Tuning the Dispersion with Metal and Dielectric Layer Combination for Wavelength Multiplexing Plasmonic Metasurface Design

Thin layer plasmonic metasurfaces have offered the exciting features of guided-mode resonance, surface plasmon propagation, and converting propagating wave to surface wave. In nanophotonic devices, especially in waveguide applications, this performance can tune the propagation mode in the dielectric cavity. As the functionality of the plasmonic devices depends on the light dispersion, the wavelength-dependent dispersion engineering for the plasmonic band structure is an essential measure of proper light coupling. The main focus of this study is to select the metal-dielectric layer combination for enhancing the plasmonic mode excitation and channel as the guided mode. The plasmonic metasurface design based on this structure is investigated for their surface plasmon polariton generation. With the metasurface element phase control capability, the long-range or short-range plasmonic coupling maneuver can be utilized in the sensing application. Also, controlling the directionality of the coupled plasmonic wave depending on the incident light wavelength gives the device application in the optical coding.