الفهرس 
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Abstract
To the best of our knowledge, for the first time, a defected phononic crystal based high sensitive gas sensor. Our study shows a remarkable sensitivity towards O2, CO2, NH3, and CH4 gases based on [(Lead/Epoxy)2 - (different gases) - (Lead/Epoxy)2] structure for the first time. The inserted gases in the defected layer, make specific Fano resonant peaks through the phononic band gaps that related to the properties of each gas. Based on our literature review, no complete study showed sensitivity, quality factor, and figure-of-merit investigations based on the transfer matrix method. For the first time, our proposed phononic crystal gas sensor shows high sensitivity values due to the appearance of Fano resonance peaks. Moreover, we introduced the effect of the damping rate of the incident wave inside our gas sensor on the sensitivity and FWHM. The effect of temperature (30 oC-80oC) on the sensitivity, FWHM and quality factor, and the damping rate of the [(Lead/Epoxy)2 - (different gases) - (Lead/Epoxy)2] 1D-DPC gas sensor for O2, CH4, CO2, and NH3 gases was studied and calculated.
A 1D- defected phononic crystal used to quantify small changes in the properties of the liquid analyte was obtained. For the first time, our work showed a remarkable sensitivity for acetone, ethanol, methanol, chloroform, phenol, 1-propanol, and mercury harmful liquids based on a 1D-DPC demultiplexer liquid sensor. Inserted more than one liquid in the three cavities and detected them inside our1D-DPC demultiplexer liquid sensor at the same time, make specific resonant peaks through the phononic band gaps that related to the properties of each liquid. Further, we examined the ability of our 1D-DPC liquid sensor to detect the different concentrations of ethanol. Moreover, the use of a novel 1D-DPC demultiplexer liquid sensor to detect more than one liquid at the same time opens the door to an entirely new type of liquid sensing modality in the simple 1D designs that can complement the traditional gain and frequency measurements that are performed nowadays. Based on our literature review, no complete study showed sensitivity, quality factor, and figure-of-merit investigations based on the transfer matrix method for the 1D-DPC demultiplexer liquid sensor.
For the first time, our proposed 1D-DPC demultiplexer liquid sensor shows high sensitivity values compared to the 1D-DPC liquid sensor. Moreover, we studied the damping rate of the incident wave inside our 1D-DPC demultiplexer liquid sensor. The sensitivity, FWHM, and quality factor, and the damping rate for each 1D-DPC demultiplexer liquid sensor and a 1D-DPC liquid sensor for acetone, ethanol, methanol, chloroform, and mercury harmful liquids was studied and calculated.