我们能够直接控制物体的阻抗和极化特性。利用我们的方法，可以实现一种新型的理想导体，使其在任意入射角下完全转换横电和横磁极化，并且可以使用各向异性材料来模拟任意形状的理想磁导体。该方法还可以与变换光学结合，增强现有的变换光学器件。例如，使用双各向异性材料可以使介电圆柱对两种偏振光都完全透明。
