In this work, we compare the performance of plasmonic waveguide integrated stub resonators based on 2D metal-dielectric-metal and 3D slot waveguide (SWG) geometries. We show that scattering matrix theory can be extended to 3D devices, and by employing scattering matrix theory, we provide the guidelines for designing plasmonic 2D and 3D single-stub and double-stub resonators with a desired spectral response at the design wavelength. We provide transmission maps of 2D and 3D double-stub resonators versus stub lengths, and we specify the different regions on these maps that result in a minimum, a maximum, or a plasmonically induced transparency shape in the transmission spectrum. Radiation loss from waveguide terminations leads to a degradation of the 3D SWG-based resonators. We illustrate improved waveguide terminations that boost resonator properties. We verify our results with 3D finite-difference time-domain (FDTD) simulations.
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