26 August 2008 Tuning the optical properties by engineering the topologic shape of Ag nanorods
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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.
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Z.-Y. Zhang, Z.-Y. Zhang, Y.-P. Zhao, Y.-P. Zhao, } "Tuning the optical properties by engineering the topologic shape of Ag nanorods", Proc. SPIE 7032, Plasmonics: Metallic Nanostructures and Their Optical Properties VI, 703207 (26 August 2008); doi: 10.1117/12.793170; https://doi.org/10.1117/12.793170
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