標題: Optical Characterization of Gold Nanoblock Dimers: From Capacitive Coupling to Charge Transfer Plasmons and Rod Modes
作者: Su, Man-Nung
Sun, Quan
Ueno, Kosei
Chang, Wei-Shun
Misawa, Hiroaki
Link, Stephan
應用化學系
Department of Applied Chemistry
公開日期: 9-八月-2018
摘要: The optical properties of plasmonic dimers consisting of two adjacent metal nanoparticles can be tuned over a broad spectral range by changing only slightly the dimer geometry. Most drastic are the changes in the smallest interparticles distances, and often only optical spectroscopy together with electromagnetic simulations yields insights into the geometry of the junction. Here, we study the coupling of gold nanoblock dimers, two square nanoantennas with different nanogaps between their closest corners. We identify three different coupling regimes-capacitively coupled, conductively bridged, and fused dimers-and optically characterize the transitions between them. By combining sample array fabrication, single-particle hyperspectral measurements, and electromagnetic simulations, we were able to examine in detail the effects of junction geometry on the resonance energy and intensity of the plasmon modes supported by gold nanoblock dimers.
URI: http://dx.doi.org/10.1021/acs.jpcc.8b05755
http://hdl.handle.net/11536/148000
ISSN: 1932-7447
DOI: 10.1021/acs.jpcc.8b05755
期刊: JOURNAL OF PHYSICAL CHEMISTRY C
Volume: 122
起始頁: 18005
結束頁: 18011
顯示於類別:期刊論文