期刊
ACS NANO
卷 4, 期 2, 页码 819-832出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn9017312
关键词
dinner; Fano resonance; diode effect; plasmon hybridization; electrostatic self-assembly
类别
资金
- Center for Advanced Solar Photophysics
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences
- DoD NSSEFF
- Air Force Office of Scientific Research [F49620-03-C-0068]
- Robert A. Welch Foundation [C-1220, C1222]
- Multidisciplinary University Research Initiative (MURI) [W911NF-04-01-0203]
- NSF
- Shared University Grid at Rice (SUG@R)
Heterodimers-two closely adjacent metallic nanoparticles differing in size or shap-exemplify a simple nanoscale geometry that gives rise to a remarkably rich set of properties. These include Fano resonances, avoided crossing behavior, and a surprising dependence of the scattering spectrum on the direction of excitation, known as the optical nanodiode effect. In a series of studies, we experimentally probe and theoretically analyze these properties in heterodimer nanostructures, where nanoparticle size and plasmon resonance frequency are varied systematically. Polarization-dependent dark-field microspectroscopy on individual heterodimer structures fabricated using a novel electromigration assembly method allows us to examine these properties in detail. These studies expand our understanding of the range of physical effects that can be observed in adjacent metallic nanoparticle pairs.
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