Wiltshire M C K, Pendry J B, Hajnal J V
Imaging Sciences Department, Clinical Sciences Centre, Imperial College London, Hammersmith Hospital Campus, Ducane Road, London W12 0NN, UK. The Blackett Laboratory, Department of Physics, Imperial College London, South Kensington, London SW7 2AZ, UK.
J Phys Condens Matter. 2009 Jul 22;21(29):292201. doi: 10.1088/0953-8984/21/29/292201. Epub 2009 Jun 18.
Chiral Swiss rolls, consisting of a metal/dielectric laminate tape helically wound on an insulating mandrel, have been developed to form the basis of a highly chiral metamaterial. We have fabricated these elements using a custom-built machine, and have characterized them. We find that the permeability, permittivity, and chirality are all resonant in the region of 80 MHz. The chirality is so strong that it can be directly measured by observing the magnetic response to an applied electric field, and is larger than either the permeability or the permittivity. We have estimated the refractive indices from these data, and find both strong circular dichroism and a wide frequency range where the refractive index is negative.
手性瑞士卷由金属/电介质层压带螺旋缠绕在绝缘轴心上构成，已被开发用作一种高度手性超材料的基础。我们使用定制机器制造了这些元件，并对其进行了表征。我们发现，磁导率、介电常数和手性在80兆赫兹区域均发生共振。手性非常强，以至于可以通过观察对施加电场的磁响应直接测量，且大于磁导率或介电常数。我们根据这些数据估算了折射率，发现了强烈的圆二色性以及折射率为负的宽频率范围。
