Abstract
The concept of antireflection coating in the theory of multilayer films is introduced to the two-dimensional metal–insulator–metal (MIM) structures to realize total transmission of optical energy at the waveguide discontinuities. The antireflection structure consists of a resonant cavity which is constructed by changing the insulator width of the waveguide. A numerical method is used to achieve the optimal design directly. A T-splitter with zero reflection is proposed, utilizing a cavity structure in the input waveguide. A transformer with enhanced transmission between different waveguides is presented for further validating the efficiency and generality of these cavity based antireflection structures. The simulation results show that such a structure can realize a perfect antireflection function.
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Liu, J., Zhao, H., Zhang, Y. et al. Resonant cavity based antireflection structures for surface plasmon waveguides. Appl. Phys. B 98, 797–802 (2010). https://doi.org/10.1007/s00340-009-3782-7
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DOI: https://doi.org/10.1007/s00340-009-3782-7