Sectional area-dependent plasmonic shifting in the truncated process of silver nanoparticles: from cube to octahedron |
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Authors: | Lin Yuan Jian Zhu Yingjuan Ren Shenwei Bai |
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Institution: | (1) The Key Laboratory of Biomedical Information Engineering of Ministry of Education, School of Life Science and Technology, Xi’an Jiaotong University, Xi’an, 710049, China;(2) Department of Optical Information Science and Technology, School of Science, Xi’an Jiaotong University, Xi’an, 710049, China; |
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Abstract: | A silver nanocube with sub-40 nm edge length was truncated by {111} planes and transformed into octahedron gradually. The
extinction cross-section spectra corresponding to this process were studied by using the discrete dipole approximation (DDA)
method. Non-monotonous shifting (blue shifts first and then red shifts) of the surface plasmon resonance (SPR) bands was observed.
It was found that the sectional area of {111} facets could be a new and better factor to characterize the shape-dependent
non-monotonous shifting of the SPR. The area of {111} facet increases while the SPR peak red shifts, whereas decreases while
the SPR peak blue shifts. Similar results were also observed while an octahedron has been truncated into a smaller cube. The
physical mechanism was illuminated by analyzing the local field distribution of the nanoparticles with different truncated
ratios. The distance of the charge center was one of the most important reasons to affect the shift of SPR as the sectional
area of {111} facet is changed. We believe the sectional area factor could be widely used to investigate the SPR shifting
in other kinds of truncated process. |
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