Aluminium-Based Plasmonic Sensors in Ultraviolet

Abstract

We theoretically investigate the surface plasmon polaritons (SPPs) generated on an Al film covered by an Al2O3 layer in the context of their application as refractive index sensors. The calculated reflection spectra indicate SPP resonance excited by ultraviolet light, which was affected by the thickness of both the metal and the oxide layers on the surface. With optimized geometry, the system can work as a tunable sensor with a wide UV wavelength range λ∼ 150–300 nm. We report a quality factor of up to 10 and a figure of merit on the order of 9, and these are comparable to the performance of more complicated UV plasmonic nanostructures and allow for the detection of a 1% change of the refraction index. The sensor can operate on the basis of either the incidence angle or wavelength changes. The effect of oxide surface roughness is also investigated with an emphasis on amplitude-based refraction index sensing.

Porous aluminum decorated with rhodium nanoparticles: preparation and use as a platform for UV SERS

“…32,36,40,41 The spectrum shows similarities but also differs slightly from spectra of adenine that were observed for adenine films on other Al substrates that did not contain Rh nanostructures. 16 Considering the small amount of analyte in the few-nm layer that is deposited, the porous aluminum substrate could serve as an efficient optical substrate that can carry small analyte amounts at its enlarged surface, and more importantly, could provide optimal plasmonic properties for potential SERS enhancement 38,[42][43][44][45][46] as well. In order to investigate the influence of the presence of the rhodium nanostructures (Fig.…”

“…Considering the small amount of analyte in the few-nm layer that is deposited, the porous aluminum substrate could serve as an efficient optical substrate that can carry small analyte amounts at its enlarged surface, and more importantly, could provide optimal plasmonic properties for potential SERS enhancement 38,42–46 as well. In order to investigate the influence of the presence of the rhodium nanostructures (Fig.…”

Investigation of a highly-sensitive aluminum-based plasmonic device using antimonene for sensing applications

“…In the Kretschmann configuration, Aluminum (Al) is used as the plasmonic metal, with various 2D materials, and an angular interrogation technique is utilized to excite the surface plasmons. The Drude Lorentz model is used to compute the dielectric constant for Al metal at 1550 nm [12] shown in equation (1):…”