Abstract
In this paper, we demonstrate a novel salinity sensor based on Tamm-plasmon-polariton (TPP), comprising different shapes of Bragg reflector (ordinary, texturing, and sawtooth) and metallic layer. The finite element method is used to study the considered structure and sensing performance by using the COMSOL multiphysics simulation procedure. Here, we study the effect of surface morphology on the sensitivity; firstly, in the case of one-dimensional photonic crystal-centered defect, it harms the sensitivity; secondly, texturing and sawtooth in the case of Tamm resonance increases the sensitivity, as for texturing the surface, the sensitivity quality factor (Q) = 236 and figure of merit (FOM) = 170. For sawtooth surfaces, Q = 272.4, and FOM = 199. The consequences of structural parameters on the efficiency of sensing are studied, and new procedures are proposed to enhance TPP-based sensors. A simple and functional alternative to conventional salinity sensors may be the proposed solution.
Highlights
Photonic crystals (PCs) are an artificial structure arrangement in high-low dielectric materials in periodicity to governor the propagation of electromagnetic waves (EMW) through structures [1,2,3]
We study the effect of surface morphology on the defected one dimensional photonic crystal of the ordinary 1D PCs, texturing 1D PCs and sawtooth 1D PCs as in figure (1), by adding a central defect layer from saline water and we calculate the sensitivity of the considered structure
In figure (3.B) we added a defect layer from saline water in the center of the structure with a thickness equal to 60 nm, we noticed that we have a defect peak at a wavelength equal to 308 nm but we don’t able to discrimination between the different refractive index of saline water so that we zoom on the wavelengths range (303-313) nm as in figure (3.C)
Summary
Photonic crystals (PCs) are an artificial structure arrangement in high-low dielectric materials in periodicity to governor the propagation of electromagnetic waves (EMW) through structures [1,2,3]. Photonic crystals (PCs) received great attention due to their unique properties in optical applications such as optical fiber [4], Bragg mirrors, optical and temperature sensors [5,6,7,8,9,10], waveguides, solar energy applications [11,12,13], light-emitting diodes (LEDs) [14], optical switches, and solar water desalination [15,16]. TPP modes could be motivated for both TE and TM polarization states Owing to these unique properties, TPP modes provide a promising platform in photonic applications for potential applications such as integrated photonic devices, and highly sensitive optical sensors [35, 36]. We will examine the sensor performance by calculating many parameters such as the sensitivity (S), the figure of merits (FOM), and the quality factor (Q)
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