Fano resonance based defected 1D phononic crystal for highly sensitive gas sensing applications

Abstract

The defected acoustic band gap materials are promising a new generation of sensing technology based on layered cavities. We introduced a novel 1D defected phononic crystal (1D-DPC) as a high-sensitive gas sensor based on the Fano resonance transmitted window. Our designed (Lead–Epoxy) 1D-DPC multilayer has filled with a defect layer with different gases at different temperatures. In this study, Fano resonance—based acoustic band gap engineering has used to detect several gases such as O2, CO2, NH3, and CH4. For the first time, Fano resonance peaks appeared in the proposed gas sensor structures which attributed to high sensitivity, Q-factor, and figure-of-merit values for all gases. Also, the relation between the Fano resonance frequency and acoustic properties of gases at different temperatures has been studied in detail. The effect of the damping rate on the sensitivity of the gas sensor shows a linear behavior for CO2, O2, and NH3. Further, we introduced the effect of temperature on the damping rate of the incident waves inside the 1D-DPC gas sensor. The highest sensitivity and figure of merit were obtained for O2 of 292 MHz/(kg/m3) and 647 m3/Kg, respectively. While the highest figure-of-merit value of 60 °C−1 at 30 °C was attributed to O2. The transfer matrix method is used for calculating the transmission coefficient of the incident acoustic wave. We believe that the proposed sensor can be experimentally implemented.

Tubular phononic crystal sensor

“…At resonance, the volumetric vibrations are substantially supported by plate vibrations and combine in compound bi-medium oscillators 22 . The respective peak frequency has been exploited to sense acoustic properties of the embedding fluid with high sensitivity [23][24][25] .…”

Wave excitation and dynamics in non-Hermitian disordered systems

“…Thus, transmission cannot vanish in a strictly 1D structure. Reports of the vanishing of transmission in 1D structures with Fano line shapes [90,91] must therefore indicate that the samples studied are not strictly 1D. Similarly, calculations of nulls in conductance in systems containing coupled quantum dots with single channels leads [92,93] and in transmission through a cavity with a single incident and outgoing channel may arise because the interior of the system supports several internal transverse channels [37,94].…”

Selectivity in trace gas sensing: recent developments, challenges, and future perspectives

“…Recent experimental and theoretical demonstrations show that high sensitivity and high-quality factor can be achieved by using different PhC sensor configurations/sensors 209,210 e.g. , PhC waveguide, 211,212 PhC nanoresonator, 213,214 PhC cavity, 215,216 polymeric PhC, 217 1-D PhC, 218,219 2-D PhC, 83,220 3-D PhC, 221 plasmonic PhC, 222 MEMS PhC, 223 porous PhC, 224 and PhC fiber. 164,225,226…”