Heriot-Watt University, School of Engineering and Physical Sciences, Edinburgh, UK, EH14 4AS.
Opt Lett. 2010 Jan 15;35(2):130-2. doi: 10.1364/OL.35.000130.
We show theoretical and experimental characterizations of a nanostructured gradient-index lens. The elliptical lens is a nonguiding element fabricated using the mosaic method, which is widely used for the fabrication of photonic crystal fibers. For the first time we show experimental data in the optics regime that confirm the effective medium approximation for discrete mosaic structures with subwavelength feature size. This opens the door for the development of general asymmetric gradient-index materials.
我们展示了一种纳米结构梯度折射率透镜的理论和实验特性。这种椭圆形透镜是使用镶嵌法制造的非引导元件，该方法广泛用于光子晶体光纤的制造。我们首次在光学领域展示了实验数据，这些数据证实了具有亚波长特征尺寸的离散镶嵌结构的有效媒质近似。这为开发通用的非对称梯度折射率材料开辟了道路。
