Optical switch effect of metal-dielectric-metal plasmonic waveguide coupled with stub structure

作者：Gao, X.^*; Ning, L.

来源：Optik, 2012, 123(15): 1326-1328.

DOI：10.1016/j.ijleo.2011.03.037

• Metal-dielectric-metal waveguide
• Plasmonic waveguide
• Localized surface plasmons
• Optical switch

The transmission line theory (TLT) and the finite difference time domain (FDTD) method are applied to investigate the optical transmission characteristics of the metal dielectric metal (MDM) plasmonic waveguide coupled with a stub structure. The transmission rate of the FDTD simulation results demonstrates periodically variation from less than 1% to more than 92% as a function of the length of the stub, which fits well with the results of TLT. Furthermore, the transmission also performs a periodically switch distribution with the change of the refractive index of the stub from 1.0 to 2.0 gradually. Both methods are adopted for modulating the superposition phase of the interference between the reflected surface plasmon polaritons (SPPs) wave from the end of the stub and the passing SPPs wave in the waveguide, which can be interpreted as the principle mechanism for the optical switch effect of the MDM waveguide with a stub structure.

• 出版日期2012
• 单位桂林电子科技大学