Abstract
In this paper, we have proposed a metal-insulator-metal (MIM) pressure sensor which consists of two plasmonic waveguides and a double square ring resonator. The two square rings are connected via a rectangular patch located between the two of them. The surface plasmon polaritons (SPPs) can be transferred from a square ring to the other through this patch. The finite-difference time-domain method (FDTD) has been used to simulate the device. Applying a pressure on the structure, it deforms, and a red shift of 103 nm in the resonance wavelength has been calculated. The deformation is linearly proportional to the wavelength shift in a wide range of wavelength. The proposed optical plasmonic pressure sensor has a sensitivity of 16.5 nm/MPa which makes it very suitable for using in biological and biomedical engineering.
Highlights
Metal-insulator-metal waveguides guide light via the refractive index differential between the insulating core and the conducting cladding
Our research has been conducted on pressure sensing based on an MIM structure consisting of a double square ring resonator and surface plasmon polaritons (SPPs) waveguides
The slight deformation in volume of waveguide (I) due to an applied pressure leads to a shift in resonant wavelength of the structure, since the light propagating in the resonators is coupled to the waveguide (I) on its way to the output waveguide
Summary
Metal-insulator-metal waveguides guide light via the refractive index differential between the insulating core and the conducting cladding. An effective characteristic in metal-insulator-metal (MIM) waveguides is that they guide optical modes in subwavelength scale regardless of plasmon resonance frequency and the field decay is partial in exterior areas of the waveguide [1]. In such structures, surface plasmon polaritons (SPPs) can be excited and confined in the insulator region. Wu et al employed an H-type SPP resonator and MIM waveguides as a pressure sensor [17]. Our research has been conducted on pressure sensing based on an MIM structure consisting of a double square ring resonator and SPP waveguides. It is demonstrated that the resonant wavelength has a considerable shift when there is a deformation in the structure due to applied pressure
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