Department of Electrical Engineering, Stanford University, California 94305, USA.
Phys Rev Lett. 2011 Jun 3;106(22):223902. doi: 10.1103/PhysRevLett.106.223902. Epub 2011 Jun 2.
We use metamaterials with extreme anisotropy to solve the fundamental problem of light transport in deep subwavelength apertures. By filling a simply connected aperture with an anisotropic medium, we decouple the cutoff frequency and the group velocity of modes inside apertures. In the limit of extreme anisotropy, all modes become purely transverse electromagnetic modes, free from geometrical dispersion, propagate with a velocity controlled by the transverse permittivity and permeability, and have zero cutoff frequency. We analyze physically realizable cases for a circular aperture and show a metamaterial design using existing materials.
我们使用具有极端各向异性的超材料来解决深亚波长光在光口中传输的基本问题。通过在一个连通光口内填充各向异性介质，我们解耦了光口内模式的截止频率和群速度。在极端各向异性的极限下，所有模式都成为纯粹的横电磁模式，不受几何色散的影响，以由横向介电常数和磁导率控制的速度传播，并且截止频率为零。我们分析了圆形光口的物理可实现情况，并展示了一种使用现有材料的超材料设计。
