论文标题
超薄碳纳米管膜的集体激发和光学响应
Collective Excitations and Optical Response of Ultrathin Carbon Nanotube Films
论文作者
论文摘要
我们提出了一项理论研究，该研究对负责超薄平面平行均匀的周期性单壁碳纳米管阵列和弱不均匀的单壁碳纳米管膜的集体准颗粒激发刺激。我们表明，除了不同的膜组成之外，可以通过改变膜厚度来控制集体响应。对于单型纳米管阵列，介电响应的实际部分显示出构成纳米管的量子间跨频段过渡附近的宽负负折射条，因此该系统在较高的频率下的超纤维超材料与那些经典等离子体振荡必须提供的频率更高。通过降低纳米管直径，可以将这种负折射推向可见区域，并使用弱不均匀的多型纳米管膜可以扩大其带宽。
We present a theoretical study of the collective quasiparticle excitations responsible for the electromagnetic response of ultrathin plane-parallel homogeneous periodic single-wall carbon nanotube arrays and weakly inhomogeneous single-wall carbon nanotube films. We show that in addition to varying film composition, the collective response can be controlled by varying the film thickness. For single-type nanotube arrays, the real part of the dielectric response shows a broad negative refraction band near a quantum interband transition of the constituent nanotube, whereby the system behaves as a hyperbolic metamaterial at higher frequencies than those classical plasma oscillations have to offer. By decreasing nanotube diameters it is possible to push this negative refraction into the visible region, and using weakly inhomogeneous multi-type nanotube films broadens its bandwidth.
