期刊
NANO LETTERS
卷 11, 期 4, 页码 1819-1825出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl200585b
关键词
Nanostructures; plasmon; multipole; quadrupole; octupole; Fano
类别
资金
- University of California
- MSD
- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-AC02-05CH11231]
Quadrupole plasmon and (octupolar) Fano resonances are induced in lithographically fabricated theta-shaped ring rod gold nanostructures. The optical response is characterized by measuring the light scattered by individual nanostructures. When the nanorod is brought within 3 nm of the ring wall, a weak quadrupolar resonance is observed due to capacitive coupling, and when a necklike conductive bridge links the nanorod to the nanoring the optical response changes dramatically bringing the quadrupolar resonance into prominence and creating an octupolar Fano resonance. The Fano resonance is observed due to the destructive interference of the octupolar resonance with the overlapping and broadened dipolar resonance. The quadrupolar and Fano resonances are further enhanced by capacitive coupling (near-field interaction) that is favored by the theta-shaped arrangement. The interpretation of the data is supported by FDTD simulation.
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