Asymmetrical Dimer Photonic Crystals Enabling Outstanding Optical Sensing Performance

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Abstract

The exploration of the propensity of engineered materials to bring forward innovations predicated on their periodic nanostructured tailoring rather than the features of their individual compounds is a continuous pursuit that has propelled optical sensors to the forefront of ultra-sensitive bio-identification. Herein, a numerical analysis based on the Finite Element Method (FEM) was used to investigate and optimize the optical properties of a unidirectional asymmetric dimer photonic crystal (PhC). The proposed device has many advantages from a nanofabrication standpoint compared to conventional PhCs sensors, where integrating defects within the periodic array is imperative. The eigenvalue and transmission analysis performed indicate the presence of a protected, confined mode within the structure, resulting in a Fano-like response in the prohibited states. The optical sensor demonstrated a promising prospect for monitoring the DNA hybridization process, with a quality factor (QF) of roughly (Formula presented.) and a detection limit (DL) of (Formula presented.) RIU. Moreover, this approach is easily scalable in size while keeping the same attributes, which may potentially enable gaze monitoring.

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Mangach, H., El Badri, Y., Hmima, A., Bouzid, A., Achaoui, Y., & Zeng, S. (2023). Asymmetrical Dimer Photonic Crystals Enabling Outstanding Optical Sensing Performance. Nanomaterials, 13(3). https://doi.org/10.3390/nano13030375

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