期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 126, 期 15, 页码 6668-6677出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.2c01214
关键词
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资金
- National Research Foundation (NRF) of Korea [NRF-2018R1A2B3001049]
- Science Research Center (SRC) - NRF [NRF-2017R1A5A105365]
- Korea Basic Science Institute (National Research Facilities and Equipment Center) - Ministry of Education [NRF-2020R1A6C101B194]
- Penn Laboratory for Research in Structure of Matter (LRSM) by the National Science Foundation NSF MRSEC grant [DMR1720530]
- Department of Chemistry of University of Pennsylvania
The study focuses on the impact of mismatch in strength and energy of surface plasmon resonance (SPR) on global magnetic resonance modes in nanobead assemblies of different sizes or materials. Results show that in binary metamolecules (BMMs) composed of different sized gold beads, small beads enhance overall plasmon coupling, while in BMMs made of gold and silver beads of the same size, coupling significantly affects magnetic resonance modes. These findings provide valuable guidelines for the fabrication of colloidal metamolecules with desired metamaterial properties.
Here, we fabricated spherical assemblies of metal nanobeadswith size or material heterogeneity to study how the mismatch in the strengthand energy of surface plasmon resonance (SPR) of nanobead building blocksaffects the global magnetic resonance modes. In binary metamolecules(BMMs) composed of 15 and 45 nm Au beads, small 15 nm beads can act asthe medium between sparsely placed large nanobeads and enhance the overallplasmon coupling, resulting in a strong and narrow magnetic dipoleresonance. In BMMs made of Au and Ag nanobeads of the same size, thecoupling between Au and Ag nanobeads significantly contributes to themagnetic resonance modes, affecting both their strength and position, while itdoes not significantly affect electric modes. These results provide valuableguidelines for the fabrication of colloidal metamolecules with desiredmetamaterial properties
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