An Ultra-Compact Plasmonic Sensor Design Based on Multiple Fano Resonances in MIM Waveguide Resonator System

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Ahlam Harhouz
Abdesselam Hocini
Hadjira Tayoub

Abstract

In this work, an ultra-compact plasmonic sensor design based on Multiple Fano Resonances in
MIM waveguide resonator system is proposed. A simple design, which is highly desirable for
plasmonic optical sensing. The plasmonic structure consisting of MIM waveguide coupled with
Defective resonator. The optical sensor is studied and investigated numerically by using the
finite difference time domain method (FDTD). In this proposed structure, multiple Fanoresonant
peaks are obtained in the spectra by employing MIM waveguide coupled with an oval
resonator. Our simulation results show a large range of resonances modes and high
performance of transmission and detection. The intensity and position of the Fano resonance
modes can be adjusted easily and flexibly by alteration the refractive index (RI) of the filling
medium. In comparison to other similar optical sensors, our proposed plasmonic sensor design
has relatively comparable sensitivity, which may have application in plasmonic and
nanophotonic integrated circuits, slow light device, label free detection, nanoscale filter, and
other related plasmonic devices.

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