Abstract
We numerically investigate the multipolar plasmonic resonances of Aluminum nanoantenna tuned by a monolayer graphene from ultraviolet (UV) to visible regime. It is shown that the absorbance of the plasmonic odd modes (l = 1 and l = 3) of graphene–Al nanoribbon structure is enhanced while the absorption at the plasmonic even modes (l = 2) is suppressed, compared to the pure Al nanoribbon structure. With the presence of the monolayer graphene, a change in the resonance strength of the multipolar plasmonic modes results from the near field interactions of the monolayer graphene with the electric fields of the multipolar plasmonic resonances of the Al resonator. In particular, a clear absorption peak with a high quality (Q)-factor of 27 of the plasmonic third-order mode (l = 3) is realized in the graphene–Al nanoribbon structure. The sensitivity and figure of merit of the plasmonic third-order mode of the proposed Graphene–Al nanoribbon structure can reach 25 nm/RIU and 3, respectively, providing potential applications in optical refractive-index sensing.
Highlights
Aluminum plasmonics is a rapidly growing field of nanoscience due to interest in both its scientific research and its promising potential applications [1,2,3,4]
We demonstrate the multipolar plasmonic resonances of Al nanoribbon structure tuned by utilizing a monolayer graphene in UV and visible regime
The monolayer graphene is inserted into the Al2 O3 substrate to avoid the contact and carrier transport between Al nanoribbon (AlNR) and graphene
Summary
Aluminum plasmonics is a rapidly growing field of nanoscience due to interest in both its scientific research and its promising potential applications [1,2,3,4]. The research on LSPRs of Al nanostructures has mainly been focused on the fundamental electric or magnetic dipole modes [2,7,8,9,22,23,24]. These fundamental resonant modes of Al nanostructures with poor Q-factor suffer from both strong radiative and non-radiative losses in UV and visible range [25]. Multipolar plasmonic high-order resonance modes [2,26,27] of Al nanoantennas with high
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