Abstract
Analytical optimizations and numerical simulations are applied to enhance power transferring through a metal–insulator–metal (MIM) plasmonic junction. Employing the quasi static approximation for subwavelength devices, we derived a pure analytical model which complies very well with the simulation results. By inserting intermediate matching sections and stub structure at the MIM junctions, various matched plasmonic junctions and devices are designed. Both methods considerably improve the transmission spectra of the structure and enhance the bandwidth. The improved T-shaped splitters and demultiplexers of 50nm width are designed with zero reflection at 1550nm wavelength, 18% higher efficiency and broader bandwidth. Finite-difference time-domain simulations validate numerically our analysis and optimization results.
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