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31 December 2019 Ultrasensitive biosensing based on plasmonic nanostructures
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Hafnium-doped zinc oxide (HZO) has been recently demonstrated to be implemented as a transparent conducting oxide (TCO) material in photovoltaic applications but its plasmonic properties are left untouched. In this work, we systematically investigate the plasmonic properties of gold nanoparticle (Au NP) arrays on thin HZO film, for different ratios of Hf dopants to Zinc oxide (ZnO) film. A localized surface plasmon resonant (LSPR) mode and two Bragg modes (due to the coupling of plasmon modes inside the film to array periodicity) are observed in the proposed structure. Resonant excitation of these modes produces large field enhancement at the surface of the NPs as well as Au NP/HZO film interface and was observed with FDTD simulations. The optimized plasmonic structure will be fabricated on quartz crystal microbalance (QCM) using laser interference lithography, based on the plasmonic resonant position and the SERS (surface enhanced Raman scattering) intensity, and it will be integrated to a microfluidic device in the configuration of the lab-on-a-chip concept for biosensing applications.
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P. Venugopalan, N. S. Susan Mousavi, A. Dabirian, and S. Kumar "Ultrasensitive biosensing based on plasmonic nanostructures", Proc. SPIE 11201, SPIE Micro + Nano Materials, Devices, and Applications 2019, 112011A (31 December 2019);

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