期刊
NANOSCALE
卷 6, 期 23, 页码 14244-14253出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4nr04433a
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资金
- National Natural Science Foundation of China [21271181, 21473240]
- Ministry of Science and Technology of the People's Republic of China (Inter-governmental S&T Cooperation Project) [2013-83-6-10]
- Thousand Youth Talent Program of China
Circular dichroism (CD) studies on single nanostructures can yield novel insights into chiroptical physics that are not available from traditional ensemble-based measurements, yet they are challenging because of their weak signals. By introducing an oblique excitation beam, we demonstrate the observation and spectroscopic analysis of a prominent plasmonic chiroptical response from a single v-shaped gold nanorod dimer nanostructure. We show that circular differential scattering from the obliquely excited gold nanorod dimer yields a characteristic bisignate peak-dip spectral shape at hybridized energies of the dimer. This chiroptical response can be ascribed to extrinsic chirality which depends on the geometry configurations of the chiral arrangement. Due to strong near-field coupling, the dipole orientations of the hybridized resonance modes can be in favor of the incident circularly polarized light where a maximum g-factor of similar to 0.4 is observed. Promising applications of this chiroptical arrangement as a key component can be in electronics, photonics, or metamaterials.
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