Nano Archive

Localized surface plasmon resonances in aluminum nanodisks

Langhammer, Christoph and Schwind, Markus and Kasemo, Bengt and Zoric, Igor (2008) Localized surface plasmon resonances in aluminum nanodisks. NANO LETTERS, 8 (5). pp. 1461-1471.

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Official URL: http://dx.doi.org/10.1021/nl080453i

Abstract

The plasmonic properties of arrays of supported Al nanodisks, fabricated by hole-mask colloidal lithography (HCL), are analyzed for the disk diameter range 61-492 nm at a constant disk height of 20 nm. Strong and well-defined (UV-vis-NIR) localized surface plasmon resonances are found and experimentally characterized with respect to spectral peak positions, peak widths, total cross sections, and radiative and nonradiative decay channels. Theoretically, the plasmon excitations are described by electrostatic spheroid theory. Very good qualitative and quantitative agreement between model and experiment is found for all these observables by assuming a nanoparticle embedded in a few nanometer thick homogeneous (native) aluminum oxide shell. Other addressed aspects are: (i) the role of the strong interband transition in Al metal, located at 1.5 eV, for the plasmonic excitations of Al nanoparticles, (ii) the role of the native oxide layer, and (iii) the possibility of using the plasmon excitation as an ultrasensitive, remote, real-time probe for studies of oxidation/corrosion kinetics in metal nanoparticle systems.

Item Type:Article
Subjects:Physical Science > Nanophysics
Material Science > Nanofabrication processes and tools
Physical Science > Nano objects
Analytical Science > Beam methods
ID Code:2345
Deposited By:Anuj Seth
Deposited On:18 Dec 2008 11:14
Last Modified:20 Jan 2009 10:38

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