Investigation of transmission properties in defective one dimensional superconductive photonic crystal for ultralow level bioethanol detection

Abstract

The present study exhibits design and analysis of a superconductor-based defective 1D photonic crystal (PhC) to envisage an ultra-high sensitive ethanol sensor. The proposed structure is realized with alternate layers of high temperature superconductor (YBa2Cu3O7) and dielectric (SrF2) material, whereas the central defect layer is designed with porous silicon (P-Si) material. Transmittance and absorption spectrum are explored theoretically by employing transfer matrix method and two-fluid model. The mainstay of this work is to investigate the shift in wavelength of the resonant mode, which is created within the band gap, in the transmittance spectrum. The position of the defect mode wavelength is assayed by varying the incidence angle, thickness of superconductor layer and operating temperature. An ultra-high wavelength sensitivity of 8.53×105 nm/RIU and temperature sensitivity of 6.673 nm/K are achieved by the proposed sensor, which open up an avenue for effective sensing of different % volume of ethanol with minute refractive index contrast. Besides sensitivity, other sensing parameters like figure of merit, quality factor and detection limit are thoroughly studied and compared with the recently published works. On top of that, the simple structure, easy analysis, and available fabrication techniques make the proposed design a suitable candidate for biosensing applications.