plasmonic modes and optical properties of gold and silver ellipsoidal nanoparticles by the discrete dipole approximation
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ID: 245766
2012
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Abstract
The discrete dipole approximation (DDA) is used to model the absorption efficiency of isolated gold (Au) and silver (Ag) ellipsoidal nanoparticles. The characteristics of the plasmonic bands of those nanostructures depend strongly on the size and orientation of the particles in both the lab and target frames. At specific rotation and incident angles, the desired plasmonic mode can be excited. The result of the simulation shows the possibility of excitation of three plasmonic modes—one longitudinal mode (LM) and two transverse modes (TM)—corresponding to the redistribution of the polarization charges along each principal axis. At oblique incidence of the incoming light, both the Au LM and a hybrid Au TM are observed whereas three more distinct plasmonic modes can be found in the case of the Ag particle. The effect of length distribution on the characteristics of the plasmonic bands is also examined for the three principal axes. The band position of the plasmonic bands associated with the electronic oscillation along each principal axis is found to vary linearly with the axis length. The linear variation of the band position of the LM is steeper as compared with the one found for the other modes.
| Reference Key |
alsawafta2012journalplasmonic
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|---|---|
| Authors | ;Mohammed Alsawafta;Mamoun Wahbeh;Vo-Van Truong |
| Journal | reproductive biology and endocrinology |
| Year | 2012 |
| DOI |
10.1155/2012/457968
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| URL | |
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