Nikolaenko Andrey E, Papasimakis Nikitas, Chipouline Arkadi, De Angelis Francesco, Di Fabrizio Enzo, Zheludev Nikolay I
Optoelectronics Research Centre & Centre for photonic Metamaterials, University of Southampton, Southampton, SO17 1BJ, UK.
Opt Express. 2012 Mar 12;20(6):6068-79. doi: 10.1364/OE.20.006068.
We provide the first demonstration of exceptional light-with-light optical switching performance of a carbon nanotube metamaterial - a hybrid nanostructure of a plasmonic metamaterial with semiconducting single-walled carbon nanotubes. A modulation depth of 10% in the near-IR with sub-500 fs response time is achieved with a pump fluence of just 10 μJ/cm², which is an order of magnitude lower than in previously reported artificial nanostructures. The improved switching characteristics of the carbon nanotube metamaterial are defined by an excitonic nonlinearity of carbon nanotubes resonantly enhanced by a concentration of local fields in the metamaterial. Since the spectral position of the excitonic response and metamaterial plasmonic resonance can be adjusted by using carbon nanotubes of different diameter and scaling of the metamaterial design, the giant nonlinear response of the hybrid metamaterial - in principle - can be engineered to cover the entire second and third telecom windows, from O- to U-band.
我们首次展示了碳纳米管超材料（一种由等离子体超材料与半导体单壁碳纳米管组成的混合纳米结构）卓越的光控光光学开关性能。在近红外波段实现了10%的调制深度，响应时间小于500飞秒，泵浦通量仅为10 μJ/cm²，这比之前报道的人工纳米结构低一个数量级。碳纳米管超材料改善后的开关特性由超材料中局部场集中共振增强的碳纳米管激子非线性来定义。由于激子响应和超材料等离子体共振的光谱位置可以通过使用不同直径的碳纳米管和超材料设计的缩放来调整，原则上，这种混合超材料的巨大非线性响应可以设计成覆盖从O波段到U波段的整个第二和第三电信窗口。
