Design of mid infrared high sensitive metal-insulator-metal plasmonic sensor
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Date
2021
Journal Title
Journal ISSN
Volume Title
Publisher
université msila
Abstract
In this paper, high sensitivity plasmonic refractive index sensor based on implanted cavities in
Metal-Insulator-Metal (MIM) waveguide is designed and analyzed using two dimensional (2D)
FDTD algorithm with perfectly matched layer boundary conditions. The dimensions of the introduced
single and double cavities with rectangular defect are analyzed and simulated for the
best sensor performance. The results reveal in linear correlation between the resonance wavelengths
of the proposed defected cavities and the refractive index of the material under testing
which is placed in the active region of the sensor. Also, simulation results show that the sensor
resolution of refractive index, which depends on wavelength resolution of the detection system,
can reach as high as 3.84 × 10 6 RIU, equivalentely to a sensitivity of 2602.5 nm/RIU, by taking
the wavelength resolution of 0.01 nm.With the achieved optimum design by considering the
tradeoff between the detected power, sensitivity and structure size, the transmittance level is
enhanced by 118.08% compared to the first design. The proposed sensor can be used for different
interesting applications such as identification of various materials including biosensor application,
by proper design.
Description
Keywords
Plasmonic sensor Mid infrared Surface plasmon polaritons(SPP) Metal-insulator-metal (MIM) waveguide Finite difference time domain (FDTD) method