Cavity-Induced NIR Tunability in Optical Response and Energy Confinement of Dumbbell-Shaped Au Nanorod
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- 作者：Xi-bin Xu ; Jiang-shan Luo ; Miao Liu ; Yu-ying Wang ; Zao Yi ; Xi-bo Li…
- 关键词：Dumbbell ; shaped Au nanorod ; Cavity ; Surface plasmon ; Energy confinement ; NIR tunability
- 刊名：Plasmonics
- 出版年：2015
- 出版时间：April 2015
- 年：2015
- 卷：10
- 期：2
- 页码：369-381
- 全文大小：11,172 KB
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- 刊物主题：Chemistry
Biotechnology
Nanotechnology
Biophysics and Biomedical Physics
Biochemistry - 出版者：Springer US
- ISSN：1557-1963
文摘
Gold nanorod has been shown to exhibit two distinct plasmon resonances in extinction spectra, a transverse mode and a longitudinal mode, which can be tuned by changing the aspect ratio of length and width. What will happen when a nanorod with a constant aspect ratio compounds with semispheres? A theoretical model that combines gold nanorod and semispheres constructing a dumbbell-shaped nanorod is performed in this paper. We report a detailed theoretical investigation on how the nanostructures with a cavity based on gold nanorods can tune the optical properties and enhance localized field. The results show that the topography of the nanorods provides other degrees of freedom to tune the optical properties. Indeed, when the direction of incident light is along the x-axis, the resonance frequency and spectral width of longitudinal modes can be tuned in a wide wavelength range by varying the radius of semisphere-suspended heads. The resonance modes in the infrared zone can be significantly tuned up to 800?nm by varying the radius of semispheres. Also, the field distribution of the dumbbell-shaped nanorod can be significantly changed by plasmon excitement of semisphere-suspended heads. Field amplification up to four orders of magnitude can be obtained, which can provide a new path to tune the optical response of the nanorod and will have wide applications in localized surface plasmon resonance (LSPR)-based biosensing and intracellular imaging and photothermal therapy.