Deep-Ultraviolet–Blue-Light Surface Plasmon Resonance of Al and Alcore/Al2O3shell in Spherical and Cylindrical Nanostructures

• Published in: Journal of physical chemistry. C 2012-07, Vol.116 (29), p.15584-15590
• Main Authors: Hu, Jinlian, Chen, Lu, Lian, Zichao, Cao, Min, Li, Haijin, Sun, Wenbin, Tong, Niuliu, Zeng, Haibo
• Format: Article
• Language: English
• Subjects: Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Materials science; Nanoscale materials and structures: fabrication and characterization; Other topics in nanoscale materials and structures; Physics
• ISSN: 1932-7447; 1932-7455
• DOI: 10.1021/jp305844g

The surface plasmon resonance (SPR) properties in the deep-ultraviolet (UV) to blue-light region of Al and Alcore/Al2O3shell in spherical and cylindrical nanostructures have been investigated using the discrete dipole approximation method. Simulation results show that the extremely short resonance wavelength of the Al nanostructures means the SPR is highly sensitive to the particle size and results in significant phase retardation and multipole resonance. Cylindrical Al nanoparticles show multipole resonance peaks with extremely strong intensity and narrow widths that are blue-shifted and then red-shifted with an increase in the cylinder length. An expression of the SPR peak wavelength, λmax, is derived and related to the peak shift. Cylindrical Alcore/Al2O3shell nanostructures are shown to modulate the SPR through changes to the aspect ratio and Al2O3 shell thickness. The results will assist greatly in modulating or optimizing SPR in the deep-UV to blue-light region for multimode optical filter, enhanced spectroscopy, optical lithography, and waveguide applications.