High-Sensitive Mid-Infrared Photonic Crystal Sensor Using Slotted-Waveguide Coupled-Cavity
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Date
2022
Journal Title
Journal ISSN
Volume Title
Publisher
Université de M'sila
Abstract
Abstract|In this paper, a novel high-sensitive mid-infrared photonic crystal-based slotted-waveguide
coupled-cavity sensor to behave as a refractive index sensing device is proposed at a mid-infrared
wavelength of 3.9 m. We determine the sensitivity of our sensor by detecting the shift in the resonance
wavelength as a function of the refractive index variations in the region around the cavity. Comparison
shows that mid-infrared photonic crystal-based slotted-waveguide coupled-cavity has higher sensitivity
to refractive index changes than mid-infrared photonic crystal-based slotted-waveguide. The sensitivity
can be improved from 938 nm/per refractive index unit (RIU) to 1161 nm/RIU within the range of n = 1{
1.05 with an increment of 0.01 RIU in the wavelength range of 3.3651 m to 4.1198 m by creating a
microcavity within the proposed structure, calculated quality factor (Q-factor) of 1:0821 107 giving a
sensor gure of merit (FOM) up to 2:917 106, and a low detection limit of 3:9 106 RIU. Furthermore,
an overall sensitivity is calculated to be around S = 1343:2 nm/RIU for the case of higher refractive
indices of analytes within the range of n = 1{1.2 with an increment of 0.05 RIU. The described work and
the achieved results by performing 2D- nite-difference time-domain (2D-FDTD) simulations con rm the
ability to realize a commercially viable miniaturized and highly sensitive mid-infrared photonic crystal-
based slotted-waveguide coupled-cavity sensor.