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We propose a novel and compact plasmonic sensing structure based on a metal–insulator–metal (MIM) waveguide with a side-coupled hexagonal cavity. The sensing structure has been numerically and theoretically investigated using the finite- difference time-domain (FDTD) method and temporal coupled-mode theory. The numerical simulation results show that the resonance dips of the structure have a high...
Based on a metal-insulator-metal (MIM) waveguide with a side-coupled nanodisk cavity, the sensor using the surface plasmon polaritons (SPPs) refractive index is investigated and studied numerically. The finite-difference time-domain (FDTD) method is used to simulate the performance of the sensor. The numerical simulation result indicates that all the resonance wavelengths in the transmission characteristic...
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