Share Email Print

Proceedings Paper

Tuning the optical properties by engineering the topologic shape of Ag nanorods
Author(s): Z.-Y. Zhang; Y.-P. Zhao
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

We use the discrete dipole approximation (DDA) method to investigate the optical extinction spectra and the E-field enhancement distribution of Ag nanorods with different topologic shapes, such as cylindrical-, needle-, period-, L-, parallel-, U-shaped, and helical nanorod structures. Compared to Ag nanorods with a simple shape such as cylinder and needle, irregular nanorod structures show many distinct plasmon resonance modes over a large spectral range. More hot spots are observed for nanorods with more kinks and bendings, such as period-shaped and L-shaped nanorods, and the E-field distribution depends on the polarization and propagation direction of the excitation light. For the parallel-nanorod structure, when the incident E-field is perpendicular to the nanorod axis, only transverse plasmon modes are excited. However, for a U-shaped nanorod, longitudinal plasmon modes can also be stimulated along the vertical nanorod direction. Helical nanorod interacts differently with left- and right-handed circular polarized lights, which provides another way to tune the plasmon peak and arrange the E-field distribution.

Paper Details

Date Published: 26 August 2008
PDF: 9 pages
Proc. SPIE 7032, Plasmonics: Metallic Nanostructures and Their Optical Properties VI, 703207 (26 August 2008); doi: 10.1117/12.793170
Show Author Affiliations
Z.-Y. Zhang, Univ. of Georgia (United States)
Y.-P. Zhao, Univ. of Georgia (United States)

Published in SPIE Proceedings Vol. 7032:
Plasmonics: Metallic Nanostructures and Their Optical Properties VI
Mark I. Stockman, Editor(s)

© SPIE. Terms of Use
Back to Top