Nanoscale Res Lett. 2012;7(1):335. doi: 10.1186/1556-276X-7-335. Epub 2012 Jun 21.
The diffraction spectra of Imaginary-Part Photonic Crystal (IPPC) slabs are analyzed by using Scattering-Matrix Method. By investigating the thickness dependence of the diffraction, we find the remarkable red shift of central wavelength of diffraction spectrum, which obviously distinguishes from the phenomenon of spectral hole. We observe that diffraction efficiency can be enhanced more than twentyfold by optimizing the geometry parameters. These imply that the diffraction spectra of the IPPC slab can be controlled at will and used to guide the design to achieve useful nanoscale devices.
利用散射矩阵方法分析了虚光子晶体（IPPC）平板的衍射光谱。通过研究衍射的厚度依赖性，我们发现了中心波长的明显红移，这明显区别于光谱孔现象。我们观察到通过优化几何参数可以将衍射效率提高二十多倍。这意味着可以随意控制 IPPC 平板的衍射光谱，并用于指导设计以实现有用的纳米级器件。
