Mr. Foziyeh Sohrabi Profile

Foziyeh Sohrabi

at Institute of Photonics and Electronics of the CAS, v.v.i.

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Proceedings Article | 31 May 2023 Poster

Multimodal plasmonic nanostructures with modes in UV and VIS for high-performance biosensing

Zdeněk Garčic, Foziyeh Sohrabi, Jiří Slabý, Jiří Homola

Proceedings Volume 12572, 125721X (2023) https://doi.org/10.1117/12.2670329

KEYWORDS: Nanostructures, Ultraviolet radiation, Plasmonics, Biosensing, Electromagnetism, Biosensors, Biomolecules, Proteins, Plasmonic sensors, Nucleic acids

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Plasmonic nanostructures are widely studied for the construction of affinity-based biosensors. In these biosensors, the plasmonic resonances in visible (VIS) and near-infrared (NIR) regions are used to probe the vicinity of the nanostructure, where the molecules of interest (an analyte) are bound to the surface. Although biosensing is limited to the VIS/NIR regions in conventional plasmonic sensors, sensing in the ultraviolet (UV) region provides the capability of detecting proteins or biological compounds which are fluorescent or have absorption bands in the UV region. In this work, we report on the novel approach that employs plasmonic nanostructures with multiple modes supported in UV and VIS regions to provide high-performance biosensing. The UV mode is spectrally tuned to the targeted biomolecules, and the VIS mode provides high refractive-index sensitivity. Using numerical electromagnetic simulations, we analyzed two bimetallic (aluminum and gold) nanostructures. We demonstrated that optimizing the geometrical parameters of these nanostructures allows us to tune the short-wavelength resonance to a region suitable for UV fluorescence/absorption while providing sufficient electromagnetic field overlap with the long-wavelength resonance in the VIS region for high-performance biosensing. The designed plasmonic nanostructures thus can be employed to identify and quantify the biomolecules simultaneously.

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