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<p>An efficient refractive index (RI) biosensor based on the structure of side-coupled microcavity two-dimensional photonic crystal (2DPC) is presented. The biosensor is intended to accurately identify blood constituents that have different RIs. The calculated transmittance spectrum of the sensor, in the presence of an analyte, demonstrates a resonant peak within the photonic bandgap (PBG) region. The resonance wavelength shifts to higher values in response to the increase in the analyte RI. The transmittance efficacy at the resonant wavelength is found to be approximately 91% with the resonant peak exhibiting a line width of 1.4&#xa0;nm. The sensitivity (S), quality factor (Q), and detection limit (DL) are quantitatively assessed, yielding values of 670&#xa0;nm per refractive index unit (nm/RIU), 1053, and 2.1 × 10<sup>–4</sup> RIU, respectively. These findings indicate that the proposed structure can be utilized as an efficient biosensor. Moreover, with a size of around 18.95 μmμ<sup>2</sup>, the biosensor is considered compact and can be easily integrated into electronic circuits.</p>

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Side-Coupled Microcavity Biosensor for Detection of Blood Components

  • 期刊论文

  • 发表日期：

    2025年1月16日

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  • Khedr M. Abohassan

摘要

An efficient refractive index (RI) biosensor based on the structure of side-coupled microcavity two-dimensional photonic crystal (2DPC) is presented. The biosensor is intended to accurately identify blood constituents that have different RIs. The calculated transmittance spectrum of the sensor, in the presence of an analyte, demonstrates a resonant peak within the photonic bandgap (PBG) region. The resonance wavelength shifts to higher values in response to the increase in the analyte RI. The transmittance efficacy at the resonant wavelength is found to be approximately 91% with the resonant peak exhibiting a line width of 1.4 nm. The sensitivity (S), quality factor (Q), and detection limit (DL) are quantitatively assessed, yielding values of 670 nm per refractive index unit (nm/RIU), 1053, and 2.1 × 10–4 RIU, respectively. These findings indicate that the proposed structure can be utilized as an efficient biosensor. Moreover, with a size of around 18.95 μmμ2, the biosensor is considered compact and can be easily integrated into electronic circuits.