Tunable Fano Resonances in Three-Layered Bimetallic Au and Ag Nanoshell
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- 作者：DaJian Wu ; ShuMin Jiang ; XiaoJun Liu
- 刊名：Journal of Physical Chemistry C
- 出版年：2011
- 出版时间：December 8, 2011
- 年：2011
- 卷：115
- 期：48
- 页码：23797-23801
- 全文大小：790K
- 年卷期：v.115,no.48(December 8, 2011)
- ISSN：1932-7455
文摘
The plasmon coupling in a three-layered Au/SiO2/Ag nanoshell has been investigated by means of Mie scattering theory. The dipole鈥揹ipole and dipole鈥搎uadrupole Fano resonances have been observed in the extinction spectra of Au/SiO2/Ag nanoshells. With increase of the thickness of the middle layer, the dipole鈥揹ipole Fano resonance shows a blue shift and the magnitude of this Fano profile enhances while the dipole鈥搎uadrupole Fano resonance shows a red shift and reduces. With increase of the thickness of the outer shell, the dipole鈥揹ipole Fano minimum shows a blue shift and its magnitude decreases while both the energy and magnitude of dipole鈥搎uadrupole Fano resonance increase. All of the behaviors have been discussed with the plasmon hybridization model. In addition, the Au/SiO2/Ag nanoshell is found to show strong near-field enhancements in several regions, especially in the infrared region, which may provide effective applications in surface enhanced spectroscopy.