Abstract
Aluminum nanostructures have been considered as promising substitutions for conventional noble metals with the ability to sustain strong hybridized plasmon resonant modes across the ultraviolet (UV) to visible spectrum. Here, we introduce a nanoantenna consisting of a pair of aluminum truncated hollow triangles in a head-to-head orientation, resembling a bowtie antenna. Depositing the antenna on a glass substrate, we show that the proposed nanoantenna can be tailored to support Fano-like resonant mode at the near-UV band via suppression of dipolar broad bright mode by a narrow dark mode. Using a conductive layer in contact below the studied aluminum antenna, we prepared a platform to intensify the energy of hybridized plasmonic modes to induce pronounced Fano resonant mode across the UV spectrum. This remarkable effect occurred because of presence of a conductive layer below the antenna, which caused the narrowing of the bright mode and pushing this mode to higher energies. This finding paves new promising strategies to design efficient UV-based plasmonic devices for several practical purposes from sensing to switching.
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Nooshnab, V., Golmohammadi, S. Conductive substrate-mediated Fano resonances in aluminum truncated hollow bowtie nanoantenna across the ultraviolet. Opt Quant Electron 48, 192 (2016). https://doi.org/10.1007/s11082-016-0474-5
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DOI: https://doi.org/10.1007/s11082-016-0474-5