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Optimizing photonic and phononic crystal parameters for sensing organic compounds

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Abstract

In this paper, we have introduced a multilayer periodic structure with a defect layer as a sensor for a variety of organic compounds. Here, we have considered the interaction of both electromagnetic and acoustic radiations with the designed sensor, which could offer flexibility in the detection process. Si and MgO are the basic materials in the design of the proposed sensor. In this context, this sensor is configured as {Si (Si/MgO)N (liquid) (MgO/Si)N Si}. The optimization procedure is based on the change of the thickness of the defect layer and the structure's periodicity. The simulation results were carried through the transfer matrix method to calculate the photonic and phononic transmittance. The structure is analyzed of the photonic and acoustic transmittance as the defect layer is filled with water, benzene, DIPE, n‑Heptane, n‑Hexane, and n‑Octane. The analysis includes determining their defect peak frequency, full width at half maximum, quality factor, sensitivity, and figure of merit. The calculated photonic sensitivity for n‑Heptane is 43.8 \((\mathrm{THz}/\mathrm{RIU})\) with 154.8 \({\left(\mathrm{RIU}\right)}^{-1}\) figure of merit, while its acoustic sensitivity equivalent 1.614 \((\mathrm{MHz}/{\mathrm{ms}}^{-1})\) with a figure of merit equals 1.06 \({\left(\mathrm{m}/\mathrm{s}\right)}^{-1}\). From the simulation results, the structure shows a promise response for sensing different organic compounds with high sensitivity.

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Correspondence to Arafa H. Aly.

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Ameen, A.A., Elsayed, H.A., Mahmoud, M.A. et al. Optimizing photonic and phononic crystal parameters for sensing organic compounds. Appl Nanosci 11, 2703–2716 (2021). https://doi.org/10.1007/s13204-021-02236-1

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  • DOI: https://doi.org/10.1007/s13204-021-02236-1

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