Plasmonic resonances in ordered and disordered aluminum nanocavities arrays.

8th International Congress of Engineering Physics

物理学;工业技术

Campuzano, R.G.^1 ; Mendoza, D.^1

Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Coyoacán, Ciudad de

04510, Mexico^1

关键词: Electro-chemical anodization;    Observation angle;    Optical reflectivity;    Plasmonic modes;    Plasmonic properties;    Plasmonic resonances;    Specular reflectivity;    Theoretical modeling;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/792/1/012077/pdf
DOI  :  10.1088/1742-6596/792/1/012077

学科分类：工业工程学

来源: IOP

【 摘 要 】

Nanocavities arrays were synthesized by electrochemical anodization of aluminum using oxalic and phosphoric acids as electrolytes. The morphology and topography of these structures were evaluated by SEM and AFM. Plasmonic properties of Al cavities arrays with different ordering and dimensions were analysed based on specular reflectivity. Al cavities arrays fabricated with phosphoric acid dramatically reduced the optical reflectivity as compared with unstructured Al. At the same time pronounced reflectivity dips were detectable in the 300nm-400nm range, which were ascribed to (0,1) plasmonic mode, and also a colored appearance in the samples is noticeably depending on the observation angle. These changes are not observed in samples made with oxalic acid and this fact was explained, based on a theoretical model, in terms that the surface plasmons are excited far in the UV range.