Easy-to-Design Nano-Coupler Between Metal–Insulator–Metal Plasmonic and Dielectric Slab Waveguides
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- Hodaei, H., Rezaei, M., Miri, M. et al. Plasmonics (2013) 8: 1123. doi:10.1007/s11468-013-9519-9
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An easy-to-design single-stub nano-coupler is proposed to increase the direct coupling efficiency between metal–insulator–metal (MIM) plasmonic and high-index dielectric waveguides. The modal reflection and transmission from the junction are exploited to provide a circuit description for the structure. The return loss of direct coupling is then minimized by loading the MIM waveguide with a single stub. Numerical examples are given, and the accuracy of the model is examined via finite-difference time-domain method.