Abstract

This paper presents a plasmonic pressure sensor via an optical metal–insulator–metal (MIM) waveguide structure. The proposed pressure sensor is composed of a ring resonator, a stub, and a U-shaped resonator coupled to the bus waveguide. The finite-difference time-domain method (FDTD) is used to study the Fano resonance (FR) characteristics and magnetic field distributions. Results show that the Fano line shapes can be independently tuned by the geometrical parameters. When pressure is exerted on the U-shaped resonator layer, the deformation leads to the shift of the resonant wavelength. The calculated maximum pressure sensitivities are 10.96 and ${{10}}{\rm{.5}}\;{\rm{nm/MPa}}$ for FR 2, and FR 3, respectively (${\rm MPa} = {10^6}\;{\rm{Pa}}$). The good linear relationship between the pressure and resonance wavelength indicates that the proposed nano-scale structure can find potential applications in the fields of nano-biosensing and biomedical sensing.

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