Jiang Wei Xiang, Xu Bai Bing, Cheng Qiang, Cui Tie Jun, Yu Guan Xia
J Opt Soc Am A Opt Image Sci Vis. 2013 Aug 1;30(8):1698-702. doi: 10.1364/JOSAA.30.001698.
Scaling devices that can shrink or enlarge an object are designed using transformation optics. The electromagnetic scattering properties of such scaling devices with anisotropic parameters are rigorously analyzed using the eigenmode expansion method. If the radius of the virtual object is smaller than that of the real object, it is a shrinking device with positive material parameters; if the radius of the virtual object is larger than the real one, it is an enlarging device with positive or negative material parameters. Hence, a scaling device can make a dielectric or metallic object look smaller or larger. The rigorous analysis shows that the scattering coefficients of the scaling devices are the same as those of the equivalent virtual objects. When the radius of the virtual object approaches zero, the scaling device will be an invisibility cloak. In such a case, the scattering effect of the scaling device will be sensitive to material parameters of the device.
可对物体进行缩小或放大的缩放装置是利用变换光学设计的。利用本征模展开法对具有各向异性参数的此类缩放装置的电磁散射特性进行了严格分析。如果虚拟物体的半径小于真实物体的半径，它就是具有正材料参数的缩小装置；如果虚拟物体的半径大于真实物体的半径，它就是具有正或负材料参数的放大装置。因此，一个缩放装置可以使电介质或金属物体看起来更小或更大。严格分析表明，缩放装置的散射系数与等效虚拟物体的散射系数相同。当虚拟物体的半径趋近于零时，缩放装置将成为一个隐形斗篷。在这种情况下，缩放装置的散射效应将对该装置的材料参数敏感。
