Plasmonic Biosensing with Aluminum Thin Films under the Kretschmann Configuration.

ABSTRACT: Aluminum has recently attracted considerable interest as a plasmonic material due to its unique optical properties, but most work has been limited to nanostructures. We report here SPR biosensing with aluminum thin-films using the standard Kretschmann configuration that has previously been dominated by gold films. Electron-beam physical vapor deposition (EBPVD)-prepared Al films oxidize in air to form a nanofilm of Al₂O_3, yielding robust stability for sensing applications in buffered solutions. FDTD simulations revealed a sharp plasmonic dip in the visible range that enables measurement of both angular shift and reflection intensity change at a fixed angle. Bulk and surface tests indicated that Al films exhibited superb sensitivity performance in both categories. Comp

SUBMITTER: Lambert AS 

PROVIDER: S-EPMC8371922 | biostudies-literature | 2020 Jul

REPOSITORIES: biostudies-literature