Abstract
In this study, we investigate the plasmon response of two concentric aluminum (Al) nanoshells as a nanomatryushka unit to introduce a novel compositional structure that has a strong potential to employ in designing practical nanoscale plasmonic devices. Herein, we employed Al nanoshells with a coverage of oxide (Al2O3) layer with certain and homogenous size of thickness in inner and outer sides. Using plasmon hybridization theory and finite-difference time-domain (FDTD) method as numerical model, we calculated and sketched the optical response and energy level diagram for the studied structure. Strong plasmon resonances are reported in the UV and visible wavelengths that can be supported efficiently by using the proposed nanomatryushka unit composed of Al/Al2O3 on a SiO2 surface. Utilizing presented nanomatryushka in designing an artificial dimer configuration, the possibility of appearing of dark modes and formation of Fano resonances in such a symmetric structure in the UV and visible spectra are verified numerically. Immersing the presented dimer in various liquids with different refractive indices, the behavior of Fano dip is investigated and corresponding figure of merit (FoM) is quantified based on the plasmon resonance energy shifts over the refractive index variations. This understating opens novel avenues to obtain sharp and deep Fano resonances in simple and low-cost structures that have strong potentials in fabrication of biochemical sensors, superlensing, and biological agents.
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This work is supported by NSF CAREER program with the Award number: 0955013.
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Ahmadivand, A., Pala, N. Localization, Hybridization, and Coupling of Plasmon Resonances in an Aluminum Nanomatryushka. Plasmonics 10, 809–817 (2015). https://doi.org/10.1007/s11468-014-9868-z
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DOI: https://doi.org/10.1007/s11468-014-9868-z