Levy Uriel, Abashin Maxim, Ikeda Kazuhiro, Krishnamoorthy Ashok, Cunningham John, Fainman Yeshaiahu
Dept. of Electrical and Computer Engineering, University of California, San Diego, 9500 Gilman Drive, La Jolla California 92093-0407, USA.
Phys Rev Lett. 2007 Jun 15;98(24):243901. doi: 10.1103/PhysRevLett.98.243901. Epub 2007 Jun 13.
We experimentally demonstrate for the first time the focusing of optical beams within an inhomogeneous dielectric metamaterial with space-variant polarizability, implemented by etching subwavelength structures into a Silicon slab. Light focusing is obtained by creating an artificial slab material with graded refractive index profile. The local refractive index within the slab is modulated by controlling the duty cycle of the subwavelength structures. The demonstrated metamaterial based component can be integrated with various other building blocks towards the realization of devices and systems in free space optics on a chip configuration.
我们首次通过实验证明了在具有空间可变极化率的非均匀介质超材料中实现光束聚焦，该超材料是通过在硅片上蚀刻亚波长结构来实现的。通过创建具有渐变折射率分布的人工平板材料来实现光聚焦。平板内的局部折射率通过控制亚波长结构的占空比来调制。所展示的基于超材料的组件可以与各种其他构建模块集成，以实现芯片配置的自由空间光学中的器件和系统。
