Controlling optical responses through local dielectric resonance in nanometre metallic clusters |
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Authors: | Chen Liang-Liang Gu Ying Wang Li-Jin and Gong Qi-Huang |
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Institution: | State Key Laboratory for Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, China |
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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
\varepsilon1 and \varepsilon2. Through varying the
difference admittance ratio \eta = (\varepsilon2- \varepsilon
0) / (\varepsilon1- \varepsilon0)], 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 \varepsilone= \varepsilon0
\bigl(1 + \sumn=1^{ns} (\gamman2+ \eta \gamman2)/({\varepsilon0(s - sn))]} \bigr), and the sum
rule of cross sections: \sumn=1^{ns} {(\gamman2+
\eta \gamman2 ) = Nh1+ Nh2, where Nh1and
Nh2 are the numbers of \varepsilon1 and \varepsilon2
bonds along the electric field, respectively. These results may be
beneficial to the study of surface plasmon resonances on a nanometre
scale. |
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Keywords: | local dielectric resonance effective linear optical response nanometre metallic cluster |
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