Shape and size effects in the optical properties of metallic nanorods

Kooij, E. Stefan and Poelsema, Bene (2006) Shape and size effects in the optical properties of metallic nanorods. PCCP: Physical Chemistry Chemical Physics, 8 . pp. 3349-3357. ISSN 1463-9076

PDF
Restricted to UT campus only: Request a copy
688Kb

Abstract:	The influence of size and geometrical shape on the optical properties of randomly oriented metallic nanorods is investigated using the discrete dipole approximation (DDA). Our calculations provide a benchmark for an accurate characterisation of nanorod suspensions by frequently used optical spectroscopic techniques. Our DDA results confirm the longitudinal plasmon resonance to be primarily affected by the nanorod aspect ratio, and also verify that the quasi-static (dipole) approximation for ellipsoidal particles is only valid for very small sizes. For prolate ellipsoidal and cylindrical nanorods with an identical aspect ratio, the latter exhibit a longitudinal resonance at significantly longer wavelengths. The importance of phase retardation and multipole contributions for larger nanorod dimensions is discussed. Also, we investigate the influence on the optical spectra of electron surface scattering, which arises from the limited size of the nanorods in comparison to the electron mean free path.
Item Type:	Article
Copyright:	© Royal Society of Chemistry
Faculty:	Science and Technology (TNW)
Research Group:	Physics of Interfaces and Nanomaterials (PIN)
Link to this item:	http://purl.utwente.nl/publications/74318
Official URL:	http://dx.doi.org/10.1039/B518389H
Export this item as:	BibTeX EndNote HTML Citation Reference Manager

Show download statistics for this publication

Repository Staff Only: item control page

Metis ID: 232775