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Chinese Physics, 2007, Vol. 16(1): 249-257    DOI: 10.1088/1009-1963/16/1/043
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

Controlling optical responses through local dielectric resonance in nanometre metallic clusters

Chen Liang-Liang(陈亮亮), Gu Ying(古英), Wang Li-Jin(王立金), and Gong Qi-Huang(龚旗煌)
State Key Laboratory for Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, China
Abstract  Optical responses in dilute composites are controlled through the local dielectric resonance of metallic clusters. We consider two located metallic clusters close to each other with admittances $\varepsilon$1 and $\varepsilon$2. Through varying the difference admittance ratio $\eta [ = (\varepsilon _2 - \varepsilon_0 ) / (\varepsilon _1 - \varepsilon _0 )]$, we find that their optical responses are determined by the local resonance. There is a blueshift of absorption peaks with the increase of $\eta$. Simultaneously, it is known that the absorption peaks will be redshifted by enlarging the cluster size. By adjusting the nano-metallic cluster geometry, size and admittances, we can control the positions and intensities of absorption peaks effectively. We have also deduced the effective linear optical responses of three-component composites $\varepsilon _{\rm e} = \varepsilon _0\bigl(1 + \sum_{n = 1}^{n_{\rm s} } [({{\gamma _{n_1 } + \eta \gamma_{n_2 } })/({\varepsilon _0 (s - s_{n} )})]} \bigr)$, and the sum rule of cross sections: $\sum_{n = 1}^{n_{\rm s} } {(\gamma _{n_1 } +\eta \gamma _{n_2 } ) = N_{h_1 } + N_{h_2 } } $, where $N_{h_1}$ and $N_{h_2}$ are the numbers of $\varepsilon _1 $ and $\varepsilon _2$ bonds along the electric field, respectively. These results may be beneficial to the study of surface plasmon resonances on a nanometre scale.
Keywords:  local dielectric resonance      effective linear optical response      nanometre metallic cluster  
Received:  02 June 2006      Revised:  02 August 2006      Accepted manuscript online: 
PACS:  61.46.Bc (Structure of clusters (e.g., metcars; not fragments of crystals; free or loosely aggregated or loosely attached to a substrate))  
  73.22.-f (Electronic structure of nanoscale materials and related systems)  
  78.67.-n (Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures)  
Fund: Project supported by the National Natural Science Foundation of China(Grant Nos 10304001, 10334010, 10521002, 10434020, 10328407 and 90501007).

Cite this article: 

Chen Liang-Liang(陈亮亮), Gu Ying(古英), Wang Li-Jin(王立金), and Gong Qi-Huang(龚旗煌) Controlling optical responses through local dielectric resonance in nanometre metallic clusters 2007 Chinese Physics 16 249

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