Abstract
Here, we fabricated spherical assemblies of metal nanobeads with size or material heterogeneity to study how the mismatch in the strength and energy of surface plasmon resonance (SPR) of nanobead building blocks affects the global magnetic resonance modes. In binary metamolecules (BMMs) composed of 15 and 45 nm Au beads, small 15 nm beads can act as the medium between sparsely placed large nanobeads and enhance the overall plasmon coupling, resulting in a strong and narrow magnetic dipole resonance. In BMMs made of Au and Ag nanobeads of the same size, the coupling between Au and Ag nanobeads significantly contributes to the magnetic resonance modes, affecting both their strength and position, while it does not significantly affect electric modes. These results provide valuable guidelines for the fabrication of colloidal metamolecules with desired metamaterial properties.
| Original language | English |
|---|---|
| Pages (from-to) | 6668-6677 |
| Number of pages | 10 |
| Journal | Journal of Physical Chemistry C |
| Volume | 126 |
| Issue number | 15 |
| DOIs | |
| State | Published - 21 Apr 2022 |
Bibliographical note
Funding Information:S.-J.P. acknowledges financial support from the National Research Foundation (NRF) of Korea (NRF-2018R1A2B3001049) and the Science Research Center (SRC) funded by the NRF (NRF-2017R1A5A105365). Electron microscope imaging was carried out with support from a Korea Basic Science Institute (National Research Facilities and Equipment Center) grant funded by the Ministry of Education (NRF-2020R1A6C101B194). Z.F. and O.I. acknowledge partial funding from the Penn Laboratory for Research in Structure of Matter (LRSM) funded by the National Science Foundation NSF MRSEC grant (DMR-1720530) and the Department of Chemistry of University of Pennsylvania (summer fellowship for O.I.).
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© 2022 American Chemical Society.