Plasmonic nano-structured array sensors have been highlighted by their tremendously promising applications, such as the
surface plasmon resonance (SPR) optical biosensors. In this paper, within the visible spectrum region, the optical
transmission properties of a metallic thin film deposited over dielectric films of various refraction indices are
investigated. With finite difference time domain (FDTD) method, we investigate the optical transmission spectra of such
plasmonic structures based on both nano-holes and nano-disc arrays. This investigation includes monitoring the
modification in both the transmission resonance wavelengths and peak transmittance. The results of this study provide a
better understanding of the interaction between light and plasmonic nano-hole and nano-disc arrays. It shows that the
changing the shapes of the nano-holes can affect the resonance wavelengths and the intensity of transmitted spectra and
alter its resonance peak transmittance values. We found that the interaction coupling between the localized plasmons
(LSP) and the propagating surface plasmons (PSP) can be tuned to boost the performance of the optical sensor.
Marwa M. Tharwat, Haya AlSharif, Haifaa Alshabani, Eilaf Qadi, and Maha Sultan, "Design of an optical sensor based on plasmonic nanostructures," Proc. SPIE 9883, Metamaterials X, 98830G (Presented at SPIE Photonics Europe: April 05, 2016; Published: 18 April 2016); https://doi.org/10.1117/12.2227890.
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