论文部分内容阅读
A subwavelength plasmonic waveguide filter with symmetric grating distribution is proposed using the metal insulator-metal (MIM) structure.By cascading two gratings with different widths in a period,we can improve the number of pass bands,as well as the transmittance of each band up to ～70 ％ compared to gratings with the same width.Such a device can find applications in various optical systems as wavelength demultiplexing component.